前言

前段时间报表数据库上有条insert sql语句，插入的大量数据，执行非常慢，需要对其进行分析优化。

分析步骤是在：ARCHIVE与NOARCHIVE模式下进行。

测试场景: 分别对表的常规插入，表在append插入，表在append + parallel插入进行性能测试，得出结果。

环境准备

数据库版本 基础表 nologging表 logging表
Oracle 11g T1 T2 T3 
#创建T1,T2,T3表

create table t1 as select * from dba_objects;

create table t2 as select * from dba_objects where 1=2;

create table t3 as select * from dba_objects where 1=2;

#往T1表插入数据

SQL> insert into t1 select * from t1;

72813 rows created.

SQL> /

145626 rows created.

SQL> /

291252 rows created.

SQL> select count(*) from t1;

  COUNT(*)

----------

    582504

#设置T2表为nologging属性

SQL> alter table t2 nologging;

Table altered.

数据库处于ARCHIVE时

常规插入

nologging 表T2

SQL> insert into t2 select * from t1;

commit;

582824 rows created.

Execution Plan

----------------------------------------------------------

Plan hash value: 3617692013

---------------------------------------------------------------------------------

| Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time |

---------------------------------------------------------------------------------

|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |

|   1 |  LOAD TABLE CONVENTIONAL | T2   |   |   |        |      |

|   2 |   TABLE ACCESS FULL  | T1   |   582K|    53M|  1455   (2)| 00:00:18 |

---------------------------------------------------------------------------------

Statistics

----------------------------------------------------------

       3345  recursive calls

      46879  db block gets

      27878  consistent gets

       8269  physical reads

   67752144  redo size

    838  bytes sent via SQL*Net to client

    784  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      3  sorts (memory)

      0  sorts (disk)

     582824  rows processed

SQL>

Commit complete.

耗费：67752144 redo size

logging 表T3

SQL> insert into t3 select * from t1;

commit;

582824 rows created.

Execution Plan

----------------------------------------------------------

Plan hash value: 3617692013

---------------------------------------------------------------------------------

| Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time |

---------------------------------------------------------------------------------

|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |

|   1 |  LOAD TABLE CONVENTIONAL | T3   |   |   |        |      |

|   2 |   TABLE ACCESS FULL  | T1   |   582K|    53M|  1455   (2)| 00:00:18 |

---------------------------------------------------------------------------------

Statistics

----------------------------------------------------------

       2860  recursive calls

      46875  db block gets

      27811  consistent gets

      1  physical reads

   67875992  redo size

    829  bytes sent via SQL*Net to client

    784  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

SQL>

Commit complete.

耗费：67875992 redo size

append 插入

nologging 表T2

SQL> insert /*+ append */  into t2 select * from t1;

commit;

582824 rows created.

Execution Plan

----------------------------------------------------------

ERROR:

ORA-12838: cannot read/modify an object after modifying it in parallel

SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics

----------------------------------------------------------

       2627  recursive calls

       9324  db block gets

       8832  consistent gets

      0  physical reads

     143436  redo size

    824  bytes sent via SQL*Net to client

    798  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：143436 redo size

logging 表T3

SQL> insert /*+ append */ into t3 select * from t1; 

582824 rows created.

Execution Plan

----------------------------------------------------------

ERROR:

ORA-12838: cannot read/modify an object after modifying it in parallel

SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics

----------------------------------------------------------

       2627  recursive calls

       9327  db block gets

       8832  consistent gets

      0  physical reads

   68384900  redo size

    822  bytes sent via SQL*Net to client

    797  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：68384900 redo size

parallel + append 插入

nologging 表T2

SQL> alter session enable parallel dml;

insert /*+ append parallel(2) */ into t2 select * from t1;

commit;

Session altered.

SQL> 

582824 rows created.

