Oracle查询dba_extents视图很慢
Oracle查询dba_extents视图很慢
问题描述
下边这条SQL查询每次大概要花1分钟左右，实在是比较异常。
select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name;
测试分析
先实际跑完一遍，去详细的执行信息。
模板复制：
set pagesize 9999 long 9999 line 500
alter session set statistics_level=all;
select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name;
select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));
执行时间如下：
20:25:06 SYS@anonymous> set pagesize 9999 long 9999 line 500
20:25:15 SYS@anonymous> alter session set statistics_level=all; Session altered. Elapsed: 00:00:00.00
20:26:33 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME
------------------------------ ------------------------------
SYS SYSTEM Elapsed: 00:01:01.87
获取执行计划：
20:27:48 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID dggb0d96bj8dy, child number 4
-------------------------------------
select owner,tablespace_name from dba_extents where segment_name='AUD$'
group by owner,tablespace_name Plan hash value: 1482657742 ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 1 |00:01:01.87 | 190K| 7157 | | | |
| 1 | HASH GROUP BY | | 1 | 543K| 1 |00:01:01.87 | 190K| 7157 | 2331K| 2194K| 435K (0)|
| 2 | VIEW | DBA_EXTENTS | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | | | |
| 3 | UNION-ALL | | 1 | | 259 |00:01:01.87 | 190K| 7157 | | | |
| 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
|* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | |
| 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | |
|* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | 0 | | | |
| 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 24 | VIEW | SYS_OBJECTS | 0 | 5 | 0 |00:00:00.01 | 0 | 0 | | | |
| 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | 0 | | | |
|* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 69 | HASH JOIN | | 1 | 543K| 259 |00:01:01.87 | 190K| 7157 | 1214K| 1214K| 709K (0)|
|* 70 | HASH JOIN | | 1 | 20549 | 1 |00:00:00.33 | 138K| 0 | 1969K| 1969K| 1531K (0)|
| 71 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | 0 | | | |
| 72 | VIEW | SYS_DBA_SEGS | 1 | 6785 | 1 |00:00:00.33 | 138K| 0 | | | |
| 73 | UNION-ALL | | 1 | | 1 |00:00:00.33 | 138K| 0 | | | |
| 74 | NESTED LOOPS | | 1 | 6783 | 1 |00:00:00.32 | 137K| 0 | | | |
| 75 | NESTED LOOPS OUTER | | 1 | 2 | 10578 |00:00:00.10 | 21543 | 0 | | | |
| 76 | MERGE JOIN CARTESIAN | | 1 | 2 | 10578 |00:00:00.07 | 10961 | 0 | | | |
| 77 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.06 | 10896 | 0 | | | |
| 78 | NESTED LOOPS | | 1 | 1 | 10578 |00:00:00.03 | 314 | 0 | | | |
|* 79 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 10578 |00:00:00.02 | 310 | 0 | | | |
|* 80 | INDEX UNIQUE SCAN | I_FILE2 | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
| 81 | TABLE ACCESS CLUSTER | TS$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | |
|* 82 | INDEX UNIQUE SCAN | I_TS# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
| 83 | BUFFER SORT | | 10578 | 2 | 10578 |00:00:00.01 | 65 | 0 | 2048 | 2048 | 2048 (0)|
|* 84 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | 0 | | | |
| 85 | TABLE ACCESS CLUSTER | USER$ | 10578 | 1 | 10578 |00:00:00.02 | 10582 | 0 | | | |
|* 86 | INDEX UNIQUE SCAN | I_USER# | 10578 | 1 | 10578 |00:00:00.01 | 4 | 0 | | | |
|* 87 | VIEW | SYS_OBJECTS | 10578 | 2 | 1 |00:00:00.22 | 116K| 0 | | | |
| 88 | UNION ALL PUSHED PREDICATE | | 10578 | | 10578 |00:00:00.21 | 116K| 0 | | | |
|* 89 | TABLE ACCESS CLUSTER | TAB$ | 10578 | 1 | 10578 |00:00:00.03 | 21161 | 0 | | | |
|* 90 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | |
| 91 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|* 92 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 93 | TABLE ACCESS CLUSTER | CLU$ | 10578 | 1 | 0 |00:00:00.02 | 21161 | 0 | | | |
|* 94 | INDEX UNIQUE SCAN | I_OBJ# | 10578 | 1 | 10578 |00:00:00.01 | 10583 | 0 | | | |
|* 95 | TABLE ACCESS BY INDEX ROWID | IND$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|* 96 | INDEX UNIQUE SCAN | I_IND1 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 97 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|* 98 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|* 99 | TABLE ACCESS BY INDEX ROWID | LOB$ | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
|*100 | INDEX UNIQUE SCAN | I_LOB2 | 10578 | 1 | 0 |00:00:00.01 | 10583 | 0 | | | |
| 101 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*102 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 103 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*104 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 105 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
|*106 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 10578 | 1 | 0 |00:00:00.01 | 10578 | 0 | | | |
| 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
| 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*111 | TABLE ACCESS BY INDEX ROWID| UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | 0 | | | |
|*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
|*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | 0 | | | |
| 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 131 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:01.20 | 52350 | 7157 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#")
15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
17 - access("TS"."TS#"="E"."TS#")
18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#"))
21 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
23 - access("O"."OWNER#"="U"."USER#")
24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0))
27 - access("T"."OBJ#"="O"."OBJ#")
