oracleデータベースCPU高すぎる問題の位置づけ、分析（五）
11472 ワード
一、Sqlクエリのインデックスなしの大きいテーブルを実行して、サーバーのコアCPUを100%近く使用させます。
転載先:http://blog.itpub.net/31479729/viewspace-2168961/
SQL> select * from scott.t3 where name=dbms_random.string('u', 10);
top - 19:35:32 up 1 day, 12:26, 6 users, load average: 0.15, 0.04, 0.01
Tasks: 236 total, 2 running, 234 sleeping, 0 stopped, 0 zombie
Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu1 : 99.3%us, 0.7%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2039644k total, 1935220k used, 104424k free, 140204k buffers
Swap: 4095992k total, 46008k used, 4049984k free, 1273692k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20394 oracle 20 0 542m 54m 50m R 99.8 2.8 0:08.82 oracle
1 root 20 0 19396 1204 936 S 0.0 0.1 0:01.28 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.44 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 0:22.40 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/0
7 root RT 0 0 0 0 S 0.0 0.0 0:00.48 migration/1
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
9 root 20 0 0 0 0 S 0.0 0.0 0:00.50 ksoftirqd/1
10 root RT 0 0 0 0 S 0.0 0.0 0:00.06 watchdog/1
11 root 20 0 0 0 0 S 0.0 0.0 0:13.44 events/0
12 root 20 0 0 0 0 S 0.0 0.0 0:00.51 events/1
13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 cpuset
14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khelper
15 root 20 0 0 0 0 S 0.0 0.0 0:00.00 netns
16 root 20 0 0 0 0 S 0.0 0.0 0:00.00 async/mgr
17 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pm
18 root 20 0 0 0 0 S 0.0 0.0 0:00.00 sync_supers
19 root 20 0 0 0 0 S 0.0 0.0 0:00.00 bdi-default
20 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kintegrityd/0
21 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kintegrityd/1
22 root 20 0 0 0 0 S 0.0 0.0 0:00.62 kblockd/0
23 root 20 0 0 0 0 S 0.0 0.0 0:00.19 kblockd/1
24 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpid
25 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpi_notify
26 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kacpi_hotplug
27 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ata/0
28 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ata/1
29 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ata_aux
30 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksuspend_usbd
31 root 20 0 0 0 0 S 0.0 0.0 0:00.02 khubd
32 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kseriod
33 root 20 0 0 0 0 S 0.0 0.0 0:00.00 md/0
34 root 20 0 0 0 0 S 0.0 0.0 0:00.00 md/1
35 root 20 0 0 0 0 S 0.0 0.0 0:00.00 md_misc/0
36 root 20 0 0 0 0 S 0.0 0.0 0:00.00 md_misc/1
37 root 20 0 0 0 0 S 0.0 0.0 0:00.01 khungtaskd
38 root 20 0 0 0 0 S 0.0 0.0 0:05.76 kswapd0
39 root 25 5 0 0 0 S 0.0 0.0 0:00.00 ksmd
SQL> select * from (select s.sql_id,s.SQL_TEXT,s.CPU_TIME / 1000000 cpu from v$sqlstats s order by s.CPU_TIME desc) where rownum<=2;
SQL_IDSQL_TEXT CPU
-------------------------------------------------------------------------------------------------------
gmkaj9nz7vyvwselect * from scott.t3 where name=dbms_random.string('u', 10) 60.965731
SQL_IDSQL_TEXT CPU
-------------------------------------------------------------------------------------------------------
