如何解決CPU過度消耗問題
問題描述：開發人員報告系統運行緩慢，影響用戶訪問.
1.登陸數據庫主機
使用vmstat檢查，發現CPU資源已經耗盡，大量任務位于運行隊列:
bash-2.03$ vmstat 3
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s6 s9 s1 sd in sy cs us sy id
0 0 055042321464112 0 0 0 0 0 0 0 0 1 1 0 4294967196 0 0 -84 -5 -145
131 0 0 5368072 1518360 56 691 0 2 2 0 0 0 1 0 0 3011 7918 2795 97 3 0
131 0 0 5377328 1522464 81 719 0 2 2 0 0 0 1 0 0 2766 8019 2577 96 4 0
130 0 0 5382400 1524776 67 682 0 0 0 0 0 0 0 0 0 3570 8534 3316 97 3 0
134 0 0 5373616 1520512 127 1078 0 2 2 0 0 0 1 0 0 3838 9584 3623 96 4 0
136 0 0 5369392 1518496 107 924 0 5 5 0 0 0 0 0 0 2920 8573 2639 97 3 0
132 0 0 5364912 1516224 63 578 0 0 0 0 0 0 0 0 0 3358 7944 3119 97 3 0
129 0 0 5358648 1511712 189 1236 0 0 0 0 0 0 0 0 0 3366 10365 3135 95 5 0
129 0 0 5354528 1511304 120 1194 0 0 0 0 0 0 0 4 0 3235 8864 2911 96 4 0
128 0 0 5346848 1507704 99 823 0 0 0 0 0 0 0 3 0 3189 9048 3074 96 4 0
125 0 0 5341248 1504704 80 843 0 2 2 0 0 0 6 1 0 3563 9514 3314 95 5 0
133 0 0 5332744 1501112 79 798 0 0 0 0 0 0 0 1 0 3218 8805 2902 97 3 0
129 0 0 5325384 1497368 107 643 0 2 2 0 0 0 1 4 0 3184 8297 2879 96 4 0
126 0 0 5363144 1514320 81 753 0 0 0 0 0 0 0 0 0 2533 7409 2164 97 3 0
136 0 0 5355624 1510512 169 566 786 0 0 0 0 0 0 1 0 3002 8600 2810 96 4 0
130 1 0 5351448 1502936 267 580 1821 0 0 0 0 0 0 0 0 3126 7812 2900 96 4 0
129 0 0 5347256 1499568 155 913 2 2 2 0 0 0 0 1 0 2225 8076 1941 98 2 0
116 0 0 5338192 1495400 177 1162 0 0 0 0 0 0 0 1 0 1947 7781 1639 97 3 0
2.使用Top命令
觀察進程CPU耗用,發現沒有明顯過高CPU使用的進程
$ top
last pid: 28313; load averages: 99.90, 117.54, 125.71 23:28:38
296 processes: 186 sleeping, 99 running, 2 zombie, 9 on cpu
CPU states: 0.0% idle,96.5% user, 3.5% kernel,0.0% iowait, 0.0%swap
Memory: 4096M real, 1404M free, 2185M swap in use, 5114M swap free
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
27082 oracle8i 1 33 0 1328M 1309M run 0:17 1.29% oracle
26719 oracle8i 1 55 0 1327M 1306M sleep 0:29 1.11% oracle
28103 oracle8i 1 35 0 1327M 1304M run 0:06 1.10% oracle
28161 oracle8i 1 25 0 1327M 1305M run 0:04 1.10% oracle
26199 oracle8i 1 45 0 1328M 1309M run 0:42 1.10% oracle
26892 oracle8i 1 33 0 1328M 1310M run 0:24 1.09% oracle
27805 oracle8i 1 45 0 1327M 1306M cpu/1 0:10 1.04% oracle
23800 oracle8i 1 23 0 1327M 1306M run 1:28 1.03% oracle
25197 oracle8i 1 34 0 1328M 1309M run 0:57 1.03% oracle
21593 oracle8i 1 33 0 1327M 1306M run 2:12 1.01% oracle
27616 oracle8i 1 45 0 1329M 1311M run 0:14 1.01% oracle
27821 oracle8i 1 43 0 1327M 1306M run 0:10 1.00% oracle
26517 oracle8i 1 33 0 1328M 1309M run 0:33 0.97% oracle
25785 oracle8i 1 44 0 1328M 1309M run 0:46 0.96% oracle
26241 oracle8i 1 45 0 1327M 1306M run 0:42 0.96% oracle
3.檢查進程數量
bash-2.03$ ps -ef|grep ora|wc -l
258
bash-2.03$ ps -ef|grep ora|wc -l
275
bash-2.03$ ps -ef|grep ora|wc -l
274
bash-2.03$ ps -ef|grep ora|wc -l
278
bash-2.03$ ps -ef|grep ora|wc -l
277
bash-2.03$ ps -ef|grep ora|wc -l
366
發現系統存在大量Oracle進程,大約在300左右，而正常情況下Oracle連接數應該在100左右.
