-查询最慢的sql

select * from (
select parsing_user_id,executions,sorts
command_type,disk_reads,sql_text from v$sqlarea order by disk_reads desc
)where rownum<10

--查询对应session

select SE.SID,SE.SERIAL#,PR.SPID,
SE.USERNAME,SE.STATUS,SE.TERMINAL,
SE.PROGRAM,SE.MODULE,
SE.SQL_ADDRESS,ST.EVENT,
ST.P1TEXT,SI.PHYSICAL_READS,SI.BLOCK_CHANGES from v$session se,v$session_wait
st,
v$sess_io si,v$process pr
where st.SID=se.SID and st.SID=si.SID
AND SE.PADDR=PR.ADDR
AND SE.SID>6
AND ST.WAIT_TIME=0
AND ST.EVENT NOT LIKE '%SQL%'
ORDER BY PHYSICAL_READS DESC;
SELECT sql_address FROM V$SESSION SS,V$SQLTEXT TT
WHERE SS.SQL_HASH_VALUE=TT.HASH_VALUE AND SID=439;

v$sqltext:存储的是完整的SQL,SQL被分割

v$sqlarea:存储的SQL 和一些相关的信息,比如累计的执行次数,逻辑读,物理读等统计信息(统计)

v$sql:内存共享SQL区域中已经解析的SQL语句。(即时)

根据sid查找完整sql语句:

select sql_text from v$sqltext a where
a.hash_value = (select sql_hash_value from v$session b where b.sid =
'&sid'    )
order by piece asc

select a.CPU_TIME,--CPU时间 百万分之一(微秒)
       a.OPTIMIZER_MODE,--优化方式
       a.EXECUTIONS,--执行次数
       a.DISK_READS,--读盘次数
       a.SHARABLE_MEM,--占用shared pool的内存多少
       a.BUFFER_GETS,--读取缓冲区的次数
       a.COMMAND_TYPE,--命令类型(3:select,2:insert;6:update;7delete;47:pl/sql程序单元)
       a.SQL_TEXT,--Sql语句
       a.SHARABLE_MEM,
       a.PERSISTENT_MEM,
       a.RUNTIME_MEM,
       a.PARSE_CALLS,
       a.DISK_READS,
       a.DIRECT_WRITES,
       a.CONCURRENCY_WAIT_TIME,
       a.USER_IO_WAIT_TIME
  from SYS.V_$SQLAREA a
 WHERE PARSING_SCHEMA_NAME = 'CHEA_FILL'--表空间
 order by a.CPU_TIME desc

引用:http://jenniferok.iteye.com/blog/700985

从V$SQLAREA中查询最占用资源的查询

select b.username username,a.disk_reads
reads,
    a.executions
exec,a.disk_reads/decode(a.executions,0,1,a.executions) rds_exec_ratio,
    a.sql_text Statement
from  v$sqlarea a,dba_users b
where a.parsing_user_id=b.user_id
 and a.disk_reads > 100000
order by a.disk_reads desc;

用buffer_gets列来替换disk_reads列可以得到占用最多内存的sql语句的相关信息。

v$sql:内存共享SQL区域中已经解析的SQL语句。(即时)

列出使用频率最高的5个查询:

select sql_text,executions
from (select sql_text,executions,
   rank() over
    (order by executions desc) exec_rank
   from v$sql)
where exec_rank <=5;

消耗磁盘读取最多的sql top5:
select
disk_reads,sql_text
from (select sql_text,disk_reads,
   dense_rank() over
     (order by disk_reads desc) disk_reads_rank
   from v$sql)
where disk_reads_rank <=5;

找出需要大量缓冲读取(逻辑读)操作的查询:

select buffer_gets,sql_text
from (select sql_text,buffer_gets,
   dense_rank() over
     (order by buffer_gets desc) buffer_gets_rank
   from v$sql)
where buffer_gets_rank<=5;

v$sqlarea字段定义:http://happyhou.blog.sohu.com/60494432.html

SQL_TEXT

VARCHAR2(1000)

First thousand characters of the SQL text for the
current cursor

SQL_ID

VARCHAR2(13)

SQL identifier of the parent cursor in the library
cache

SHARABLE_MEM

NUMBER

Amount of shared memory used by a cursor. If multiple
child cursors exist, then the sum of all shared memory used by all child
cursors.

PERSISTENT_MEM

NUMBER

Fixed amount of memory used for the lifetime of an open
cursor. If multiple child cursors exist, the fixed sum of memory used for the
lifetime of all the child cursors.

