show innodb status 在以后的mysql版本將會(huì)被show engine innodb status所替代。

總所周知show engine innodb status是用來(lái)查看當(dāng)前的mysql數(shù)據(jù)庫(kù)中innodb表的相關(guān)狀態(tài)。

1：show engine innodb status。

-----------------------------------+

| Type | Name | Status |

+-----------------------------------------------------------------------

| InnoDB | |

=====================================

101006 5:35:16 INNODB MONITOR OUTPUT

=====================================

Per second averages calculated from the last 41 seconds

----------

SEMAPHORES

----------

OS WAIT ARRAY INFO: reservation count 5, signal count 5

Mutex spin waits 0, rounds 40, OS waits 0

RW-shared spins 10, OS waits 5; RW-excl spins 0, OS waits 0

------------

TRANSACTIONS

------------

Trx id counter 0 840967

Purge done for trx's n:o < 0 840966 undo n:o < 0 0

History list length 11

LIST OF TRANSACTIONS FOR EACH SESSION:

---TRANSACTION 0 0, not started, process no 3574, OS thread id 2982812560

MySQL thread id 2, query id 13 localhost root

show engine innodb status

--------

FILE I/O

--------

I/O thread 0 state: waiting for i/o request (insert buffer thread)

I/O thread 1 state: waiting for i/o request (log thread)

I/O thread 2 state: waiting for i/o request (read thread)

I/O thread 3 state: waiting for i/o request (write thread)

Pending normal aio reads: 0, aio writes: 0,

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

Pending flushes (fsync) log: 0; buffer pool: 0

37 OS file reads, 45 OS file writes, 30 OS fsyncs

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 0, seg size 2,

0 inserts, 0 merged recs, 0 merges

Hash table size 17393, node heap has 1 buffer(s)

0.00 hash searches/s, 0.00 non-hash searches/s

---

LOG

---

Log sequence number 0 451016813

Log flushed up to 0 451016813

Last checkpoint at 0 451016813

0 pending log writes, 0 pending chkp writes

19 log i/o's done, 0.00 log i/o's/second

----------------------

BUFFER POOL AND MEMORY

----------------------

Total memory allocated 13429750; in additional pool allocated 183680

Dictionary memory allocated 22888

Buffer pool size 256

Free buffers 235

Database pages 20

Modified db pages 0

Pending reads 0

Pending writes: LRU 0, flush list 0, single page 0

Pages read 24, created 4, written 37

0.00 reads/s, 0.00 creates/s, 0.00 writes/s

No buffer pool page gets since the last printout

--------------

ROW OPERATIONS

--------------

0 queries inside InnoDB, 0 queries in queue

1 read views open inside InnoDB

Main thread process no. 3574, id 2937031568, 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

2：我們可以創(chuàng)建一個(gè)innodb_monitor的表，將每隔15s的innodb狀態(tài)寫(xiě)入到日志文件中。

create table innodb_monitor(a int)engine=innodb；

當(dāng)我們不需要寫(xiě)入到日志文件中的時(shí)候，直接drop table innodb_monitor即可。

這中方法它是每隔15s搜集一次相關(guān)狀態(tài)。

再次只對(duì)如何查看mysqlstatus做出批注，

顯示的狀態(tài)信息中有很多有用的東西，自己可以慢慢研究，網(wǎng)上也有很多詳細(xì)的說(shuō)明！再次不做贅訴。

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