28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#"))
29 - access("TP"."OBJ#"="O"."OBJ#")
30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#"))
31 - access("C"."OBJ#"="O"."OBJ#")
32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#")))
33 - access("I"."OBJ#"="O"."OBJ#")
34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#"))
35 - access("IP"."OBJ#"="O"."OBJ#")
36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR
BITAND("L"."PROPERTY",128)=128)))
37 - access("L"."LOBJ#"="O"."OBJ#")
38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#"))
39 - access("TSP"."OBJ#"="O"."OBJ#")
40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#"))
41 - access("ISP"."OBJ#"="O"."OBJ#")
42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#"))
43 - access("LF"."FRAGOBJ#"="O"."OBJ#")
49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
51 - access("TS"."TS#"="E"."TS#")
52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter("S"."TS#"="TS"."TS#")
55 - access("S"."USER#"="U"."USER#")
56 - access("UN"."NAME"='AUD$')
57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND
"S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#"))
62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
64 - access("TS"."TS#"="E"."TS#")
65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND
"S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND
TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$'))
68 - access("S"."USER#"="U"."USER#")
69 - access("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID" AND
"E"."KTFBUEFNO"="F"."RELFILE#")
70 - access("DS"."TABLESPACE_ID"="F"."TS#")
79 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
80 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
82 - access("S"."TS#"="TS"."TS#")
84 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
86 - access("O"."OWNER#"="U"."USER#")
87 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
89 - filter(BITAND("T"."PROPERTY",1024)=0)
90 - access("T"."OBJ#"="O"."OBJ#")
92 - access("TP"."OBJ#"="O"."OBJ#")
94 - access("C"."OBJ#"="O"."OBJ#")
95 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR
"I"."TYPE#"=9))
96 - access("I"."OBJ#"="O"."OBJ#")
98 - access("IP"."OBJ#"="O"."OBJ#")
99 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))
100 - access("L"."LOBJ#"="O"."OBJ#")
102 - access("TSP"."OBJ#"="O"."OBJ#")
104 - access("ISP"."OBJ#"="O"."OBJ#")
106 - access("LF"."FRAGOBJ#"="O"."OBJ#")
111 - filter("UN"."STATUS$"<>1)
112 - access("UN"."NAME"='AUD$')
113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")
114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#")
117 - access("S"."TS#"="TS"."TS#")
119 - access("S"."USER#"="U"."USER#")
124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND
"S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
126 - access("S"."TS#"="TS"."TS#")
128 - access("S"."USER#"="U"."USER#")
129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$') 232 rows selected. Elapsed: 00:00:00.10
直接看id=131的那一行，时间都花在对固定表X$KTFBUE的全表扫描上，这个算是Oracle的一个BUG，当该固定表没有统计信息的时候，Oracle不会对他做动态采样，而是直接使用基数为100000的行。
查看索引的信息，固定表的索引有点奇怪：
SYS@zkm1> select * from V$INDEXED_FIXED_COLUMN where table_name='X$KTFBUE'; TABLE_NAME INDEX_NUMBER COLUMN_NAME COLUMN_POSITION
------------------------------ ------------ ------------------------------ ---------------
X$KTFBUE 1 KTFBUESEGBNO 2
X$KTFBUE 1 KTFBUESEGFNO 1
X$KTFBUE 1 KTFBUESEGTSN 0
看不出啥。
百度或者mos上都可以查找到相关的原因和办法。
mos参考文档：Query Against DBA_EXTENTS Performs Slowly After Upgrade to 11.2.0.3 (Doc ID 1453425.1)
这篇文章有提供几种方法。
Gathering stats on the X$KTFBUE table using the following command:
EXEC DBMS_STATS.GATHER_TABLE_STATS('SYS', 'X$KTFBUE');For more information on gathering fixed table statistics see:
Document 798257.1 GATHER_FIXED_OBJECTS_STATS ConsiderationsOR
alter session set "_optimizer_cartesian_enabled" = false;OR
alter session set "_smm_auto_cost_enabled" = false;OR
Disable fix for unpublished Bug Bug 11814428: POOR CARDINALITY ESTIMATE FROM JOIN WITH A UNION-ALL VIEW:
alter session set "_FIX_CONTROL" = "11814428:0";
不过只有收集统计信息和最下边的BUG修复关掉才有效。
收集统计信息这个方法略过，因为还有一个表空间查询缓慢的问题和这个是一样的问题。
我们采用另外一种方法，关闭11814428的修复，执行：
20:30:19 SYS@anonymous> alter session set "_FIX_CONTROL" = "11814428:0"; Session altered. Elapsed: 00:00:00.00
之后再次运行变快了：
20:30:21 SYS@anonymous> select owner,tablespace_name from dba_extents where segment_name='AUD$' group by owner,tablespace_name; OWNER TABLESPACE_NAME
------------------------------ ------------------------------
SYS SYSTEM Elapsed: 00:00:00.33
可以发现执行计划对X$KTFBUE已经采用了索引：
20:30:28 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID dggb0d96bj8dy, child number 5
-------------------------------------
select owner,tablespace_name from dba_extents where segment_name='AUD$'
group by owner,tablespace_name Plan hash value: 381184789 ------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 1 |00:00:00.01 | 719 | | | |
| 1 | HASH GROUP BY | | 1 | 729 | 1 |00:00:00.01 | 719 | 1646K| 1646K| 497K (0)|
| 2 | VIEW | DBA_EXTENTS | 1 | 729 | 259 |00:00:00.01 | 719 | | | |
| 3 | UNION-ALL | | 1 | | 259 |00:00:00.01 | 719 | | | |
| 4 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 5 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 6 | TABLE ACCESS FULL | UET$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
|* 7 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 8 | VIEW | SYS_DBA_SEGS | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 9 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | |
