innodb存儲引擎狀態參數

InnoDB存儲引擎層體系結構圖：

1.innodb基本信息

mysql> show engine innodb status \G

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

  Type: InnoDB

  Name: 

Status: 

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2017-01-03 15:34:17 7f916c114700 INNODB MONITOR OUTPUT    --輸出的時間

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Per second averages calculated from the last 38 seconds

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2.後臺線程

BACKGROUND THREAD

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srv_master_thread loops: 2323156 srv_active, 0 srv_shutdown, 2593442 srv_idle  --主線程每秒loop循環的次數(2323156  激活的次數  0  中止的次數  2593442  等待的次數)

srv_master_thread log flush and writes: 4916598      --主線程日誌刷新和寫入的次數

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3.鎖信息

SEMAPHORES

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OS WAIT ARRAY INFO: reservation count 2882668       --全局等待數組信息(當數據組建立後預留的計數)

OS WAIT ARRAY INFO: signal count 59482367          --收到的通知次數

Mutex spin waits 57404086, rounds 70574291, OS waits 688683   --57404086表示互斥等待的個數,70574291表示循環迭帶的個數,688683系統調用的等待個數

RW-shared spins 23269113, rounds 80987143, OS waits 1648604   --23269113表示共享讀鎖期間讀寫鎖等待的個數,80987143表示循環迭帶的個數,1648604系統調用的等待個數

RW-excl spins 3761579, rounds 143069955, OS waits 524639      --3761579表示排它寫鎖期間讀寫鎖等待的個數,80987143表示循環迭帶的個數,1648604系統調用的等待個數

Spin rounds per wait: 1.23 mutex, 3.48 RW-shared, 38.03 RW-excl

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4.事物信息

TRANSACTIONS

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Trx id counter 5381        --下一個事物號

Purge done for trx's n:o < 4553 undo n:o < 0 state: running but idle  --全部編號小於4553的事物都已經從歷史記錄列表中清除了

History list length 75     --歷史列表的長度

LIST OF TRANSACTIONS FOR EACH SESSION:       

---TRANSACTION 0, not started

MySQL thread id 2, OS thread handle 0x7f69957c9700, query id 3 localhost root init

show engine innodb status

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5.文件IO

FILE I/O

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I/O thread 0 state: waiting for completed aio requests (insert buffer thread) --插入緩衝線程

I/O thread 1 state: waiting for completed aio requests (log thread)   --日誌線程

I/O thread 2 state: waiting for completed aio requests (read thread)   --4個異步讀線程

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

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

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

I/O thread 6 state: waiting for completed aio requests (write thread)  --8個異步寫入線程

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

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

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

I/O thread 10 state: waiting for completed aio requests (write thread)

I/O thread 11 state: waiting for completed aio requests (write thread)

I/O thread 12 state: waiting for completed aio requests (write thread)

I/O thread 13 state: waiting for completed aio requests (write thread)

Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0, 0, 0, 0, 0] ,    --每一個讀寫線程狀態(4個讀8個寫)

 ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0     --插入緩衝線程的狀態,每秒日誌IO狀態,IO同步的狀態

Pending flushes (fsync) log: 0; buffer pool: 0      --文件同步的日誌狀態,緩衝池的個數

72539 OS file reads, 27925279 OS file writes, 21542873 OS fsyncs  --讀了多少個文件,系統寫了多少個文件,系統同步了多少個文件

0.00 reads/s, 0 avg bytes/read, 7.50 writes/s, 5.50 fsyncs/s     --每秒讀的信息,平均每秒讀的字節數,每秒寫入的信息,每秒同步的信息

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6.插入緩衝和自適應哈稀索引

INSERT BUFFER AND ADAPTIVE HASH INDEX

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Ibuf: size 1, free list len 488, seg size 490, 3595 merges  --1表示緩衝索引樹的當前大小,488空閒列表的長度,490文件段中已分配段的個數,3595合併頁的個數

merged operations:

 insert 3553, delete mark 168, delete 0   --insert插入緩衝的次數,delete mark標記爲已刪除的次數,delete表示purge的次數(刪除)

discarded operations:

 insert 0, delete mark 0, delete 0      --有多少個insert buffer被丟棄,有多少個insert buffer被標記爲已刪除,purge多少個insert buffer等

