*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
2019-12-12 16:28:22 0x7f4376417700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 46 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 76355 srv_active, 0 srv_shutdown, 1224010 srv_idle
srv_master_thread log flush and writes: 1300274
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 84169
OS WAIT ARRAY INFO: signal count 89686
RW-shared spins 0, rounds 163251, OS waits 76444
RW-excl spins 0, rounds 169954, OS waits 3206
RW-sx spins 5500, rounds 104416, OS waits 1866
Spin rounds per wait: 163251.00 RW-shared, 169954.00 RW-excl, 18.98 RW-sx
------------
TRANSACTIONS
------------
Trx id counter 277586568
History list length 16
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 421438799918016, not started
0 lock struct(s), heap size 1136, 0 row lock(s)
-------- #後臺IO線程，innodb後臺線程分爲4種，分別爲Master Thread（後臺核心線程，負責緩衝池數據同步到磁盤等核心任務），IO Thread（負責IO請求回調處理，使用innodb_read_io_threads和innodb_write_io_threads設置），
FILE I/O #Purge Thread（回收事務提交後記錄undolog使用過的undo數據頁，使用innodb_purge_threads設置）和Page Clean Thread（髒頁數據刷新）。
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread) #insert buffer thread用來合併插入緩衝
I/O thread 1 state: waiting for completed aio requests (log thread) #log thread同步事務日誌
I/O thread 2 state: waiting for completed aio requests (read thread) #read thread執行預讀操作
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) #write thread刷新髒頁緩存
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)
Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] , #read thread和write thread掛起操作的數
ibuf aio reads:, log i/o's:, sync i/o's: #insert buffer thread掛起的fsync()操作數等
Pending flushes (fsync) log: 0; buffer pool: 0 #log thread掛起的操作數等
1226812 OS file reads, 1064429 OS file writes, 609327 OS fsyncs #read thread和write thread操作執行數
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 93738, seg size 93740, 0 merges //size表示已經合併的記錄頁數，seg size顯示當前insert buffer的大小93740*16k，free list爲當前空閒鏈表長度
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 9460543, node heap has 20245 buffer(s)
Hash table size 9460543, node heap has 0 buffer(s)
Hash table size 9460543, node heap has 0 buffer(s)
Hash table size 9460543, node heap has 0 buffer(s)
Hash table size 9460543, node heap has 832 buffer(s)
Hash table size 9460543, node heap has 9899 buffer(s)
Hash table size 9460543, node heap has 1 buffer(s)
Hash table size 9460543, node heap has 2 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 1118874928367
Log flushed up to 1118874928367
Pages flushed up to 1118874928367
Last checkpoint at 1118874928358
0 pending log flushes, 0 pending chkp writes
231387 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total large memory allocated 35181821952 #innodb分配的總內存，其中有非常小部分是額外內存池分配
Dictionary memory allocated 395682
Buffer pool size 2096896 #緩存池大小，以頁爲單位2096896*16K約32G
Free buffers 654592 #緩存池空閒大小，以頁爲單位
Database pages 1411325 #LRU鏈表大小，以頁爲單位，包含young區（熱區）和old區（冷區）
Old database pages 521133 #LRU鏈表old區大小，以頁爲單位
Modified db pages 0 #髒數據頁數
Pending reads 0 #掛起數據頁數
Pending writes: LRU 0, flush list 0, single page 0 #掛起寫數據頁數
Pages made young 47, not young 0 #前面是數據從old區移動到young區頭部的次數，後面是因爲沒達到innodb_old_blocks_time的時間限制所以沒有從old區移動到young區頭部的次數
0.00 youngs/s, 0.00 non-youngs/s #表示每秒young和non-youngs這兩類操作的次數
Pages read 1219252, created 192073, written 616536 #innodb的讀取頁（從磁盤讀到緩衝池的數據），創建頁（在緩衝池中分配但沒有從數據文件中讀取內容的頁），寫入頁（或者從緩衝池寫到磁盤中的數據）
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 1411325, unzip_LRU len: 0 #LRU鏈表數據總頁數和壓縮的數據頁總頁數（爲0表示沒有使用壓縮頁）
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
----------------------
INDIVIDUAL BUFFER POOL INFO
----------------------
---BUFFER POOL 0 #此處開始顯示每個緩存池的具體信息，可通過innodb_buffer_pool_instances查看緩存池個數
Buffer pool size 262112
Free buffers 81044
Database pages 177196
Old database pages 65430
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 9, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 153010, created 24186, written 128435
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 177196, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 1
Buffer pool size 262112
Free buffers 83279
Database pages 174960
Old database pages 64604
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 11, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 150664, created 24296, written 42182
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 174960, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 2
Buffer pool size 262112
Free buffers 84503
Database pages 173737
Old database pages 64153
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 7, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 149834, created 23903, written 200088
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 173737, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 3
Buffer pool size 262112
Free buffers 80063
Database pages 178176
Old database pages 65792
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 4, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 154117, created 24059, written 51589
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 178176, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 4
Buffer pool size 262112
Free buffers 78649
Database pages 179592
Old database pages 66314
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 4, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 155093, created 24499, written 46780
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 179592, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 5
Buffer pool size 262112
Free buffers 81791
Database pages 176450
Old database pages 65154
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 5, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 152631, created 23819, written 64964
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 176450, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 6
Buffer pool size 262112
Free buffers 82466
Database pages 175772
Old database pages 64904
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 1, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 152233, created 23539, written 40319
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 175772, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
---BUFFER POOL 7
Buffer pool size 262112
Free buffers 82797
Database pages 175442
Old database pages 64782
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 6, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 151670, created 23772, written 42179
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 175442, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Process ID=11177, Main thread ID=139927904962304, state: sleeping
Number of rows inserted 4785426, updated 1727156, deleted 31277, read 215364889
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