| 10 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 11 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 12 | MERGE JOIN CARTESIAN | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 13 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 14 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 15 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 16 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 17 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 18 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 19 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 20 | BUFFER SORT | | 0 | 2 | 0 |00:00:00.01 | 0 | 73728 | 73728 | |
|* 21 | INDEX SKIP SCAN | I_OBJ2 | 0 | 2 | 0 |00:00:00.01 | 0 | | | |
| 22 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 23 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 24 | VIEW | SYS_OBJECTS | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 25 | UNION ALL PUSHED PREDICATE | | 0 | | 0 |00:00:00.01 | 0 | | | |
|* 26 | TABLE ACCESS CLUSTER | TAB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 28 | TABLE ACCESS BY INDEX ROWID | TABPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 29 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 30 | TABLE ACCESS CLUSTER | CLU$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 31 | INDEX UNIQUE SCAN | I_OBJ# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 32 | TABLE ACCESS BY INDEX ROWID | IND$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 33 | INDEX UNIQUE SCAN | I_IND1 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 34 | TABLE ACCESS BY INDEX ROWID | INDPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 35 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 36 | TABLE ACCESS BY INDEX ROWID | LOB$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_LOB2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 38 | TABLE ACCESS BY INDEX ROWID | TABSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 39 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 40 | TABLE ACCESS BY INDEX ROWID | INDSUBPART$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 41 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 42 | TABLE ACCESS BY INDEX ROWID | LOBFRAG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 43 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 44 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 45 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 46 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 47 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 48 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 49 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 50 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 51 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 52 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 53 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 54 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 55 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 56 | INDEX RANGE SCAN | I_UNDO2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 57 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 58 | NESTED LOOPS OUTER | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 59 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 60 | NESTED LOOPS | | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 62 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 63 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 64 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 65 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 66 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 67 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 68 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|* 69 | HASH JOIN | | 1 | 728 | 259 |00:00:00.01 | 409 | 1969K| 1969K| 1497K (0)|
| 70 | INDEX FULL SCAN | I_FILE2 | 1 | 106 | 108 |00:00:00.01 | 1 | | | |
| 71 | NESTED LOOPS | | 1 | 24769 | 259 |00:00:00.01 | 408 | | | |
| 72 | VIEW | SYS_DBA_SEGS | 1 | 3 | 1 |00:00:00.01 | 401 | | | |
| 73 | UNION-ALL | | 1 | | 1 |00:00:00.01 | 401 | | | |
| 74 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 89 | | | |
| 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 87 | | | |
| 76 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 86 | | | |
| 77 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.01 | 83 | | | |
| 78 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 81 | | | |
|* 79 | INDEX SKIP SCAN | I_OBJ2 | 1 | 2 | 1 |00:00:00.01 | 65 | | | |
|* 80 | VIEW | SYS_OBJECTS | 1 | 1 | 1 |00:00:00.01 | 16 | | | |
| 81 | UNION ALL PUSHED PREDICATE | | 1 | | 1 |00:00:00.01 | 16 | | | |
|* 82 | TABLE ACCESS CLUSTER | TAB$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | |
|* 83 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
| 84 | TABLE ACCESS BY INDEX ROWID| TABPART$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 85 | INDEX UNIQUE SCAN | I_TABPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 86 | TABLE ACCESS CLUSTER | CLU$ | 1 | 1 | 0 |00:00:00.01 | 3 | | | |
|* 87 | INDEX UNIQUE SCAN | I_OBJ# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|* 88 | TABLE ACCESS BY INDEX ROWID| IND$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 89 | INDEX UNIQUE SCAN | I_IND1 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 90 | TABLE ACCESS BY INDEX ROWID| INDPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 91 | INDEX UNIQUE SCAN | I_INDPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 92 | TABLE ACCESS BY INDEX ROWID| LOB$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|* 93 | INDEX UNIQUE SCAN | I_LOB2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 94 | TABLE ACCESS BY INDEX ROWID| TABSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 95 | INDEX UNIQUE SCAN | I_TABSUBPART$_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 96 | TABLE ACCESS BY INDEX ROWID| INDSUBPART$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 97 | INDEX UNIQUE SCAN | I_INDSUBPART_OBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 98 | TABLE ACCESS BY INDEX ROWID| LOBFRAG$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