4.檢查數據庫
查詢v$session_wait獲取各進程等待事件
SQL> select sid,event,p1,p1text from v$session_wait;
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- -------- 124 latch free 1.6144E+10 address
1 pmon timer 300 duration
2 rdbms ipc message 300 timeout
3 rdbms ipc message 300 timeout
11 rdbms ipc message 30000 timeout
6 rdbms ipc message 180000 timeout
4 rdbms ipc message 300 timeout
134 rdbms ipc message 6000 timeout
147 rdbms ipc message 6000 timeout
275 rdbms ipc message 17995 timeout
274 rdbms ipc message 6000 timeout
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- --------
118 rdbms ipc message 6000 timeout
7 buffer busy waits 17 file#
56 buffer busy waits 17 file#
161 buffer busy waits 17 file#
195 buffer busy waits 17 file#
311 buffer busy waits 17 file#
314 buffer busy waits 17 file#
205 buffer busy waits 17 file#
269 buffer busy waits 17 file#
200 buffer busy waits 17 file#
164 buffer busy waits 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- -------
140 buffer busy waits 17 file#
66 buffer busy waits 17 file#
10 db file sequential read 17 file#
18 db file sequential read 17 file#
54 db file sequential read 17 file#
49 db file sequential read 17 file#
48 db file sequential read 17 file#
46 db file sequential read 17 file#
45 db file sequential read 17 file#
35 db file sequential read 17 file#
30 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- -------
29 db file sequential read 17 file#
22 db file sequential read 17 file#
178 db file sequential read 17 file#
175 db file sequential read 17 file#
171 db file sequential read 17 file#
123 db file sequential read 17 file#
121 db file sequential read 17 file#
120 db file sequential read 17 file#
117 db file sequential read 17 file#
114 db file sequential read 17 file#
113 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
111 db file sequential read 17 file#
107 db file sequential read 17 file#
80 db file sequential read 17 file#
222 db file sequential read 17 file#
218 db file sequential read 17 file#
216 db file sequential read 17 file#
213 db file sequential read 17 file#
199 db file sequential read 17 file#
198 db file sequential read 17 file#
194 db file sequential read 17 file#
192 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
188 db file sequential read 17 file#
249 db file sequential read 17 file#
242 db file sequential read 17 file#
239 db file sequential read 17 file#
236 db file sequential read 17 file#
235 db file sequential read 17 file#
234 db file sequential read 17 file#
233 db file sequential read 17 file#
230 db file sequential read 17 file#
227 db file sequential read 17 file#
336 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
333 db file sequential read 17 file#
331 db file sequential read 17 file#
329 db file sequential read 17 file#
327 db file sequential read 17 file#
325 db file sequential read 17 file#
324 db file sequential read 17 file#
320 db file sequential read 17 file#
318 db file sequential read 17 file#
317 db file sequential read 17 file#
316 db file sequential read 17 file#
313 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
305 db file sequential read 17 file#
303 db file sequential read 17 file#
301 db file sequential read 17 file#
293 db file sequential read 17 file#
290 db file sequential read 17 file#
288 db file sequential read 17 file#
287 db file sequential read 17 file#
273 db file sequential read 17 file#
271 db file sequential read 17 file#
257 db file sequential read 17 file#
256 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
254 db file sequential read 17 file#
252 db file sequential read 17 file#
159 db file sequential read 17 file#
153 db file sequential read 17 file#
146 db file sequential read 17 file#