Hash table size 9461329, node heap has 8274 buffer(s)     --自適應哈稀索引單元格的數量與預留緩衝結構的數量

21976.71 hash searches/s, 1793.98 non-hash searches/s     --使用哈稀索引的數量與不能使用哈稀索引時向下搜索B樹索引的次數

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7.重作日誌信息

LOG

---

Log sequence number 24627115613       --當前重作日誌序列號

Log flushed up to   24627115603      --刷新到重作日誌文件的序列號

Pages flushed up to 24627105147       --刷新到磁盤的日誌序列號

Last checkpoint at  24627105147      --下一個日誌序列號

0 pending log writes, 0 pending chkp writes   --掛起日誌寫入數,掛起檢查點寫入數

8868627 log i/o's done, 2.63 log i/o's/second  --innodb啓動後的io個數,最近一次顯示以後的每秒io操做個數

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8.緩存池和內存

BUFFER POOL AND MEMORY

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Total memory allocated 4395565056; in additional pool allocated 0     --分配內存總數和額外的內存池

Dictionary memory allocated 961282    --數據字典佔用的字節數

Buffer pool size   262134         --緩衝池的個數    

Free buffers       142352        --剩餘緩衝區的個數

Database pages     111508         --LRU中數據頁的個數

Old database pages 41039           --LRU中舊數據頁的個數

Modified db pages  37            --LRU中已修改的數據頁個數

Pending reads 0        --掛起讀操做的個數

Pending writes: LRU 0, flush list 0, single page 0   --經過使用LRU算法等待刷新的頁數,在BUF_FLUSH_LIST列表等待刷新的頁數,在BUF_FLUSH_SINGLE_PAGE等待刷新的頁數

Pages made young 504766, not young 550   --504766第一次訪問變成新頁面的次數,550沒有變成新頁面的次數

0.05 youngs/s, 0.00 non-youngs/s       --LRU中每秒變成新頁面的速率,沒有變成新頁面的速率

Pages read 71261, created 40267, written 14051008    --71261讀操做的頁面個數,40267在緩衝池中建立了沒有讀取的頁面個數,14051008寫操做的頁面個數

0.00 reads/s, 0.00 creates/s, 3.82 writes/s          --LRU中每秒讀取數據的頁速率,每秒建立數據的頁速率,每秒寫入數據的頁速率

Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000   --讀取頁面數與得到緩衝池頁面的比例,變爲新頁面的頁面數與得到緩衝池頁面的比例,沒有變

爲新頁面的頁面數與得到緩衝池頁面的比例

Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s  --預讀的速率,不經過訪問剔除的預讀頁面的個數

LRU len: 111508, unzip_LRU len: 0       --LRU列表長度,unzip_LRU列表長度

I/O sum[978]:cur[0], unzip sum[0]:cur[0]  --LRU在LRU列表中I/O操做的次數,unzip在LRU列表中I/O操做的次數

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9.行操做

ROW OPERATIONS

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0 queries inside InnoDB, 0 queries in queue   --有多少個正在查詢操做個數

0 read views open inside InnoDB           --顯示只讀視圖的數量

Main thread process no. 9822, id 140262664857344, state: sleeping  --顯示主線程的ID及其狀態  

Number of rows inserted 2044551, updated 2917695, deleted 411325, read 319298239254 --從innodb存儲引擎啓動後插入,更新,刪除,查詢的行數

0.45 inserts/s, 0.79 updates/s, 0.11 deletes/s, 136529.62 reads/s  --最近一次顯示增,刪,改,查的速率

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END OF INNODB MONITOR OUTPUT

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1 row in set (0.00 sec)

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