|* 99 | INDEX UNIQUE SCAN | I_LOBFRAG$_FRAGOBJ$ | 1 | 1 | 0 |00:00:00.01 | 1 | | | |
| 100 | TABLE ACCESS CLUSTER | USER$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*101 | INDEX UNIQUE SCAN | I_USER# | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
|*102 | TABLE ACCESS CLUSTER | SEG$ | 1 | 1 | 1 |00:00:00.01 | 3 | | | |
|*103 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*104 | INDEX UNIQUE SCAN | I_FILE2 | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
| 105 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | | | |
|*106 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | | | |
| 107 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 108 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 109 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
| 110 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*111 | TABLE ACCESS BY INDEX ROWID | UNDO$ | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*112 | INDEX RANGE SCAN | I_UNDO2 | 1 | 1 | 0 |00:00:00.01 | 2 | | | |
|*113 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*114 | TABLE ACCESS CLUSTER | SEG$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*115 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 116 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*117 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 118 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*119 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 120 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 121 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 122 | NESTED LOOPS OUTER | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 123 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
|*124 | TABLE ACCESS FULL | SEG$ | 1 | 1 | 0 |00:00:00.01 | 310 | | | |
| 125 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*126 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
| 127 | TABLE ACCESS CLUSTER | USER$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*128 | INDEX UNIQUE SCAN | I_USER# | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*129 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*130 | TABLE ACCESS BY INDEX ROWID | FILE$ | 0 | 1 | 0 |00:00:00.01 | 0 | | | |
|*131 | FIXED TABLE FIXED INDEX | X$KTFBUE (ind:1) | 1 | 8256 | 259 |00:00:00.01 | 7 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 7 - access("E"."TS#"="F"."TS#" AND "E"."FILE#"="F"."RELFILE#")
15 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
17 - access("TS"."TS#"="E"."TS#")
18 - filter((BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
19 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#"))
21 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
23 - access("O"."OWNER#"="U"."USER#")
24 - filter(("S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK" AND "S"."TS#"="SO"."TS_NUMBER" AND
"S"."TYPE#"="SO"."SEGMENT_TYPE_ID" AND "O"."TYPE#"="SO"."OBJECT_TYPE_ID"))
26 - filter(("T"."BLOCK#"="E"."SEGBLOCK#" AND "T"."FILE#"="E"."SEGFILE#" AND "T"."TS#"="E"."TS#" AND BITAND("T"."PROPERTY",1024)=0))
27 - access("T"."OBJ#"="O"."OBJ#")
28 - filter(("TP"."BLOCK#"="E"."SEGBLOCK#" AND "TP"."FILE#"="E"."SEGFILE#" AND "TP"."TS#"="E"."TS#"))
29 - access("TP"."OBJ#"="O"."OBJ#")
30 - filter(("C"."BLOCK#"="E"."SEGBLOCK#" AND "C"."FILE#"="E"."SEGFILE#" AND "C"."TS#"="E"."TS#"))
31 - access("C"."OBJ#"="O"."OBJ#")
32 - filter(("I"."BLOCK#"="E"."SEGBLOCK#" AND "I"."FILE#"="E"."SEGFILE#" AND "I"."TS#"="E"."TS#" AND INTERNAL_FUNCTION("I"."TYPE#")))
33 - access("I"."OBJ#"="O"."OBJ#")
34 - filter(("IP"."BLOCK#"="E"."SEGBLOCK#" AND "IP"."FILE#"="E"."SEGFILE#" AND "IP"."TS#"="E"."TS#"))
35 - access("IP"."OBJ#"="O"."OBJ#")
36 - filter(("L"."BLOCK#"="E"."SEGBLOCK#" AND "L"."FILE#"="E"."SEGFILE#" AND "L"."TS#"="E"."TS#" AND (BITAND("L"."PROPERTY",64)=0 OR
BITAND("L"."PROPERTY",128)=128)))
37 - access("L"."LOBJ#"="O"."OBJ#")
38 - filter(("TSP"."BLOCK#"="E"."SEGBLOCK#" AND "TSP"."FILE#"="E"."SEGFILE#" AND "TSP"."TS#"="E"."TS#"))
39 - access("TSP"."OBJ#"="O"."OBJ#")
40 - filter(("ISP"."FILE#"="E"."SEGFILE#" AND "ISP"."BLOCK#"="E"."SEGBLOCK#" AND "ISP"."TS#"="E"."TS#"))
41 - access("ISP"."OBJ#"="O"."OBJ#")
42 - filter(("LF"."BLOCK#"="E"."SEGBLOCK#" AND "LF"."FILE#"="E"."SEGFILE#" AND "LF"."TS#"="E"."TS#"))
43 - access("LF"."FRAGOBJ#"="O"."OBJ#")
49 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
51 - access("TS"."TS#"="E"."TS#")
52 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=0 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
53 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter("S"."TS#"="TS"."TS#")
55 - access("S"."USER#"="U"."USER#")
56 - access("UN"."NAME"='AUD$')
57 - filter(("UN"."BLOCK#"="E"."SEGBLOCK#" AND "UN"."FILE#"="E"."SEGFILE#" AND "UN"."TS#"="E"."TS#" AND "UN"."STATUS$"<>1 AND
"S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#" AND "S"."TS#"="UN"."TS#" AND "UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#"))
62 - access("F"."TS#"="E"."TS#" AND "F"."RELFILE#"="E"."SEGFILE#")
64 - access("TS"."TS#"="E"."TS#")
65 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=0 AND
BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
66 - access("S"."TS#"="E"."TS#" AND "S"."FILE#"="E"."SEGFILE#" AND "S"."BLOCK#"="E"."SEGBLOCK#")
filter(("S"."TS#"="TS"."TS#" AND "S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#" AND
TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$'))
68 - access("S"."USER#"="U"."USER#")
69 - access("DS"."TABLESPACE_ID"="F"."TS#" AND "E"."KTFBUEFNO"="F"."RELFILE#")
79 - access("O"."NAME"='AUD$')
filter("O"."NAME"='AUD$')
80 - filter("O"."TYPE#"="SO"."OBJECT_TYPE_ID")
82 - filter(BITAND("T"."PROPERTY",1024)=0)
83 - access("T"."OBJ#"="O"."OBJ#")
85 - access("TP"."OBJ#"="O"."OBJ#")
87 - access("C"."OBJ#"="O"."OBJ#")
88 - filter(("I"."TYPE#"=1 OR "I"."TYPE#"=2 OR "I"."TYPE#"=3 OR "I"."TYPE#"=4 OR "I"."TYPE#"=6 OR "I"."TYPE#"=7 OR "I"."TYPE#"=8 OR
"I"."TYPE#"=9))
89 - access("I"."OBJ#"="O"."OBJ#")
91 - access("IP"."OBJ#"="O"."OBJ#")
92 - filter((BITAND("L"."PROPERTY",64)=0 OR BITAND("L"."PROPERTY",128)=128))
93 - access("L"."LOBJ#"="O"."OBJ#")
95 - access("TSP"."OBJ#"="O"."OBJ#")
97 - access("ISP"."OBJ#"="O"."OBJ#")
99 - access("LF"."FRAGOBJ#"="O"."OBJ#")
101 - access("O"."OWNER#"="U"."USER#")
102 - filter((BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"="SO"."SEGMENT_TYPE_ID"))
103 - access("S"."TS#"="SO"."TS_NUMBER" AND "S"."FILE#"="SO"."HEADER_FILE" AND "S"."BLOCK#"="SO"."HEADER_BLOCK")
104 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
106 - access("S"."TS#"="TS"."TS#")
111 - filter("UN"."STATUS$"<>1)
112 - access("UN"."NAME"='AUD$')
113 - access("UN"."TS#"="F"."TS#" AND "UN"."FILE#"="F"."RELFILE#")
114 - filter((INTERNAL_FUNCTION("S"."TYPE#") AND BITAND(NVL("S"."SPARE1",0),1)=1 AND BITAND(NVL("S"."SPARE1",0),65536)=0))
115 - access("S"."TS#"="UN"."TS#" AND "S"."FILE#"="UN"."FILE#" AND "S"."BLOCK#"="UN"."BLOCK#")
117 - access("S"."TS#"="TS"."TS#")
119 - access("S"."USER#"="U"."USER#")
124 - filter(("S"."TYPE#"<>6 AND "S"."TYPE#"<>5 AND "S"."TYPE#"<>8 AND BITAND(NVL("S"."SPARE1",0),1)=1 AND
BITAND(NVL("S"."SPARE1",0),65536)=0 AND "S"."TYPE#"<>10 AND "S"."TYPE#"<>1))
126 - access("S"."TS#"="TS"."TS#")
128 - access("S"."USER#"="U"."USER#")
129 - access("S"."TS#"="F"."TS#" AND "S"."FILE#"="F"."RELFILE#")
130 - filter(TO_CHAR("F"."FILE#")||'.'||TO_CHAR("S"."BLOCK#")='AUD$')
131 - filter(("E"."KTFBUESEGFNO"="DS"."RELATIVE_FNO" AND "E"."KTFBUESEGBNO"="DS"."HEADER_BLOCK" AND "E"."KTFBUESEGTSN"="DS"."TABLESPACE_ID")) 231 rows selected. Elapsed: 00:00:00.15
在查询表空间的时候，执行alter session set "_FIX_CONTROL" = "11814428:0";后，X$KTFBUE还是走全表扫描：
（表空间名字做处理）
20:32:05 SYS@eportdbi1> SELECT a.tablespace_name,
20:32:05 2 ROUND (a.bytes_alloc / 1024 / 1024, 2) megs_alloc,
20:32:05 3 ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2) megs_free,
20:32:05 4 ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) / 1024 / 1024, 2 ) megs_used,
20:32:05 5 ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_free,
20:32:05 6 100 - ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used,
20:32:05 7 ROUND (maxbytes / 1048576, 2) MAX
20:32:05 8 FROM
20:32:05 9 (SELECT f.tablespace_name,
20:32:05 10 SUM (f.BYTES) bytes_alloc,
20:32:05 11 SUM (DECODE (f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes
20:32:05 12 FROM dba_data_files f
20:32:05 13 GROUP BY tablespace_name
20:32:05 14 ) a,
20:32:05 15 (SELECT f.tablespace_name,
20:32:05 16 SUM (f.BYTES) bytes_free
20:32:05 17 FROM dba_free_space f
20:32:05 18 GROUP BY tablespace_name
20:32:05 19 ) b
20:32:05 20 WHERE a.tablespace_name = b.tablespace_name(+)
20:32:05 21 UNION ALL
20:32:05 22 SELECT h.tablespace_name,
20:32:05 23 ROUND (SUM (h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc,
20:32:05 24 ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0)) / 1048576, 2 ) megs_free,
20:32:05 25 ROUND (SUM (NVL (p.bytes_used, 0)) / 1048576, 2) megs_used,
20:32:05 26 ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_free,
20:32:05 27 100 - ROUND ( ( SUM ( (h.bytes_free + h.bytes_used) - NVL (p.bytes_used, 0) ) / SUM (h.bytes_used + h.bytes_free) ) * 100, 2 ) pct_used,
20:32:05 28 ROUND (SUM (f.maxbytes) / 1048576, 2) MAX
20:32:05 29 FROM SYS.v_$temp_space_header h,
20:32:05 30 SYS.v_$temp_extent_pool p,
20:32:05 31 dba_temp_files f
20:32:05 32 WHERE p.file_id(+) = h.file_id
20:32:06 33 AND p.tablespace_name(+) = h.tablespace_name
20:32:06 34 AND f.file_id = h.file_id
20:32:06 35 AND f.tablespace_name = h.tablespace_name
20:32:06 36 GROUP BY h.tablespace_name
20:32:06 37 ORDER BY 1 ; TABLESPACE_NAME MEGS_ALLOC MEGS_FREE MEGS_USED PCT_FREE PCT_USED MAX
------------------------------ ---------- ---------- ---------- ---------- ---------- ----------
xxxxxxxxxxxxxxxx 4096 4019 77 98.12 1.88 4096
xxxxxxxxxxxxxxxx 8192 2283 5909 27.87 72.13 8192
xxxxxxxxxxxxxxxx 2048 1113 935 54.35 45.65 2048
xxxxxxxxxxxxxxxx 24576 16092 8484 65.48 34.52 24576
xxxxxxxxxxxxxxxx 4096 4095 1 99.98 .02 4096
xxxxxxxxxxxxxxxx 8192 8187 5 99.94 .06 8192
xxxxxxxxxxxxxxxx 4000 3373 627 84.33 15.67 4000
xxxxxxxxxxxxxxxx 546304 346561 199743 63.44 36.56 546304
xxxxxxxxxxxxxxxx 4096 2969 1127 72.49 27.51 4096
xxxxxxxxxxxxxxxx 4096 4086 10 99.76 .24 4096
xxxxxxxxxxxxxxxx 8192 3047 5145 37.19 62.81 8192
xxxxxxxxxxxxxxxx 276608 77078 199530 27.87 72.13 276608
xxxxxxxxxxxxxxxx 16384 8605 7779 52.52 47.48 16384
xxxxxxxxxxxxxxxx 4096 2944 1152 71.88 28.12 4096
xxxxxxxxxxxxxxxx 16384 3575 12809 21.82 78.18 16384
xxxxxxxxxxxxxxxx 4096 1074 3022 26.22 73.78 4096
xxxxxxxxxxxxxxxx 4096 4071 25 99.39 .61 4096
xxxxxxxxxxxxxxxx 4096 3915 181 95.58 4.42 4096
xxxxxxxxxxxxxxxx 16384 15984 400 97.56 2.44 16384
xxxxxxxxxxxxxxxx 32760 8390.88 24369.13 25.61 74.39 32767.98
