MySql检测阻塞,锁等待sql

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1分钟内产生binlog大小计算

select @a1:=VARIABLE_VALUE as a1

from information_schema.GLOBAL_STATUS

where VARIABLE_NAME='innodb_os_log_written'

union all

select sleep(60)

union all

select @a2:=VARIABLE_VALUE as a2

from information_schema.GLOBAL_STATUS

where VARIABLE_NAME='innodb_os_log_written';

select round((@a2-@a1)/1024/1024/@@innodb_log_files_in_group) as MB;

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SELECT

p2.`HOST` Blockedhost,

p2.`USER` BlockedUser,

r.trx_id BlockedTrxId,

r.trx_mysql_thread_id BlockedThreadId,

TIMESTAMPDIFF(

SECOND,

r.trx_wait_started,

CURRENT_TIMESTAMP

) WaitTime,

r.trx_query BlockedQuery,

l.lock_table BlockedTable,

m.`lock_mode` BlockedLockMode,

m.`lock_type` BlockedLockType,

m.`lock_index` BlockedLockIndex,

m.`lock_space` BlockedLockSpace,

m.lock_page BlockedLockPage,

m.lock_rec BlockedLockRec,

m.lock_data BlockedLockData,

p.`HOST` blocking_host,

p.`USER` blocking_user,

b.trx_id BlockingTrxid,

b.trx_mysql_thread_id BlockingThreadId,

b.trx_query BlockingQuery,

l.`lock_mode` BlockingLockMode,

l.`lock_type` BlockingLockType,

l.`lock_index` BlockingLockIndex,

l.`lock_space` BlockingLockSpace,

l.lock_page BlockingLockPage,

l.lock_rec BlockingLockRec,

l.lock_data BlockingLockData,

IF (p.COMMAND = 'Sleep', CONCAT(p.TIME,' seconds'), 0) idel_in_trx

FROM

information_schema.INNODB_LOCK_WAITS w

INNER JOIN information_schema.INNODB_TRX b ON b.trx_id = w.blocking_trx_id

INNER JOIN information_schema.INNODB_TRX r ON r.trx_id = w.requesting_trx_id

INNER JOIN information_schema.INNODB_LOCKS l ON w.blocking_lock_id = l.lock_id AND l.`lock_trx_id`=b.`trx_id`

INNER JOIN information_schema.INNODB_LOCKS m ON m.`lock_id`=w.`requested_lock_id` AND m.`lock_trx_id`=r.`trx_id`

INNER JOIN information_schema. PROCESSLIST p ON p.ID = b.trx_mysql_thread_id

INNER JOIN information_schema. PROCESSLIST p2 ON p2.ID = r.trx_mysql_thread_id

ORDER BY

WaitTime DESC;

