1.耗費CPU或者是執行計劃較多的sql語句的查詢

SELECT T.CPU_TIME,--語句解析和執行的cpu時間

T.EXECUTIONS,--從加入緩存后的執行次數

T.ELAPSED_TIME,--語句解析和執行的時間

T.SORTS,

T.PARSE_CALLS,--軟硬解析次數

T.OPTIMIZER_COST,--優化器計算的成本

T.SQL_TEXT--執行的sql語句

FROM SYS.V_$SQL T

WHERE T.OPTIMIZER_COST IS NOT NULL

AND T.EXECUTIONS > 500

ORDER BY T.OPTIMIZER_COST DESC;

2.獲取耗費資源最多的sql語句

select * from

(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 sys.v_$sqlarea a, sys.dba_users b

where a.PARSING_USER_ID = b.user_id

and (b.username = '' or b.username = '')

and a.DISK_READS >= 50 ) t

where t.rds_exec_ratio >= 1

order by t.rds_exec_ratio desc;

3.查看當前會話信息

通過plsql中的工具欄中的會話，查看當前活躍會話，通過查看會話當前執行sql，判斷性能瓶頸問題

查詢當前活躍會話sql:

select * from SYS.V_$SESSION t where t.STATUS='ACTIVE' and osuser='' and type='' and username=''

當前會話游標信息：

select * from v$open_cursor where sid = :sid；

當前會話sql信息：

select sql_text from v$sqltext_with_newlines where address = hextoraw(:sql_address) and hash_value = :sql_hash_value order by piece / concatenate /

當前會話耗費信息：

select names.name, stats.statistic#, stats.value from v$sesstat stats, v$statname names where stats.sid = :sid and names.Statistic# = stats.Statistic# order by stats.statistic#

當前會話鎖信息：

select l.*, o.owner object_owner, o.object_Name from sys.all_objects o, v$lock l where l.sid = :sid and l.type = 'TM' and o.object_id = l.id1

根據會話查看當前sql的消耗：

SELECT T.SID,

T1.SQL_TEXT,

T1.CPU_TIME,

T1.EXECUTIONS,

T1.OPTIMIZER_COST,

T1.ELAPSED_TIME,

T1.ELAPSED_TIME / T1.EXECUTIONS AS UNIT_ELAPSED_TIME,

T1.CPU_TIME / T1.EXECUTIONS AS UNIT_CPU_TIME

FROM SYS.V$SESSION T, SYS.V$SQL T1

WHERE T.STATUS = 'ACTIVE'

AND TYPE = ''

AND USERNAME = ''

AND T1.HASH_VALUE = T.SQL_HASH_VALUE

ORDER BY T1.CPU_TIME DESC

總結

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