xxxxxxxxxxxxxxxx 5360 34.13 5325.88 .64 99.36 32767.98
xxxxxxxxxxxxxxxx 4096 2946 1150 71.92 28.08 4096
xxxxxxxxxxxxxxxx 4096 4052 44 98.93 1.07 4096
xxxxxxxxxxxxxxxx 20096 13860 6236 68.97 31.03 20096
xxxxxxxxxxxxxxxx 16384 13068 3316 79.76 20.24 16384
xxxxxxxxxxxxxxxx 208192 40933 167259 19.66 80.34 208192
xxxxxxxxxxxxxxxx 20096 16143 3953 80.33 19.67 20096
xxxxxxxxxxxxxxxx 2048 1898 150 92.68 7.32 2048
xxxxxxxxxxxxxxxx 20096 16138 3958 80.3 19.7 20096
xxxxxxxxxxxxxxxx 68096 13300 54796 19.53 80.47 68096
xxxxxxxxxxxxxxxx 8192 8179 13 99.84 .16 8192
xxxxxxxxxxxxxxxx 32767 31971 796 97.57 2.43 32767.98
xxxxxxxxxxxxxxxx 10240 2371.75 7868.25 23.16 76.84 10240
xxxxxxxxxxxxxxxx 10390 9292.25 1097.75 89.43 10.57 32767.98
xxxxxxxxxxxxxxxx 4356.25 209.38 4146.88 4.81 95.19 32767.98 35 rows selected. Elapsed: 00:01:54.62
执行计划：
20:34:00 SYS@anonymous> select * from table(dbms_xplan.display_cursor(null,null,'allstats last')); PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
SQL_ID 8ks58zbpgra00, child number 1
-------------------------------------
SELECT a.tablespace_name, ROUND (a.bytes_alloc / 1024 /
1024, 2) megs_alloc, ROUND (NVL (b.bytes_free, 0) / 1024 / 1024, 2)
megs_free, ROUND ((a.bytes_alloc - NVL (b.bytes_free, 0)) /
1024 / 1024, 2 ) megs_used, ROUND ((NVL (b.bytes_free, 0) /
a.bytes_alloc) * 100, 2) pct_free, 100 -
ROUND ((NVL (b.bytes_free, 0) / a.bytes_alloc) * 100, 2) pct_used,
ROUND (maxbytes / 1048576, 2) MAX FROM (SELECT
f.tablespace_name, SUM (f.BYTES) bytes_alloc, SUM (DECODE
(f.autoextensible, 'YES', f.maxbytes, 'NO', f.BYTES ) ) maxbytes FROM
dba_data_files f GROUP BY tablespace_name ) a, (SELECT
f.tablespace_name, SUM (f.BYTES) bytes_free FROM dba_free_space f
GROUP BY tablespace_name ) b WHERE a.tablespace_name =
b.tablespace_name(+) UNION ALL SELECT h.tablespace_name, ROUND (SUM
(h.bytes_free + h.bytes_used) / 1048576, 2) megs_alloc,
ROUND ( SUM ((h.bytes_free + h.bytes_used) - NVL (p.b Plan hash value: 2506036241 ------------------------------------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers | Reads | OMem | 1Mem | Used-Mem |
------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | |
| 1 | SORT ORDER BY | | 1 | 3 | 35 |00:01:54.53 | 53354 | 4865 | 4096 | 4096 | 4096 (0)|
| 2 | UNION-ALL | | 1 | | 35 |00:01:54.53 | 53354 | 4865 | | | |
|* 3 | HASH JOIN OUTER | | 1 | 2 | 34 |00:01:54.18 | 53310 | 4865 | 1229K| 1229K| 1243K (0)|
| 4 | VIEW | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | | | |
| 5 | HASH GROUP BY | | 1 | 2 | 34 |00:00:00.66 | 444 | 0 | 941K| 941K| 1349K (0)|
| 6 | VIEW | DBA_DATA_FILES | 1 | 2 | 108 |00:00:00.65 | 444 | 0 | | | |
| 7 | UNION-ALL | | 1 | | 108 |00:00:00.65 | 444 | 0 | | | |
| 8 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
| 9 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
| 10 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.57 | 112 | 0 | | | |
|* 11 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.57 | 0 | 0 | | | |
|* 12 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 0 |00:00:00.01 | 112 | 0 | | | |
|* 13 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
|* 14 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 15 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 16 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 17 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 332 | 0 | | | |
| 18 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.08 | 220 | 0 | | | |
| 19 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 220 | 0 | | | |
| 20 | NESTED LOOPS | | 1 | 1 | 108 |00:00:00.01 | 108 | 0 | | | |
|* 21 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 108 |00:00:00.01 | 0 | 0 | | | |
|* 22 | FIXED TABLE FIXED INDEX | X$KTFBHC (ind:1) | 108 | 1 | 108 |00:00:00.01 | 108 | 0 | | | |
|* 23 | TABLE ACCESS BY INDEX ROWID| FILE$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | |
|* 24 | INDEX UNIQUE SCAN | I_FILE1 | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
|* 25 | FIXED TABLE FIXED INDEX | X$KCCFE (ind:1) | 108 | 1 | 108 |00:00:00.08 | 0 | 0 | | | |
| 26 | TABLE ACCESS CLUSTER | TS$ | 108 | 1 | 108 |00:00:00.01 | 112 | 0 | | | |
|* 27 | INDEX UNIQUE SCAN | I_TS# | 108 | 1 | 108 |00:00:00.01 | 4 | 0 | | | |
| 28 | VIEW | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | | | |
| 29 | HASH GROUP BY | | 1 | 31 | 34 |00:01:53.52 | 52866 | 4865 | 9291K| 2834K| 1346K (0)|
| 30 | VIEW | DBA_FREE_SPACE | 1 | 140 | 100K|00:01:53.50 | 52866 | 4865 | | | |
| 31 | UNION-ALL | | 1 | | 100K|00:01:53.48 | 52866 | 4865 | | | |
| 32 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 33 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 34 | TABLE ACCESS FULL | FET$ | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
|* 35 | TABLE ACCESS CLUSTER | TS$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 36 | INDEX UNIQUE SCAN | I_TS# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 37 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 38 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.15 | 394 | 0 | | | |
| 39 | NESTED LOOPS | | 1 | 88 | 84440 |00:00:00.06 | 390 | 0 | | | |
|* 40 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | |
|* 41 | FIXED TABLE FIXED INDEX | X$KTFBFE (ind:1) | 34 | 3 | 84440 |00:00:00.05 | 352 | 0 | | | |
|* 42 | INDEX UNIQUE SCAN | I_FILE2 | 84440 | 1 | 84440 |00:00:00.06 | 4 | 0 | | | |
|* 43 | HASH JOIN | | 1 | 50 | 16133 |00:01:53.30 | 52396 | 4865 | 2297K| 2297K| 2426K (0)|
| 44 | NESTED LOOPS | | 1 | 50 | 16133 |00:01:53.29 | 52358 | 4865 | | | |
