Mysql中show engine innodb status怎么用

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1. mysql> show engine innodb status\G;
   

2. *************************** 1. row ***************************
   

3.   Type: InnoDB
   

4.   Name:
   

5. Status:
   

6. =====================================
   

7. 2016-11-17 10:20:57 7f5fd92a8700 INNODB MONITOR OUTPUT
   

8. =====================================
   

9. Per second averages calculated from the last 5 seconds
   

10. -----------------
    

11. BACKGROUND THREAD
    

12. -----------------
    

13. srv_master_thread loops: 263748 srv_active, 0 srv_shutdown, 959366 srv_idle
    

14. srv_master_thread log flush and writes: 1223114

15. InnoDB 存儲引擎的核心操作大部分都集中在 Mater Thread 后臺線程中，該狀態顯示了后臺線程狀態信息，Master Thread 的主要工作：

16. 主循環(loop)主要以每一秒和每十秒的頻率執行刷新日志緩存，合并插入緩存，刷新臟頁緩存，刪除無用 undo 頁等操作

17. 如果當前沒有用戶活動，則進入后臺循環流程(backgroud loop)，主要執行刪除無用的 undo 頁，合并插入緩存

18. 如果沒有什么事情可以做了，便進入了暫停循環(suspend loop)，等待事件循環喚起

19. -----------------
    BACKGROUND THREAD
    -----------------
    # srv_active 為每秒的循環次數，srv_idle 為每 10 秒的的循環次數，srv_shutdown 為停止的循環，通常為 0 
    # 如果每秒循環次數少，每 10 秒次數多，證明當前負載很低；如果每秒循環次數多，每 10 秒次數少，遠大于10：1，證明當前負載很高
    srv_master_thread loops: 2818842 srv_active, 0 srv_shutdown, 411 srv_idle
    # 日志緩沖刷盤次數
    srv_master_thread log flush and writes: 2819194

20. ----------
    

21. SEMAPHORES
    

22. ----------
    

23. OS WAIT ARRAY INFO: reservation count 335693
    

24. OS WAIT ARRAY INFO: signal count 7995932
    

25. Mutex spin waits 2260302, rounds 4566188, OS waits 73333
    

26. RW-shared spins 4335920, rounds 14935679, OS waits 171554
    

27. RW-excl spins 209573, rounds 11472909, OS waits 84315
    

28. Spin rounds per wait: 2.02 mutex, 3.44 RW-shared, 54.74 RW-excl
    

29. ------------------------
    

30. LATEST DETECTED DEADLOCK
    

31. ------------------------
    

32. 2016-11-16 14:54:08 7f5fdcd77700
    

33. *** (1) TRANSACTION:
    

34. TRANSACTION 200992143, ACTIVE 2 sec fetching rows
    

35. mysql tables in use 4, locked 4
    

36. LOCK WAIT 1760 lock struct(s), heap size 210472, 339660 row lock(s), undo log entries 1
    

37. MySQL thread id 591553, OS thread handle 0x7f5fdcdb8700, query id 36452144 192.168.10.42 VIPUSER Sending data
    

38. UPDATE pre_order
    

39.                 LEFT JOIN `order` ON `order`.pre_order_id = pre_order.id
    

40.                 LEFT JOIN loan_demand ON loan_demand.id = pre_order.demand_id
    

41.                 LEFT JOIN store_customer  ON store_customer.mobile = pre_order.lender_phone
    

42. 
    

43.                 SET pre_order.saleman_id = 224,
    

44.                  `order`.saleman_id = 224,
    

45.                  loan_demand.saleman_charge = 287,
    

46.                 store_customer.saleman_id=224,
    

47.                 store_customer.update_time = 1479279001
    

48.                 WHERE
    

49.                     `store_customer`.mobile = 18662175906 and pre_order.lender_phone=18662175906 and pre_order.status in( 4)
    

50. *** (1) WAITING FOR THIS LOCK TO BE GRANTED:
    

51. RECORD LOCKS space id 1558 page no 3636 n bits 248 index `PRIMARY` of table `vip`.`store_customer` trx id 200992143 lock_mode X waiting
    

52. Record lock, heap no 141 PHYSICAL RECORD: n_fields 18; compact format; info bits 0
    

53.  0: len 4; hex 00053499; asc   4 ;;
    

54.  1: len 6; hex 00000bfae59a; asc ;;
    

55.  2: len 7; hex a80000015c012a; asc     \ *;;
    

56.  3: len 4; hex 0000000b; asc ;;
    

57.  4: len 4; hex 0000013a; asc :;;
    

58.  5: len 4; hex 00062e65; asc .e;;
    

59.  6: len 11; hex 3135323334313337313233; asc 15234137123;;
    

60.  7: len 1; hex 81; asc ;;
    

61.  8: len 1; hex 02; asc ;;
    

62.  9: len 4; hex 582c028e; asc X, ;;
    

63.  10: len 4; hex 00000000; asc ;;
    

64.  11: len 1; hex 02; asc ;;
    

65.  12: len 1; hex 00; asc ;;
    

66.  13: len 4; hex 00000000; asc ;;
    

67.  14: len 4; hex 00000000; asc ;;
    

68.  15: len 1; hex 00; asc ;;
    

69.  16: len 1; hex 00; asc ;;
    

70.  17: len 1; hex 02; asc ;;
    

71. 
    

