十年网站开发经验 + 多家企业客户 + 靠谱的建站团队
量身定制 + 运营维护+专业推广+无忧售后，网站问题一站解决
快照 SQL> col begin_interval_time for a30 SQL> col end_interval_time for a30 SQL> select snap_id, to_char(begin_interval_time,'yyyy-mm-dd hh34:mi:ss') begin_interval_time, to_char(end_interval_time,'yyyy-mm-dd hh34:mi:ss') end_interval_time from dba_hist_snapshot order by 1; SNAP_ID BEGIN_INTERVAL_TIME END_INTERVAL_TIME ---------- ------------------------------ ------------------------------ 155 2018-06-25 19:00:22 2018-06-25 20:00:25 156 2018-06-25 20:00:25 2018-06-25 21:00:27 157 2018-06-25 21:00:27 2018-06-25 22:00:33 158 2018-06-25 22:00:33 2018-06-25 23:00:36 159 2018-06-25 23:00:36 2018-06-26 00:00:39 160 2018-06-26 00:00:39 2018-06-26 01:00:41 161 2018-06-26 01:52:17 2018-06-26 02:04:22 162 2018-06-26 02:04:22 2018-06-26 03:00:24 163 2018-06-26 03:00:24 2018-06-26 04:00:27 164 2018-06-26 04:00:27 2018-06-26 05:00:29 165 2018-06-26 05:00:29 2018-06-26 06:00:32 SQL> exec dbms_workload_repository.create_snapshot(); PL/SQL procedure successfully completed. SQL> exec dbms_workload_repository.drop_snapshot_range(low_snap_id=>150,high_snap_id=>154); PL/SQL procedure successfully completed. SQL> col snap_interval for a20 SQL> col retention for a20 SQL> select snap_interval,retention,topnsql from dba_hist_wr_control; SNAP_INTERVAL RETENTION TOPNSQL -------------------- -------------------- ------------------------------ +00000 01:00:00.0 +00008 00:00:00.0 DEFAULT SQL> exec dbms_workload_repository.modify_snapshot_settings(retention=>15*1440,interval=>30); PL/SQL procedure successfully completed. SQL> select snap_interval,retention,topnsql from dba_hist_wr_control; SNAP_INTERVAL RETENTION TOPNSQL -------------------- -------------------- ------------------------------ +00000 00:30:00.0 +00015 00:00:00.0 DEFAULT 基线 SQL> exec dbms_workload_repository.create_baseline(start_snap_id=>155,end_snap_id=>156,baseline_name=>'baseline01'); PL/SQL procedure successfully completed. SQL> col baseline_name for a30 SQL> select baseline_name,baseline_id,start_snap_id,end_snap_id from dba_hist_baseline; BASELINE_NAME BASELINE_ID START_SNAP_ID END_SNAP_ID ------------------------------ ----------- ------------- ----------- baseline01 1 155 156 SYSTEM_MOVING_WINDOW 0 1 168 SQL> exec dbms_workload_repository.drop_baseline(baseline_name=>'baseline01',cascade=>false); PL/SQL procedure successfully completed. SQL> select baseline_name,baseline_id,start_snap_id,end_snap_id from dba_hist_baseline; BASELINE_NAME BASELINE_ID START_SNAP_ID END_SNAP_ID ------------------------------ ----------- ------------- ----------- SYSTEM_MOVING_WINDOW 0 1 168 报告 SQL> @?/rdbms/admin/awrrpt.sql --生成最常见的AWR报告方式 SQL> @?/rdbms/admin/awrddrpt.sql --比较两个AWR报告 SQL> @?/rdbms/admin/awrsqrpt.sql --生成AWR报告中指定sql_id的执行计划