|* 45 | HASH JOIN | | 1 | 808 | 16133 |00:01:53.26 | 52354 | 4865 | 1753K| 1753K| 1511K (0)|
|* 46 | TABLE ACCESS FULL | RECYCLEBIN$ | 1 | 152 | 191 |00:00:00.01 | 4 | 0 | | | |
| 47 | FIXED TABLE FULL | X$KTFBUE | 1 | 100K| 723K|00:01:52.95 | 52350 | 4865 | | | |
|* 48 | INDEX UNIQUE SCAN | I_FILE2 | 16133 | 1 | 16133 |00:00:00.01 | 4 | 0 | | | |
|* 49 | TABLE ACCESS FULL | TS$ | 1 | 31 | 34 |00:00:00.01 | 38 | 0 | | | |
| 50 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 51 | NESTED LOOPS | | 1 | 1 | 0 |00:00:00.01 | 38 | 0 | | | |
| 52 | MERGE JOIN CARTESIAN | | 1 | 425 | 0 |00:00:00.01 | 38 | 0 | | | |
|* 53 | TABLE ACCESS FULL | TS$ | 1 | 3 | 0 |00:00:00.01 | 38 | 0 | | | |
| 54 | BUFFER SORT | | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | 73728 | 73728 | |
|* 55 | TABLE ACCESS FULL | RECYCLEBIN$ | 0 | 152 | 0 |00:00:00.01 | 0 | 0 | | | |
| 56 | TABLE ACCESS CLUSTER | UET$ | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 57 | INDEX UNIQUE SCAN | I_FILE#_BLOCK# | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
|* 58 | INDEX UNIQUE SCAN | I_FILE2 | 0 | 1 | 0 |00:00:00.01 | 0 | 0 | | | |
| 59 | HASH GROUP BY | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | 856K| 856K| 463K (0)|
| 60 | NESTED LOOPS OUTER | | 1 | 1 | 1 |00:00:00.35 | 44 | 0 | | | |
|* 61 | HASH JOIN | | 1 | 1 | 1 |00:00:00.35 | 42 | 0 | 1281K| 1281K| 402K (0)|
| 62 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 3 | 0 | | | |
| 63 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 1 | 0 | | | |
| 64 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.35 | 0 | 0 | | | |
|* 65 | FIXED TABLE FULL | X$KCCFN | 1 | 1 | 1 |00:00:00.34 | 0 | 0 | | | |
|* 66 | FIXED TABLE FIXED INDEX | X$KCCTF (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | |
|* 67 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
| 68 | TABLE ACCESS CLUSTER | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 69 | INDEX UNIQUE SCAN | I_TS# | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
| 70 | VIEW | V_$TEMP_SPACE_HEADER | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | |
| 71 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 39 | 0 | | | |
|* 72 | TABLE ACCESS FULL | TS$ | 1 | 1 | 1 |00:00:00.01 | 38 | 0 | | | |
|* 73 | FIXED TABLE FIXED INDEX | X$KTFTHC (ind:2) | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
|* 74 | VIEW PUSHED PREDICATE | V_$TEMP_EXTENT_POOL | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
| 75 | NESTED LOOPS | | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 76 | TABLE ACCESS BY INDEX ROWID | TS$ | 1 | 1 | 1 |00:00:00.01 | 2 | 0 | | | |
|* 77 | INDEX UNIQUE SCAN | I_TS1 | 1 | 1 | 1 |00:00:00.01 | 1 | 0 | | | |
|* 78 | FIXED TABLE FIXED INDEX | X$KTSTFC (ind:1) | 1 | 1 | 1 |00:00:00.01 | 0 | 0 | | | |
------------------------------------------------------------------------------------------------------------------------------------------------------------ Predicate Information (identified by operation id):
--------------------------------------------------- 3 - access("A"."TABLESPACE_NAME"="B"."TABLESPACE_NAME")
11 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4))
12 - filter("F"."SPARE1" IS NULL)
13 - access("FNFNO"="F"."FILE#")
14 - filter("FE"."FENUM"="F"."FILE#")
16 - access("F"."TS#"="TS"."TS#")
21 - filter(("FNNAM" IS NOT NULL AND "FNTYP"=4 AND "INST_ID"=USERENV('INSTANCE') AND BITAND("FNFLG",4)<>4))
22 - filter("FNFNO"="HC"."KTFBHCAFNO")
23 - filter("F"."SPARE1" IS NOT NULL)
24 - access("FNFNO"="F"."FILE#")
25 - filter("FE"."FENUM"="F"."FILE#")
27 - access("HC"."KTFBHCTSN"="TS"."TS#")
35 - filter("TS"."BITMAPPED"=0)
36 - access("TS"."TS#"="F"."TS#")
37 - access("F"."TS#"="FI"."TS#" AND "F"."FILE#"="FI"."RELFILE#")
40 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$")))
41 - filter("TS"."TS#"="F"."KTFBFETSN")
42 - access("F"."KTFBFETSN"="FI"."TS#" AND "F"."KTFBFEFNO"="FI"."RELFILE#")
43 - access("TS"."TS#"="RB"."TS#")
45 - access("U"."KTFBUESEGTSN"="RB"."TS#" AND "U"."KTFBUESEGFNO"="RB"."FILE#" AND "U"."KTFBUESEGBNO"="RB"."BLOCK#")
46 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL))
48 - access("RB"."TS#"="FI"."TS#" AND "U"."KTFBUEFNO"="FI"."RELFILE#")
49 - filter(("TS"."BITMAPPED"<>0 AND "TS"."CONTENTS$"=0 AND INTERNAL_FUNCTION("TS"."ONLINE$")))
53 - filter("TS"."BITMAPPED"=0)
55 - filter(("RB"."TS#" IS NOT NULL AND "RB"."FILE#" IS NOT NULL AND "RB"."BLOCK#" IS NOT NULL))
57 - access("U"."TS#"="RB"."TS#" AND "U"."SEGFILE#"="RB"."FILE#" AND "U"."SEGBLOCK#"="RB"."BLOCK#")
filter("TS"."TS#"="U"."TS#")
58 - access("U"."TS#"="FI"."TS#" AND "U"."SEGFILE#"="FI"."RELFILE#")
61 - access("HC"."KTFTHCTFNO"="H"."FILE_ID" AND "TS"."NAME"="H"."TABLESPACE_NAME")
65 - filter(("V"."FNNAM" IS NOT NULL AND "V"."FNTYP"=7))
66 - filter(("TF"."TFDUP"<>0 AND BITAND("TF"."TFSTA",32)<>32 AND "V"."FNFNO"="TF"."TFNUM" AND "TF"."TFFNH"="V"."FNNUM"))
67 - filter("V"."FNFNO"="HC"."KTFTHCTFNO")
69 - access("HC"."KTFTHCTSN"="TS"."TS#")
72 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1))
73 - filter(("HC"."KTFTHCCVAL"=0 AND "HC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="HC"."KTFTHCTSN"))
74 - filter("P"."FILE_ID"="H"."FILE_ID")
76 - filter(("TS"."CONTENTS$"=1 AND "TS"."BITMAPPED"<>0 AND "TS"."ONLINE$"=1))
77 - access("TS"."NAME"="H"."TABLESPACE_NAME")
78 - filter(("FC"."INST_ID"=USERENV('INSTANCE') AND "TS"."TS#"="FC"."KTSTFCTSN")) 147 rows selected. Elapsed: 00:00:00.08
解决可以看我另外一篇博文：Oracle查询表空间使用率很慢
Oracle查询dba_extents视图很慢的更多相关文章
- Oracle 查询权限视图
在Oracle中有很多用于查权限的视图,但很多人在需要查权限时会很困惑,不知道该用哪个视图去查,这里我列出几个常见的用于查权限的视图及其用法: 1DBA_ROLE_PRIVS 该视图主要有以下2个作用 ...