Execution Plan

----------------------------------------------------------

ERROR:

ORA-12838: cannot read/modify an object after modifying it in parallel

SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics

----------------------------------------------------------

     52  recursive calls

     32  db block gets

     19  consistent gets

      0  physical reads

      21916  redo size

    824  bytes sent via SQL*Net to client

    809  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：21916 redo size

logging 表T3

SQL> alter session enable parallel dml;

insert /*+ append parallel(2)*/ into t3 select * from t1;

commit;

Session altered.

SQL> 

582824 rows created.

Execution Plan

----------------------------------------------------------

ERROR:

ORA-12838: cannot read/modify an object after modifying it in parallel

SP2-0612: Error generating AUTOTRACE EXPLAIN report

Statistics

----------------------------------------------------------

     50  recursive calls

     33  db block gets

     20  consistent gets

      0  physical reads

      21308  redo size

    824  bytes sent via SQL*Net to client

    808  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：21308 redo size

数据库处于NOARCHIVE时

常规插入

nologging 表T2

Execution Plan

----------------------------------------------------------

Plan hash value: 3617692013

---------------------------------------------------------------------------------

| Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time |

---------------------------------------------------------------------------------

|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |

|   1 |  LOAD TABLE CONVENTIONAL | T2   |   |   |        |      |

|   2 |   TABLE ACCESS FULL  | T1   |   582K|    53M|  1455   (2)| 00:00:18 |

---------------------------------------------------------------------------------

Statistics

----------------------------------------------------------

       2538  recursive calls

      46869  db block gets

      27796  consistent gets

       8266  physical reads

   67754744  redo size

    824  bytes sent via SQL*Net to client

    784  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：67754744 redo size

logging 表T3

Execution Plan

----------------------------------------------------------

Plan hash value: 3617692013

---------------------------------------------------------------------------------

| Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time |

---------------------------------------------------------------------------------

|   0 | INSERT STATEMENT     |  |   582K|    53M|  1455   (2)| 00:00:18 |

|   1 |  LOAD TABLE CONVENTIONAL | T3   |   |   |        |      |

|   2 |   TABLE ACCESS FULL  | T1   |   582K|    53M|  1455   (2)| 00:00:18 |

---------------------------------------------------------------------------------

Statistics

----------------------------------------------------------

       2593  recursive calls

      46873  db block gets

      27800  consistent gets

       1600  physical reads

   67757328  redo size

    824  bytes sent via SQL*Net to client

    784  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      3  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：67757328 redo size

append 插入

nologging 表T2

Statistics

----------------------------------------------------------

       2627  recursive calls

       9324  db block gets

       8832  consistent gets

       2993  physical reads

     143480  redo size

    822  bytes sent via SQL*Net to client

    798  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：143480 redo size

logging 表T3

Statistics

----------------------------------------------------------

       2627  recursive calls

       9327  db block gets

       8832  consistent gets

      0  physical reads

     143420  redo size

    821  bytes sent via SQL*Net to client

    798  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：143420 redo size

parallel + append 插入

nologging 表T2

Statistics

----------------------------------------------------------

     50  recursive calls

     32  db block gets

     21  consistent gets

      0  physical reads

      21896  redo size

    823  bytes sent via SQL*Net to client

    810  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：21896 redo size

logging 表T3

Statistics

----------------------------------------------------------

     50  recursive calls

     33  db block gets

     20  consistent gets

      0  physical reads

      21896  redo size

    821  bytes sent via SQL*Net to client

    809  bytes received via SQL*Net from client

      3  SQL*Net roundtrips to/from client

      1  sorts (memory)

      0  sorts (disk)

     582824  rows processed

耗费：21896 redo size

综合比较

属性 表名 常规插入产生的redo size apppend插入产生的redo size apppend + parallel插入产生的redo size
数据库模式 archive
nologing t2 67752144 143436 21916
loging t3 67875992 68384900 21308
数据库模式 noarchive
nologing t2 67754744 143480 21896
loging t3 67757328 143420 21896

1）数据库处于ARCHIVE模式时，对logging表执行append插入，是对性能没有优化的。加并行parallel才会有影响。

2）数据库处于NOARCHIVE模式时，对logging表执行append插入，可以有效的提升性能。当然加并行parallel效果会更好

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