RUNTIME_MEM

NUMBER

Fixed amount of memory required during execution of a
cursor. If multiple child cursors exist, the fixed sum of all memory required
during execution of all the child cursors.

SORTS

NUMBER

Sum of the number of sorts that were done for all the
child cursors

VERSION_COUNT

NUMBER

Number of child cursors that are present in the cache
under this parent

LOADED_VERSIONS

NUMBER

Number of child cursors that are present in the cache
and have their context heap (KGL heap 6) loaded

OPEN_VERSIONS

NUMBER

The number of child cursors that are currently open
under this current parent

USERS_OPENING

NUMBER

Number of users that have any of the child cursors open

FETCHES

NUMBER

Number of fetches associated with the SQL statement

EXECUTIONS

NUMBER

Total number of executions, totalled over all the child
cursors

END_OF_FETCH_COUNT

NUMBER

Number of times this cursor was fully executed since the
cursor was brought into the library cache. The value of this statistic is not
incremented when the cursor is partially executed, either because it failed
during the execution or because only the first few rows produced by this
cursor are fetched before the cursor is closed or re-executed. By definition,
the value of theEND_OF_FETCH_COUNT column should be less or equal
to the value of the EXECUTIONS column.

USERS_EXECUTING

NUMBER

Total number of users executing the statement over all
child cursors

LOADS

NUMBER

Number of times the object was loaded or reloaded

FIRST_LOAD_TIME

VARCHAR2(19)

Timestamp of the parent creation time

INVALIDATIONS

NUMBER

Total number of invalidations over all the child
cursors

PARSE_CALLS

NUMBER

Sum of all parse calls to all the child cursors under
this parent

DISK_READS

NUMBER

Sum of the number of disk reads over all child cursors

DIRECT_WRITES

NUMBER

Sum of the number of direct writes over all child
cursors

BUFFER_GETS

NUMBER

Sum of buffer gets over all child cursors

APPLICATION_WAIT_TIME

NUMBER

Application wait time

CONCURRENCY_WAIT_TIME

NUMBER

Concurrency wait time

CLUSTER_WAIT_TIME

NUMBER

Cluster wait time

USER_IO_WAIT_TIME

NUMBER

User I/O Wait Time

PLSQL_EXEC_TIME

NUMBER

PL/SQL execution time

JAVA_EXEC_TIME

NUMBER

Java execution time

ROWS_PROCESSED

NUMBER

Total number of rows processed on behalf of this SQL
statement

COMMAND_TYPE

NUMBER

Oracle command type definition

OPTIMIZER_MODE

VARCHAR2(25)

Mode under which the SQL statement was executed

PARSING_USER_ID

NUMBER

User ID of the user that has parsed the very first
cursor under this parent

PARSING_SCHEMA_ID

NUMBER

Schema ID that was used to parse this child cursor

KEPT_VERSIONS

NUMBER

Number of child cursors that have been marked to be
kept using the DBMS_SHARED_POOL package

ADDRESS

RAW(4 | 8)

Address of the handle to the parent for this cursor

HASH_VALUE

NUMBER

Hash value of the parent statement in the library cache

OLD_HASH_VALUE

NUMBER

Old SQL hash value

MODULE

VARCHAR2(64)

Contains the name of the module that was executing at
the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_MODULE

MODULE_HASH

NUMBER

Hash value of the module that is named in the MODULEcolumn

ACTION

VARCHAR2(64)

Contains the name of the action that was executing at
the time that the SQL statement was first parsed as set by calling DBMS_APPLICATION_INFO .SET_ACTION

ACTION_HASH

NUMBER

Hash value of the action that is named in the ACTIONcolumn

SERIALIZABLE_ABORTS

NUMBER

Number of times the transaction fails to serialize,
producing ORA-08177 errors, totalled over all the
child cursors

CPU_TIME

NUMBER

CPU time (in microseconds) used by this cursor for
parsing/executing/fetching

ELAPSED_TIME

NUMBER

Elapsed time (in microseconds) used by this cursor for
parsing/executing/fetching

IS_OBSOLETE

VARCHAR2(1)

Indicates whether the cursor has become obsolete (Y ) or not (N ). This can happen if the number
of child cursors is too large.

CHILD_LATCH

NUMBER

Child latch number that is protecting the cursor

PROGRAM_ID

NUMBER

Program identifie

原文地址:http://blog.csdn.net/sxhong/article/details/18262663

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