142 db file sequential read 17 file#
135 db file sequential read 17 file#
133 db file sequential read 17 file#
132 db file sequential read 17 file#
126 db file sequential read 17 file#
79 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
77 db file sequential read 17 file#
72 db file sequential read 17 file#
70 db file sequential read 17 file#
69 db file sequential read 17 file#
67 db file sequential read 17 file#
63 db file sequential read 17 file#
55 db file sequential read 17 file#
102 db file sequential read 17 file#
96 db file sequential read 17 file#
95 db file sequential read 17 file#
91 db file sequential read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
81 db file sequential read 17 file#
15 db file sequential read 17 file#
19 db file scattered read 17 file#
50 db file scattered read 17 file#
285 db file scattered read 17 file#
279 db file scattered read 17 file#
255 db file scattered read 17 file#
243 db file scattered read 17 file#
196 db file scattered read 17 file#
187 db file scattered read 17 file#
170 db file scattered read 17 file#
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------
162 db file scattered read 17 file#
138 db file scattered read 17 file#
110 db file scattered read 17 file#
108 db file scattered read 17 file#
92 db file scattered read 17 file#
330 db file scattered read 17 file#
310 db file scattered read 17 file#
302 db file scattered read 17 file#
299 db file scattered read 17 file#
89 db file scattered read 17 file#
5 smon timer 300 sleep time
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ---------
20 SQL*Net message to client 1952673792 driver id
103 SQL*Net message to client 1650815232 driver id
....
148 SQL*Net more data from client 1952673792 driver id
291 SQL*Net more data from client 1952673792 driver id
244 rows selected.
發現存在大量db file scattered read及db file sequential read等待.
5.捕獲相關SQL
這里用到了我的以下腳本getsqlbysid.sql:
SELECT sql_text
FROM v$sqltext a
WHERE a.hash_value = (SELECT sql_hash_value
FROM v$session b
WHERE b.SID = '&sid')
ORDER BY piece ASC
/
SQL> @getsql
Enter value for sid: 18
old 5: where b.sid='&sid'
new 5: where b.sid='18'
SQL_TEXT
----------------------------------------
select i.vc2title,i.numinfoguid from hs_info i where i.intenab
ledflag = 1 and i.intpublishstate = 1 and i.datpublishdate <=
sysdate and i.numcatalogguid = 2047 order by i.datpublishdate d
esc, i.numorder desc
SQL> /
Enter value for sid: 54
old 5: where b.sid='&sid'
new 5: where b.sid='54'
SQL_TEXT
---------------------------------------
select i.vc2title,i.numinfoguid from hs_info i where i.intenab
ledflag = 1 and i.intpublishstate = 1and i.datpublishdate <=
sysdate and i.numcatalogguid = 33 order by i.datpublishdate des
c, i.numorder desc
SQL> /
Enter value for sid: 49
old 5: where b.sid='&sid'
new 5: where b.sid='49'
SQL_TEXT
---------------------------------------
select i.vc2title,i.numinfoguidfrom hs_info i where i.intenab
ledflag = 1 and i.intpublishstate = 1 and i.datpublishdate <=
sysdate and i.numcatalogguid = 26 order by i.datpublishdate des
c, i.numorder desc
對幾個全表掃描進程跟蹤以后，得到以上SQL語句.
以上語句如果良好編碼應該使用綁定變量.但是現在這個不是我們關心的.
使用該應用用戶連接，檢查其執行計劃:
SQL> set autotrace trace explain
SQL> select i.vc2title,i.numinfoguid
2 from hs_info i where i.intenabledflag = 1
3 and i.intpublishstate = 1 and i.datpublishdate <=sysdate
4 and i.numcatalogguid = 3475
5 order by i.datpublishdate desc, i.numorder desc ;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=228 Card=1 Bytes=106)
1 0 SORT (ORDER BY) (Cost=228 Card=1 Bytes=106)
2 1 TABLE ACCESS (FULL) OF 'HS_INFO' (Cost=218 Card=1 Bytes=106)
SQL> select count(*) from hs_info;
COUNT(*)
----------
227404
該表這里有22萬記錄，全表掃描已經不再適合.
