mysql>show engine innodb status \G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
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110412 20:45:39 INNODB MONITOR OUTPUT
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Per second averages calculated from the last 33 seconds 下面显示的信息是33秒之前的数据库状态
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BACKGROUND THREAD
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srv_master_thread loops: 1 1_second, 1 sleeps, 0 10_second, 2 background, 2 flush
srv_master_thread logflushand writes: 1
----------
SEMAPHORES
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OS WAIT ARRAY INFO: reservation count 4, signal count 4
Mutex spin waits 1, rounds 30, OS waits 1
RW-shared spins 3, rounds 90, OS waits 3
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter D00
Purge done for trx‘s n:o <0 undo n:o <0
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started, process no 21250, OS thread id 1232701760
MySQL thread id 1, query id 6 localhost root
show engine innodb status
--------
FILE I/O 下面显示了4种IO进程，read和write
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
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)
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, 0] , aio writes: 0 [0, 0, 0, 0] ,
ibuf aio reads: 0, log i/o‘s: 0, sync i/o‘s: 0
Pending flushes (fsync) log: 0; buffer pool: 0
26 OS file reads, 147 OS file writes, 10 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
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INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 276671, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 1588801
Log flushed up to 1588801
Last checkpoint at 1588801
0 pending log writes, 0 pending chkp writes
10 log i/o‘s done, 0.00 log i/o‘s/second
----------------------
BUFFER POOL AND MEMORY 这下面的信息可以看到InnoDB存储引擎缓冲池的使用情况
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 33650
Buffer pool size 8191 表明一共有多少个缓冲帧（buffer frame），每个缓冲帧为16K，缓冲池大小：8191*16/1024≈127M
Free buffers 8048 表示当前空闲的缓冲帧
Database pages 143 表示已经使用的缓冲帧
Old database pages 0
Modified db pages 0 表示脏页的数量
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 15, created 128, written 131
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
LRU len: 143, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
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0 queries inside InnoDB, 0 queries in queue
1 read views open inside InnoDB
Main thread process no. 21250, id 1200699712, state: waiting for server activity
Number of rows inserted 0, updated 0, deleted 0, read 0
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
1 row in set (0.55 sec)
查看innodb版本，read和write线程数
mysql> show variables like ‘innodb_version‘ \G
*************************** 1. row ***************************
Variable_name: innodb_version
Value: 1.1.6
1 row in set (0.00 sec)
mysql> show variables like ‘innodb_%io_threads
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