- Oracle查询表空间使用率很慢
Oracle查询表空间使用率很慢 问题描述 执行查询表空间的语句,需要接近2min的时间才能执行完成. 以前也在其他客户的生产库遇到过一样的情况,当时是由于回收站的内容过多引起的. 不过这次的情况却不 ...
- 45个很实用的 Oracle 查询语句小结
这里我们介绍的是 40+ 个很实用的 Oracle 查询语句,主要涵盖了日期操作,获取server信息.获取运行状态.计算数据库大小等等方面的查询. 这些是全部 Oracle 开发人员都必备的技 ...
- 45 个非常有用的 Oracle 查询语句
这里我们介绍的是 40+ 个非常有用的 Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有 Oracle 开发者都必备的技能,所以快 ...
- Oracle之物化视图
来源于:http://www.cnblogs.com/Ronger/archive/2012/03/28/2420962.html 近期根据项目业务需要对oracle的物化视图有所接触,在网上搜寻关于 ...
- 《oracle每天一练》Oracle之物化视图
相关帖子思考和跟踪 本文转自Ronger 物化视图是一种特殊的物理表,“物化”(Materialized)视图是相对普通视图而言的.普通视图是虚拟表,应用的局限性大,任何对视图的查询,Oracle都实 ...
- 40多个非常有用的Oracle 查询语句
给大家介绍是40多个非常有用的Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有Oracle 开发者都必备的技能,所以快快收藏吧! 日期 ...
- Oracle数据库学习 视图、序列及存储过程
视图(View) 视图也被称作虚表,也就是虚拟的表,是一组数据的逻辑表示. 视图对应一个select语句,结果集被赋予一个名字,也就是视图的名字. 视图本身不包含任何数据,它只是包含映射到基表的一个查 ...
- 45个非常有用的 Oracle 查询语句小结
45个非常有用的 Oracle 查询语句小结 这里我们介绍的是 40+ 个非常有用的 Oracle 查询语句,主要涵盖了日期操作,获取服务器信息,获取执行状态,计算数据库大小等等方面的查询.这些是所有 ...
随机推荐
- Java实现 LeetCode 2 两数相加
两数相加 给出两个 非空 的链表用来表示两个非负的整数.其中,它们各自的位数是按照 逆序 的方式存储的,并且它们的每个节点只能存储 一位 数字. 如果,我们将这两个数相加起来,则会返回一个新的链表来表 ...
- JVM 由哪些部分组成？
JVM 由哪些部分组成? 解析:这是对 JVM 体系结构的考察 答:JVM 的结构基本上由 4 部分组成: 类加载器,在 JVM 启动时或者类运行时将需要的 class 加载到 JVM 中 执行引擎, ...
- java实现第六届蓝桥杯显示二叉树
显示二叉树 题目描述 排序二叉树的特征是: 某个节点的左子树的所有节点值都不大于本节点值. 某个节点的右子树的所有节点值都不小于本节点值. 为了能形象地观察二叉树的建立过程,小明写了一段程序来显示出二 ...
- Docker安装及阿里云镜像加速器配置
Docker安装 Windows系统安装就不用说了,因为Docker是开源的,所以,直接去官网:https://www.docker.com/下载安装包安装就行了 其实,Linux系统安装也很简单,照 ...
- Python API自动化测试实操
废话不多说,直接上代码截图: 我们首先来看看整个工程的目录结构,这样以便于了解项目的调用关系:config #这里是配置包 -- base_url.py 具体配置了被测系统的url and pat ...
- FT-8900, 8800,7800 , FT-897, 857 e 817 连接中继板接线图
FT-8900, 8800,7800 , FT-897, 857 e 817 等 车台支持Moto GM950i GM300(只适合接收) GM3688等
- JSP+Structs+JDBC+mysql实现的诚欣电子商城
项目简介 项目来源于:https://github.com/SuperiorNature/Java-Enterprise-electronic-mall 本系统是基于JSP+Structs+JDBC+ ...
- Koa源码解析，带你实现一个迷你版的Koa
前言 本文是我在阅读 Koa 源码后,并实现迷你版 Koa 的过程.如果你使用过 Koa 但不知道内部的原理,我想这篇文章应该能够帮助到你,实现一个迷你版的 Koa 不会很难. 本文会循序渐进的解析内 ...
- [computer graphics]简单光照模型(Phong和Blinn-Phong)和明暗处理
简单光照模型(Phong和Blinn-Phong)和明暗处理 支持点光源和平行光,是一种简单光照模型,它将光照分解成了三个部分,分别为 漫反射 镜面反射 环境光 如图所示,是一个简单的几何模型. \( ...
- HttpClient 常用方法封装
简介 在平时写代码中,经常需要对接口进行访问,对于 http 协议 rest 风格的接口请求,大多使用 HttpClient 工具进行编写,想着方便就寻思着把一些常用的方法进行封装,便于平时快速的使用 ...