檢查該表，存在以下索引:
SQL> select index_name,index_type from user_indexes where table_name='HS_INFO';
INDEX_NAME INDEX_TYPE
------------------------------ ---------------------------
HSIDX_INFO1 FUNCTION-BASED NORMAL
HSIDX_INFO_SEARCHKEY DOMAIN
PK_HS_INFO NORMAL
檢查索引鍵值:
SQL> select index_name,column_name from user_ind_columns where table_name ='HS_INFO';
INDEX_NAME COLUMN_NAME
------------------------------ --------------------
HSIDX_INFO1 NUMORDER
HSIDX_INFO1 SYS_NC00024$
HSIDX_INFO_SEARCHKEY VC2INDEXWORDS
PK_HS_INFO NUMINFOGUID
SQL> desc hs_info
Name Null? Type
----------------------------------- -------- -------------
NUMINFOGUID NOT NULL NUMBER(15)
NUMCATALOGGUID NOT NULL NUMBER(15)
INTTEXTTYPE NOT NULL NUMBER(38)
VC2TITLE NOT NULL VARCHAR2(60)
VC2AUTHOR VARCHAR2(100)
NUMPREVINFOGUID NUMBER(15)
NUMNEXTINFOGUID NUMBER(15)
NUMORDER NOT NULL NUMBER(15)
DATPUBLISHDATE NOT NULL DATE
INTPUBLISHSTATE NOT NULL NUMBER(38)
VC2PUBLISHERID VARCHAR2(30)
VC2INDEXWORDS VARCHAR2(200)
VC2WAPPREVPATH VARCHAR2(200)
VC2WEBPREVPATH VARCHAR2(200)
VC2WAP2PREVPATH VARCHAR2(200)
NUMVISITED NOT NULL NUMBER(15)
INTENABLEDFLAG NOT NULL NUMBER(38)
DATCREATETIME NOT NULL DATE
DATMODIFYTIME NOT NULL DATE
VC2NOTES VARCHAR2(1000)
INTINFOTYPE NOT NULL NUMBER(38)
VC2PRIZEFLAG VARCHAR2(1)
VC2DESC VARCHAR2(1000)
6.決定創建新的索引以消除全表掃描
SQL> create index hs_info_NUMCATALOGGUID on hs_info(NUMCATALOGGUID);
Index created.
SQL> set autotrace trace explain
SQL> select i.vc2title,i.numinfoguid
2 from hs_info i where i.intenabledflag = 1
3 and i.intpublishstate = 1 and i.datpublishdate <=sysdate
4 and i.numcatalogguid = 3475
5 order by i.datpublishdate desc, i.numorder desc ;
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE (Cost=12 Card=1 Bytes=106)
1 0 SORT (ORDER BY) (Cost=12 Card=1 Bytes=106)
2 1 TABLE ACCESS (BY INDEX ROWID) OF 'HS_INFO' (Cost=2 Card=1 Bytes=106)
3 2 INDEX (RANGE SCAN)OF'HS_INFO_NUMCATALOGGUID'(NON-UNIQUE)(Cost=1 Card=1)
7.觀察系統狀況
原大量等待消失
SQL> select sid,event,p1,p1text from v$session_wait where event not like 'SQL%';
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------------
1 pmon timer 300 duration
2 rdbms ipc message 300 timeout
3 rdbms ipc message 300 timeout
6 rdbms ipc message 180000 timeout
59 rdbms ipc message 6000 timeout
118 rdbms ipc message 6000 timeout
275 rdbms ipc message 30000 timeout
147 rdbms ipc message 6000 timeout
62 rdbms ipc message 6000 timeout
11 rdbms ipc message 30000 timeout
4 rdbms ipc message 300 timeout
SID EVENT P1 P1TEXT
---------- ------------------------------ ---------- ------------
305 db file sequential read 17 file#
356 db file sequential read 17 file#
19 db file scattered read 17 file#
5 smon timer 300 sleep time
15 rows selected.