72. *** (2) TRANSACTION:
    

73. TRANSACTION 200992154, ACTIVE 2 sec starting index read
    

74. mysql tables in use 1, locked 1
    

75. 13 lock struct(s), heap size 2936, 92 row lock(s), undo log entries 232
    

76. MySQL thread id 592115, OS thread handle 0x7f5fdcd77700, query id 36453180 192.168.10.42 VIPUSER updating
    

77. UPDATE `store_customer` SET `mobile`='13903404842',`store_id`=11,`saleman_id`=314,`pre_order_id`=405131,`is_repeat`=1,`update_time`=1479279248 WHERE ( `id` = 303168 )
    

78. *** (2) HOLDS THE LOCK(S):
    

79. RECORD LOCKS space id 1558 page no 3636 n bits 248 index `PRIMARY` of table `vip`.`store_customer` trx id 200992154 lock_mode X locks rec but not gap
    

80. Record lock, heap no 141 PHYSICAL RECORD: n_fields 18; compact format; info bits 0
    

81.  0: len 4; hex 00053499; asc   4 ;;
    

82.  1: len 6; hex 00000bfae59a; asc ;;
    

83.  2: len 7; hex a80000015c012a; asc     \ *;;
    

84.  3: len 4; hex 0000000b; asc ;;
    

85.  4: len 4; hex 0000013a; asc :;;
    

86.  5: len 4; hex 00062e65; asc .e;;
    

87.  6: len 11; hex 3135323334313337313233; asc 15234137123;;
    

88.  7: len 1; hex 81; asc ;;
    

89.  8: len 1; hex 02; asc ;;
    

90.  9: len 4; hex 582c028e; asc X, ;;
    

91.  10: len 4; hex 00000000; asc ;;
    

92.  11: len 1; hex 02; asc ;;
    

93.  12: len 1; hex 00; asc ;;
    

94.  13: len 4; hex 00000000; asc ;;
    

95.  14: len 4; hex 00000000; asc ;;
    

96.  15: len 1; hex 00; asc ;;
    

97.  16: len 1; hex 00; asc ;;
    

98.  17: len 1; hex 02; asc ;;
    

99. 
    

100. *** (2) WAITING FOR THIS LOCK TO BE GRANTED:
     

101. RECORD LOCKS space id 1558 page no 3206 n bits 288 index `PRIMARY` of table `vip`.`store_customer` trx id 200992154 lock_mode X locks rec but not gap waiting
     

102. Record lock, heap no 33 PHYSICAL RECORD: n_fields 18; compact format; info bits 0
     

103.  0: len 4; hex 0004a040; asc    @;;
     

104.  1: len 6; hex 00000a77948a; asc    w ;;
     

105.  2: len 7; hex 48000001611c78; asc H   a x;;
     

106.  3: len 4; hex 0000000b; asc ;;
     

107.  4: len 4; hex 000000ad; asc ;;
     

108.  5: len 4; hex 0005888d; asc ;;
     

109.  6: len 11; hex 3133393033343034383432; asc 13903404842;;
     

110.  7: len 1; hex 83; asc ;;
     

111.  8: len 1; hex 01; asc ;;
     

112.  9: len 4; hex 581bf514; asc X ;;
     

113.  10: len 4; hex 581bf621; asc X !;;
     

114.  11: len 1; hex 02; asc ;;
     

115.  12: len 1; hex 00; asc ;;
     

116.  13: len 4; hex 00000000; asc ;;
     

117.  14: len 4; hex 00000000; asc ;;
     

118.  15: len 1; hex 00; asc ;;
     

119.  16: len 1; hex 00; asc ;;
     

120.  17: len 1; hex 01; asc ;;
     

121. 
     

