从DBA_HIST_SQLSTAT视图中查找过去时段最占用资源的会话

超过阀值的SQL语句会在AWR中保存一段时间（默认是7天），可以通过DBA_HIST_SQLSTAT视图查询。

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 select snap_id, disk_reads_delta reads_delta,
 executions_delta exec_delta, disk_reads_delta /decode
 (executions_delta, 0, 1,executions_delta) rds_exec_ratio,
 sql_id
 from dba_hist_sqlstat
 where disk_reads_delta > 100000
 order by disk_reads_delta desc;

SNAP_ID	READS_DELTA	EXEC_DELTA	RDS_EXEC_RATIO	SQL_ID
39	511106	1	511106	8h1qaqha580hh
29	216898	3	72299.33	d5bcqvumxr4y4

再根据SQL_ID，在DBA_HIST_SQLTEXT中查看相关SQL语句

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 select command_type,sql_text
 from dba_hist_sqltext
 where sql_id='d5bcqvumxr4y4';

COMMAND_TYPE	SQL_TEXT
3	select count(id) from bom

注：COMMAND_TYPE=3表示这是SELECT命令，完整的COMMAND_TYPE可以SELECT * FROM AUDIT_ACTIONS;

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同样可以查看之前命令的执行计划

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 select *
 from table(DBMS_XPLAN.DISPLAY_AWR('8h1qaqha580hh'));

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转载于:http://blog.itpub.net/22621861/viewspace-1281602/