【Mysql】show engine innodb status詳解

小亮520cl發表於2016-03-04
MySql


  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 儲存引擎的核心操作大部分都集中在 Mater Thread 後臺執行緒中，該狀態顯示了後臺執行緒狀態資訊，Master Thread 的主要工作：

  16. 主迴圈(loop)主要以每一秒和每十秒的頻率執行重新整理日誌快取，合併插入快取，重新整理髒頁快取，刪除無用 undo 頁等操作
  17. 如果當前沒有使用者活動，則進入後臺迴圈流程(backgroud loop)，主要執行刪除無用的 undo 頁，合併插入快取
  18. 如果沒有什麼事情可以做了，便進入了暫停迴圈(suspend loop)，等待事件迴圈喚起
  19. -----------------
BACKGROUND THREAD
-----------------
# srv_active 為每秒的迴圈次數，srv_idle 為每 10 秒的的迴圈次數，srv_shutdown 為停止的迴圈，通常為 0 
# 如果每秒迴圈次數少，每 10 秒次數多，證明當前負載很低；如果每秒迴圈次數多，每 10 秒次數少，遠大於10：1，證明當前負載很高
srv_master_thread loops: 2818842 srv_active, 0 srv_shutdown, 411 srv_idle
# 日誌緩衝刷盤次數
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

  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 ; ;

  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 ; ;

  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 ; ;

  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合併插入
  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（非熱快資料：5/8-列表最後）的頁的數量
    Modified db pages  26                    ------髒頁，存在於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                   ------記憶體命中率這個值應該大於95%，不然sql需要最佳化啊
    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


點選( 此處)摺疊或開啟

  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（非熱快資料：5/8-列表最後）的頁的數量
    Modified db pages  26                    ------髒頁，存在於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                   ------記憶體命中率這個值應該大於95%，不然sql需要最佳化啊
    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


這部分顯示了緩衝池和記憶體的利用率相關資訊。可以看到Innodb分配的所有記憶體(有些時候可能比你設定的還要多點)，以及額外的記憶體池分配情況 (可以檢查它的大小是否正好)，緩衝池總共有多少個記憶體頁，有多少空閒記憶體頁，資料庫分配了多少個記憶體頁以及有多少個髒記憶體頁。從這些資訊中，就可以判斷 記憶體緩衝池是否設定合理，如果總是有大量空閒記憶體頁，則不需要設定那麼多記憶體，可以適當減小一點。 如果空閒記憶體頁為 0，這種情況下資料庫記憶體頁就不一定會和緩衝池的總數一致，因為緩衝池還需要儲存鎖資訊，自適應雜湊索引以及其他系統結構等資訊。

等待中的讀寫是指記憶體緩衝池級別的請求。Innodb可能會把多個檔案級別的請求合併到一個上，因此各不相同。我們還可以看到Innodb提交的各 種不同型別的IO，LRU記憶體頁中需要重新整理的頁 - 髒記憶體頁，它們不會被長時間存取；重新整理列表 -
檢查點程式處理完之後需要重新整理的舊記憶體頁；獨立記憶體頁 - 獨立的寫記憶體頁。

我們還可以看到記憶體頁總共讀寫了多少次。已經建立的記憶體頁是當前一個記憶體頁中的內容沒有讀取到記憶體緩衝池中時，專門為新資料建立的空記憶體頁。

最後我們可以看到緩衝池的命中率，它預示著緩衝池的效率。1000/1000 相當於 100% 的命中率。不過這樣也很難說明緩衝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。



來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/29096438/viewspace-2038366/，如需轉載，請註明出處，否則將追究法律責任。

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