122. *** WE ROLL BACK TRANSACTION (2)
     

123. ------------
     

124. TRANSACTIONS
     

125. ------------
     

126. Trx id counter 202747662
     

127. Purge done for trx's n:o < 202747617 undo n:o < 0 state: running but idle
     

128. History list length 2516            ---還有unpurge 2516
     

129. LIST OF TRANSACTIONS FOR EACH SESSION:
     

130. ---TRANSACTION 0, not started
     

131. MySQL thread id 626494, OS thread handle 0x7f5fd92a8700, query id 38472637 127.0.0.1 root init
     

132. show engine innodb status
     

133. --------
     

134. FILE I/O
     

135. --------
     

136. I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
     

137. I/O thread 1 state: waiting for completed aio requests (log thread)
     

138. I/O thread 2 state: waiting for completed aio requests (read thread)
     

139. I/O thread 3 state: waiting for completed aio requests (read thread)
     

140. I/O thread 4 state: waiting for completed aio requests (read thread)
     

141. I/O thread 5 state: waiting for completed aio requests (read thread)
     

142. I/O thread 6 state: waiting for completed aio requests (write thread)
     

143. I/O thread 7 state: waiting for completed aio requests (write thread)
     

144. I/O thread 8 state: waiting for completed aio requests (write thread)
     

145. I/O thread 9 state: waiting for completed aio requests (write thread)
     

146. Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,
     

147.  ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
     

148. Pending flushes (fsync) log: 0; buffer pool: 1
     

149. 117165 OS file reads, 4860463 OS file writes, 3532584 OS fsyncs
     

150. 0.00 reads/s, 0 avg bytes/read, 9.00 writes/s, 9.20 fsyncs/s
     

151. -------------------------------------
     

152. INSERT BUFFER AND ADAPTIVE HASH INDEX
     

153. -------------------------------------
     

154. Ibuf: size 1, free list len 75, seg size 77, 839 merges     ---insert buffer合并插入
     

155. merged operations:
     

156.  insert 373, delete mark 904, delete 130
     

157. discarded operations:
     

158.  insert 0, delete mark 0, delete 0
     

159. Hash table size 4425293, node heap has 7459 buffer(s)
     

160. 37262.35 hash searches/s, 269.75 non-hash searches/s
     

161. ---
     

162. LOG
     

163. ---
     

164. Log sequence number 9856475404
     

165. Log flushed up to   9856475404
     

166. Pages flushed up to 9856471068
     

167. Last checkpoint at  9856470666
     

168. 0 pending log writes, 0 pending chkp writes
     

169. 1186853 log i/o's done, 2.40 log i/o

170. ----------------------  
     BUFFER POOL AND MEMORY
     ---------------------- 
     Total memory allocated 10989076480; in additional pool allocated 0
     Dictionary memory allocated 932159
     Buffer pool size 655352                -----innodb buffer size大小  655353頁*16k
     Free buffers       8505                  ------free 列表中頁的數量
     Database pages     624627                -----lRu列表中頁的數量
     Old database pages 230411                ------lru列表中old list（非熱快數據：5/8-列表最后）的頁的數量
     Modified db pages  26                    ------臟頁，存在于flush list中也存在lru list中，各司其職
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 8034747, not young 844963
     23.47 youngs/s, 0.00 non-youngs/s
     Pages read 78033, created 1790917, written 492746631
     0.00 reads/s, 0.47 creates/s, 42.94 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000                   ------內存命中率這個值應該大于95%，不然sql需要優化啊
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 624627, unzip_LRU len: 0
     ----------------------
     INDIVIDUAL BUFFER POOL INFO
     ----------------------
     ---BUFFER POOL 0
     Buffer pool size   16384
     Free buffers       1025
     Database pages     14428
     Old database pages 5305
     Modified db pages  1
     Pending reads 0
     Pending writes: LRU 0, flush list 1, single page 0
     Pages made young 111884, not young 729335
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 14143, created 18647, written 441843
     0.00 reads/s, 0.00 creates/s, 0.40 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14428, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 1
     Buffer pool size   16384
     Free buffers       1026
     Database pages     14430
     Old database pages 5306
     Modified db pages  0
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 106938, not young 556784
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 13932, created 18419, written 259908
     0.00 reads/s, 0.00 creates/s, 0.20 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14430, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 2
     Buffer pool size   16384
     Free buffers       1025
     Database pages     14414
     Old database pages 5300
     Modified db pages  2
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 111161, not young 408726
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 14114, created 18430, written 406694
     0.00 reads/s, 0.00 creates/s, 0.60 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14414, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 3
     Buffer pool size   16384
     Free buffers       1025
     Database pages     14420
     Old database pages 5303
     Modified db pages  4
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 113167, not young 708499
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 14242, created 18731, written 409053
     0.00 reads/s, 0.00 creates/s, 0.40 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14420, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 4
     Buffer pool size   16384
     Free buffers       1027
     Database pages     14440
     Old database pages 5310
     Modified db pages  0
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 110331, not young 461397
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 14224, created 18645, written 278405
     0.00 reads/s, 0.00 creates/s, 0.20 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14440, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 5
     Buffer pool size   16384
     Free buffers       1024
     Database pages     14425
     Old database pages 5304
     Modified db pages  2
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 108069, not young 370734
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 13755, created 18494, written 233833
     0.00 reads/s, 0.00 creates/s, 0.40 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14425, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 6
     Buffer pool size   16384
     Free buffers       1027
     Database pages     14426
     Old database pages 5305
     Modified db pages  4
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 106842, not young 789185
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 13862, created 18461, written 351585
     0.00 reads/s, 0.00 creates/s, 0.60 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14426, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     ---BUFFER POOL 7
     Buffer pool size   16384
     Free buffers       1025
     Database pages     14426
     Old database pages 5305
     Modified db pages  5
     Pending reads 0
     Pending writes: LRU 0, flush list 0, single page 0
     Pages made young 109852, not young 628401
     0.00 youngs/s, 0.00 non-youngs/s
     Pages read 14021, created 18798, written 336451
     0.00 reads/s, 0.00 creates/s, 0.60 writes/s
     Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
     Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
     LRU len: 14426, unzip_LRU len: 0
     I/O sum[247]:cur[2], unzip sum[0]:cur[0]
     --------------
     ROW OPERATIONS
     --------------
     0 queries inside InnoDB, 0 queries in queue
     0 read views open inside InnoDB
     Main thread process no. 13133, id 140049721313024, state: sleeping
     Number of rows inserted 2464227, updated 569725, deleted 1790, read 56368048059
     1.40 inserts/s, 1.80 updates/s, 0.00 deletes/s, 206769.85 reads/s
     ----------------------------
     END OF INNODB MONITOR OUTPUT
     ============================ 1 row in set (0.00 sec) ERROR: 
     No query specified
     
