Oracle 性能报告 AWR

(\AWR(从ORACLE 10G后预安装到ORACLE中)

自动工作负载资料库(automatic workload repository)
查看当前的AWR保存策略:
col SNAP_INTERVAL format a20
col RETENTION format a20

SELECT * FROM DBA_HIST_WR_CONTROL;

0.set collation time

BEGIN
  DBMS_WORKLOAD_REPOSITORY.modify_snapshot_settings(
    retention => 43200,        -- Minutes (43200 = 30 Days).
                               -- Current value retained if NULL.
    interval  => 30);          -- Minutes. Current value retained if NULL.
END;
/

1、手工创建一个快照:
EXEC DBMS_WORKLOAD_REPOSITORY.CREATE_SNAPSHOT();

2、查看AWR的快照ID
SELECT SNAP_ID,
TO_CHAR(BEGIN_INTERVAL_TIME,'yyyy-mm-dd hh24:mi:ss') BEGIN_INTERVAL_TIME,
TO_CHAR(STARTUP_TIME,'yyyy-mm-dd hh24:mi:ss') STARTUP_TIME
FROM DBA_HIST_SNAPSHOT ORDER BY 1;

3、获取AWR报告:
@?/rdbms/admin/awrrpt

4、如果用 sys 之外的用户创建 AWR 报告则需要授予相应的权限:
CONNECT / AS SYSDBA
GRANT ADVISOR TO SCOTT;
GRANT SELECT_CATALOG_ROLE TO SCOTT;
GRANT EXECUTE ON sys.dbms_workload_repository TO SCOTT;

AWR报告内容非常全面，主要包括：WAIT EVENT, SQL, IO, MTTR ADVIRSORY, PGA MEMORY ADVISORY, SHARED POOL ADVISORY, SGA ADVISORY, UNDO, LATCH, SEGMENT。