d2dkktkqvxhp6
SELECT T.TABLE_NAME, T.TABLESPACE_NAME, T.NUM_ROWS, TC.COMMENTS, T.LOGGING, T.TA
BLE_LOCK, T.ROW_MOVEMENT, T.CLUSTER_NAME, T.PCT_FREE, T.PCT_USED, T.INI_TRANS, T.MAX_TRANS, T.INITIAL_EXTENT, T.NEXT_EXTENT, T.MIN_EXTENTS, T.MAX_EXTENTS, T.PCT
_INCREASE, T.FREELISTS, T.FREELIST_GROUPS, T.BLOCKS, T.EMPTY_BLOCKS, T.AVG_SPACE
, T.CHAIN_CNT, T.AVG_SPACE_FREELIST_BLOCKS, T.NUM_FREELIST_BLOCKS, T.SAMPLE_SIZE
, T.GLOBAL_STATS, T.USER_STATS, T.DURATION, T.SKIP_CORRUPT, T.AVG_ROW_LEN, T.OBJ
ECT_ID_TYPE, T.TABLE_TYPE_OWNER, T.TABLE_TYPE, T.COMPRESS_FOR, T.STATUS DROP_TAB
LE_STATUS, T.COMPRESSION, T.DROPPED, T.CLUSTER_OWNER, T.DEPENDENCIES, T.IOT_NAME
, T.BACKED_UP, T.DEGREE, T.INSTANCES, T.CACHE, T.LAST_ANALYZED, T.PARTITIONED, T.IOT_TYPE, T.TEMPORARY, T.SECONDARY, T.NESTED, T.BUFFER_POOL, T.MONITORING, (SEL
ECT STATUS FROM SYS.ALL_OBJECTS WHERE OWNER = T.OWNER AND OBJECT_NAME = T.TABLE_
NAME AND OBJECT_TYPE = 'TABLE' AND SUBOBJECT_NAME IS NULL) STATUS, (SELECT GENER
ATED FROM SYS.ALL_OBJECTS WHERE OWNER =
.776882
SQL> select id,operation,options,object_owner,object_name,object_type,optimizer,cost,bytes,cpu_cost,time from dba_hist_sql_plan where sql_id='gmkaj9nz7vyvw';
IDOPERATIONOPTIONSOBJECT_OWNEROBJECT_NAMEOBJECT_TYPEOPTIMIZERCOST BYTES CPU_COST TIME
-------------------- -------------------- ---------- ---------- ------------------------------ -------------------- ---------- ---------- ------------------------------ -------------------- ---------- ---------- ----------
0SELECT STATEMENTALL_ROWS3632
1TABLE ACCESSFULLSCOTTT3TABLE3632836060800816736244
SQL> select t.*,(select sql_text from dba_hist_sqltext where sql_id=t.sql_id) sql_text from (select sql_id,sum(cpu_time_total),sum(cpu_time_delta) from dba_hist_sqlstat group by sql_id order by 2 desc) t where rownum<=5;
SQL_ID SUM(CPU_TIME_TOTAL) SUM(CPU_TIME_DELTA)SQL_TEXT
--------------------------------------------------------------------------------------------- ------------------- -------------------
46hjcvyssg7a2922170810 545961002BEGIN DBMS_SQLPA.execute_analysis_task(task_name=>:sts_task); END;
5hrxg25g8bdpd502210755 308952092INSERT INTO T1 VALUES (S_T1_ID.NEXTVAL,DBMS_RANDOM.STRING('u', 10),SYSDATE)
7j89gjdpf4m4u398767377 265823588
begin
for i in 1 .. 1000000 loop
insert into t1 values (s_t1_id.Nextval,dbms_ran
gmkaj9nz7vyvw324451675 261535240select * from scott.t3 where name=dbms_random.string('u', 10)
a0qbnz3z4x4ns179105773 179105773select * from scott.t1 where name=dbms_random.string('u', 10)
SQL> select id,operation,options,object_owner,object_name,object_type,optimizer,cost,bytes,cpu_cost,time from dba_hist_sql_plan where sql_id='gmkaj9nz7vyvw'；
IDOPERATIONOPTIONSOBJECT_OWNEROBJECT_NAMEOBJECT_TYPEOPTIMIZERCOST BYTES CPU_COST TIME
-------------------- -------------------- ---------- ---------- ------------------------------ -------------------- ---------- ---------- ------------------------------ -------------------- ---------- ---------- ----------
0SELECT STATEMENTALL_ROWS3632
1TABLE ACCESSFULLSCOTTT3TABLE3632836060800816736244
転載先:http://blog.itpub.net/31479729/viewspace-2168961/