     

點擊(此處)折疊或打開

1. ----------------------  
   BUFFER POOL AND MEMORY
   ---------------------- 
   Total memory allocated 10989076480; in additional pool allocated 0
   Dictionary memory allocated 932159
   Buffer pool size 655352                -----innodb buffer size大小  655353頁*16k
   Free buffers       8505                  ------free 列表中頁的數量
   Database pages     624627                -----lru列表中頁的數量
   Old database pages 230411                ------lru列表中old list（非熱快數據：5/8-列表最后）的頁的數量
   Modified db pages  26                    ------臟頁，存在于flush list中也存在lru list中，各司其職
   Pending reads 0
   Pending writes: LRU 0, flush list 0, single page 0
   Pages made young 8034747, not young 844963
   23.47 youngs/s, 0.00 non-youngs/s
   Pages read 78033, created 1790917, written 492746631
   0.00 reads/s, 0.47 creates/s, 42.94 writes/s
   Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000                   ------內存命中率這個值應該大于95%，不然sql需要優化啊
   Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
   LRU len: 624627, unzip_LRU len: 0
   

這部分顯示了緩沖池和內存的利用率相關信息。可以看到Innodb分配的所有內存(有些時候可能比你設置的還要多點)，以及額外的內存池分配情況 (可以檢查它的大小是否正好)，緩沖池總共有多少個內存頁，有多少空閑內存頁，數據庫分配了多少個內存頁以及有多少個臟內存頁。從這些信息中，就可以判斷 內存緩沖池是否設定合理，如果總是有大量空閑內存頁，則不需要設置那么多內存，可以適當減小一點。如果空閑內存頁為 0，這種情況下數據庫內存頁就不一定會和緩沖池的總數一致，因為緩沖池還需要保存鎖信息，自適應哈希索引以及其他系統結構等信息。

等待中的讀寫是指內存緩沖池級別的請求。Innodb可能會把多個文件級別的請求合并到一個上，因此各不相同。我們還可以看到Innodb提交的各 種不同類型的IO，LRU內存頁中需要刷新的頁 - 臟內存頁，它們不會被長時間存取；刷新列表 -
檢查點進程處理完之后需要刷新的舊內存頁；獨立內存頁 - 獨立的寫內存頁。

我們還可以看到內存頁總共讀寫了多少次。已經創建的內存頁是當前一個內存頁中的內容沒有讀取到內存緩沖池中時，專門為新數據創建的空內存頁。

最后我們可以看到緩沖池的命中率，它預示著緩沖池的效率。1000/1000 相當于 100% 的命中率。不過這樣也很難說明緩沖池的命中率就足夠高了，這要需要根據不同的負載環境而定。通常情況下，950/1000 就夠了，有些時候在IO負載較高的環境下，命中率可能為 995/1000。

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