评估数据库服务器负载

--评估数据库服务器负载


--使用脚本来获取数据库的服务器负载。

--通过查询v$metric视图来获取当前度量值。

SYS@PROD1> start host_load_setup.sql
SYS@PROD1> 
SYS@PROD1> 
SYS@PROD1> CREATE TYPE t_host_load AS OBJECT (
  2  	     begin_time DATE,
  3  	     duration NUMBER,
  4  	     db_fg_cpu NUMBER,
  5  	     db_bg_cpu NUMBER,
  6  	     non_db_cpu NUMBER,
  7  	     os_load NUMBER,
  8  	     num_cpu NUMBER
  9  );
 10  /
SYS@PROD1> 
SYS@PROD1> CREATE TYPE t_host_load_tab IS TABLE OF t_host_load;
  2  /
SYS@PROD1> 
SYS@PROD1> CREATE OR REPLACE FUNCTION host_load(p_count IN NUMBER DEFAULT 1) -- number of samples (1 sample per minute)
  2    RETURN t_host_load_tab					       -- set p_count to 0 to loop forever
  3    PIPELINED
  4  AS
  5  	     l_begin_time DATE;
  6  	     l_duration NUMBER;
  7  	     l_db_fg_cpu NUMBER;
  8  	     l_db_bg_cpu NUMBER;
  9  	     l_non_db_cpu NUMBER;
 10  	     l_os_load NUMBER;
 11  	     l_num_cpu NUMBER;
 12  	     l_samples INTEGER := 0;
 13  	     l_previous_time DATE := sysdate-1;
 14  BEGIN
 15    BEGIN
 16  	 SELECT value INTO l_num_cpu
 17  	 FROM v$osstat
 18  	 WHERE stat_name = 'NUM_CPU_CORES';
 19    EXCEPTION
 20  	 WHEN no_data_found THEN
 21  	   SELECT value INTO l_num_cpu
 22  	   FROM v$osstat
 23  	   WHERE stat_name = 'NUM_CPUS';
 24    END;
 25    LOOP
 26  	 SELECT begin_time,
 27  		duration,
 28  		db_fg,
 29  		db_bg,
 30  		host - db_fg - db_bg AS non_db,
 31  		os_load
 32  	     INTO l_begin_time,
 33  		  l_duration,
 34  		  l_db_fg_cpu,
 35  		  l_db_bg_cpu,
 36  		  l_non_db_cpu,
 37  		  l_os_load
 38  	 FROM (
 39  	   SELECT begin_time,
 40  		  intsize_csec/100 AS duration,
 41  		  sum(case when metric_name = 'Host CPU Usage Per Sec' then value/100 else 0 end) AS host,
 42  		  sum(case when metric_name = 'CPU Usage Per Sec' then value/100 else 0 end) AS db_fg,
 43  		  sum(case when metric_name = 'Background CPU Usage Per Sec' then value/100 else 0 end) AS db_bg,
 44  		  sum(case when metric_name = 'Current OS Load' then value else 0 end) AS os_load
 45  	   FROM v$metric
 46  	   WHERE group_id = (SELECT group_id FROM v$metricgroup WHERE name = 'System Metrics Long Duration')
 47  	   AND metric_name IN ('CPU Usage Per Sec',
 48  			       'Background CPU Usage Per Sec',
 49  			       'Host CPU Usage Per Sec',
 50  			       'Current OS Load')
 51  	   GROUP BY begin_time, intsize_csec
 52  	 )
 53  	 ORDER BY begin_time;
 54  	 IF l_previous_time < l_begin_time
 55  	 THEN
 56  	   PIPE ROW(t_host_load(l_begin_time,
 57  				l_duration,
 58  				l_db_fg_cpu,
 59  				l_db_bg_cpu,
 60  				l_non_db_cpu,
 61  				l_os_load,
 62  				l_num_cpu));
 63  	   l_samples := l_samples + 1;
 64  	 END IF;
 65  	 EXIT WHEN l_samples = p_count;
 66  	 l_previous_time := l_begin_time;
 67  	 dbms_lock.sleep(5);
 68    END LOOP;
 69    RETURN;
 70  END host_load;
 71  /
SYS@PROD1> 
SYS@PROD1> SHOW ERROR
No errors.
SYS@PROD1> 
SYS@PROD1> CREATE PUBLIC SYNONYM host_load FOR host_load;
SYS@PROD1> 
SYS@PROD1> GRANT EXECUTE ON host_load TO PUBLIC;
SYS@PROD1> start host_load.sql 15
SYS@PROD1> SET ECHO OFF

			  PROD1 / 2017-03-08

BEGIN_TIME DURATION DB_FG_CPU DB_BG_CPU NON_DB_CPU OS_LOAD NUM_CPU
---------- -------- --------- --------- ---------- ------- -------
16:00:04      60.08	 0.01	   0.00       0.06    0.10	 1
16:01:04      60.08	 0.01	   0.00       0.06    0.04	 1
16:02:05      60.09	 0.01	   0.01       0.05    0.01	 1
16:03:06      60.08	 0.03	   0.00       0.06    0.13	 1
16:04:06      60.07	 0.03	   0.01       0.08    1.17	 1
16:05:07      60.32	 0.09	   0.06       0.08    2.52	 1
16:06:34      59.34	 0.08	   0.06       0.07    3.49	 1
16:07:53      60.53	 0.07	   0.05       0.08    3.57	 1
16:09:06      59.99	 0.08	   0.06       0.08    4.14	 1
16:10:17      59.87	 0.08	   0.05       0.08    4.01	 1
16:11:28      60.15	 0.02	   0.01       0.05    2.00	 1
16:12:32      60.34	 0.01	   0.05       0.06    1.18	 1
16:13:33      59.09	 0.00	   0.07       0.03    0.58	 1
16:14:38      60.27	 0.01	   0.00       0.05    0.29	 1
16:15:38      60.43	 0.01	   0.00       0.05    0.11	 1