持續觀察的CPU使用情況
bash-2.03$ vmstat 3
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s6 s9 s1 sd in sy cs us sy id
20 0 0 5421792 1503488 38 434 136 0 0 0 0 0 0 2 0 2931 7795 2622 91 9 0
23 1 0 5416080 1500632 95 734 56 0 0 0 0 0 0 0 0 2949 8057 2598 89 11 0
26 0 0 5412016 1498480 210 1170 21 5 5 0 0 0 2 1 0 3301 9647 3116 90 10 0
25 0 0 5394912 1490160 242 1606 56 0 0 0 0 0 0 1 0 3133 9318 2850 89 11 0
40 0 0 5390200 1488112 162 1393 66 0 0 0 0 0 0 0 0 2848 9080 2502 90 10 0
40 0 0 5377120 1481792 136 1180 120 2 2 0 0 0 1 1 0 2846 9099 2593 92 8 0
36 0 0 5363216 1475168 134 1169 53 0 0 0 0 0 3 2 0 2871 7989 2621 88 12 0
39 0 0 5348936 1469160 157 1448 210 0 0 0 0 0 0 0 0 3660 10062 3480 88 12 0
35 0 0 5344552 1466472 7 15 56 0 0 0 0 0 0 0 0 2885 7663 2635 92 8 0
34 0 0 5343016 1465416 44 386 77 0 0 0 0 0 0 0 0 3197 8486 2902 92 8 0
31 0 0 5331568 1459696 178 1491 122 0 0 0 0 0 0 3 0 3237 9461 3005 89 11 0
31 0 0 5317792 1453008 76 719 80 0 0 0 0 0 0 0 0 3292 8736 3025 93 7 0
31 2 0 5311144 1449552 235 1263 69 2 2 0 0 0 1 0 0 3473 9535 3357 88 12 0
25 0 0 5300240 1443920 108 757 18 2 2 0 0 0 1 1 0 2377 7876 2274 95 5 0
19 0 0 5295904 1441840 50 377 0 0 0 0 0 0 0 1 0 1915 6598 1599 98 1 0
----以上為創建索引之前部分
----以下為創建索引之后部分，CPU使用率恢復正常
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr s6 s9 s1 sd in sy cs us sy id
40 1 0 5290040 1439208 315 3894 8 2 2 0 0 0 1 6 0 3631 13414 5206 61 9 30
0 1 0 5237192 1414744 731 6749 45 0 0 0 0 0 2 7 0 3264 13558 4941 52 14 34
0 0 0 5163632 1380608 747 6585 10 0 0 0 0 0 0 1 0 2617 12291 3901 46 12 41
1 0 0 5090224 1348152 712 6079 29 0 0 0 0 0 0 6 0 2825 12416 4178 50 12 39
1 0 0 5023672 1317296 714 6183 24 0 0 0 0 0 0 5 0 3166 12424 4745 47 13 40
0 0 0 4955872 1287136 737 6258 16 0 0 0 0 0 0 3 0 2890 11777 4432 44 12 44
1 0 0 4887888 1256464 809 6234 8 2 2 0 0 0 0 2 0 2809 12066 4247 45 12 43
0 0 0 4828912 1228200 312 2364 13 5 5 0 0 0 2 1 0 2410 6816 3492 38 6 57
0 0 0 4856816 1240168 8 138 0 0 0 0 0 0 1 0 0 2314 4026 3232 34 4 62
0 0 0 4874176 1247712 0 86 0 0 0 0 0 0 0 0 0 2298 3930 3324 35 2 63
2 0 0 4926088 1270824 34 560 0 0 0 0 0 0 0 0 0 2192 4694 2612 29 16 55
0 0 0 5427320 1512952 53 694 0 0 0 0 0 0 3 2 0 2443 5085 3340 33 12 55
0 0 0 5509120 1553136 0 37 0 0 0 0 0 0 0 0 0 2309 3908 3321 35 1 64
0 0 0 5562048 1577000 16 234 0 0 0 0 0 0 0 0 0 2507 5187 3433 35 8 57
0 0 0 5665672 1623848 252 1896 8 2 2 0 0 0 1 0 0 2091 6548 2939 34 5 61
0 0 0 5654752 1618208 5 173 16 0 0 0 0 0 0 0 0 2226 4218 3051 35 4 60
0 0 0 5727024 1651120 28 254 0 0 0 0 0 0 0 0 0 2126 4224 2982 38 2 60
0 0 0 5723184 1648880 93 562 8 2 2 0 0 0 1 1 0 2371 5140 3432 38 3 59
0 0 0 5730744 1652512 7 177 26 2 2 0 0 0 1 0 0 2465 4442 3575 36 3 61
通過上面的操作，問題就得到解決啦，上文有較多的數字，看起來比較復雜，希望大家認真看，相信一定會給大家帶來驚喜。
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