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

SELECT

p2.`HOST` 被阻塞方host,

p2.`USER` 被阻塞方用户,

r.trx_id 被阻塞方事务id,

r.trx_mysql_thread_id 被阻塞方线程号,

TIMESTAMPDIFF(

SECOND,

r.trx_wait_started,

CURRENT_TIMESTAMP

) 等待时间,

r.trx_query 被阻塞的查询,

l.lock_table 阻塞方锁住的表,

m.`lock_mode` 被阻塞方的锁模式,

m.`lock_type` "被阻塞方的锁类型(表锁还是行锁)",

m.`lock_index` 被阻塞方锁住的索引,

m.`lock_space` 被阻塞方锁对象的space_id,

m.lock_page 被阻塞方事务锁定页的数量,

m.lock_rec 被阻塞方事务锁定行的数量,

m.lock_data 被阻塞方事务锁定记录的主键值,

p.`HOST` 阻塞方主机,

p.`USER` 阻塞方用户,

b.trx_id 阻塞方事务id,

b.trx_mysql_thread_id 阻塞方线程号,

b.trx_query 阻塞方查询,

l.`lock_mode` 阻塞方的锁模式,

l.`lock_type` "阻塞方的锁类型(表锁还是行锁)",

l.`lock_index` 阻塞方锁住的索引,

l.`lock_space` 阻塞方锁对象的space_id,

l.lock_page 阻塞方事务锁定页的数量,

l.lock_rec 阻塞方事务锁定行的数量,

l.lock_data 阻塞方事务锁定记录的主键值,

IF (p.COMMAND = 'Sleep', CONCAT(p.TIME,' 秒'), 0) 阻塞方事务空闲的时间

FROM

information_schema.INNODB_LOCK_WAITS w

INNER JOIN information_schema.INNODB_TRX b ON b.trx_id = w.blocking_trx_id

INNER JOIN information_schema.INNODB_TRX r ON r.trx_id = w.requesting_trx_id

INNER JOIN information_schema.INNODB_LOCKS l ON w.blocking_lock_id = l.lock_id AND l.`lock_trx_id`=b.`trx_id`

INNER JOIN information_schema.INNODB_LOCKS m ON m.`lock_id`=w.`requested_lock_id` AND m.`lock_trx_id`=r.`trx_id`

INNER JOIN information_schema. PROCESSLIST p ON p.ID = b.trx_mysql_thread_id

INNER JOIN information_schema. PROCESSLIST p2 ON p2.ID = r.trx_mysql_thread_id

ORDER BY

等待时间 DESC;

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

# 查找有碎片的表：

select table_schema db, table_name, data_free, engine

from information_schema.tables

where table_schema not in ('information_schema', 'mysql') and data_free > 0;

SELECT TABLE_NAME,(DATA_LENGTH+INDEX_LENGTH)/1024/1024 size_mb,data_free/1024/1024 free_mb,TABLE_ROWS

FROM information_schema.tables where table_schema not in ('information_schema', 'mysql')

and data_free/1024/1024>=1 order by free_mb desc;

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

#找出没有主键的表

Select t.table_schema,t.table_name,t.engine,t.table_rows

From information_schema.tables as t

Left join information_schema.table_constraints as tc

On tc.table_schema=t.table_schema

And tc.table_name=t.table_name

And tc.constraint_type='PRIMARY KEY'

Where t.table_type='BASE TABLE'

And tc.constraint_type is null

And t.table_schema not in ('mysql','performance_schema','information_schema');

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

一些查看数据库中事务和锁情况的常用语句

查看事务等待状况：

select

r.trx_id waiting_trx_id,

r.trx_mysql_thread_id waiting_thread,

r.trx_query waiting_query,

b.trx_id blocking_trx_id,

b.trx_mysql_thread_id blocking_thread,

b.trx_query blocking_query

from

information_schema.innodb_lock_waits w

inner join information_schema.innodb_trx b on b.trx_id = w.blocking_trx_id

inner join information_schema.innodb_trx r on r.trx_id = w.requesting_trx_id;

查看更具体的事务等待状况：

select

b.trx_state,

e.state,

e.time,

d.state as block_state,

d.time as block_time,

a.requesting_trx_id,

a.requested_lock_id,

b.trx_query,

b.trx_mysql_thread_id,

a.blocking_trx_id,

a.blocking_lock_id,

c.trx_query as block_trx_query,

c.trx_mysql_thread_id as block_trx_mysql_tread_id

from

information_schema.innodb_lock_waits a

left join information_schema.innodb_trx b on a.requesting_trx_id = b.trx_id

left join information_schema.innodb_trx c on a.blocking_trx_id = c.trx_id

left join information_schema.processlist d on c.trx_mysql_thread_id = d.id

left join information_schema.processlist e on b.trx_mysql_thread_id = e.id

order by

a.requesting_trx_id;

查看未关闭的事务：

–mysql 5.6

select

a.trx_id,

a.trx_state,

a.trx_started,

a.trx_query,

b.id,

b.user,

b.db,

b.command,

b.time,

b.state,

b.info,

c.processlist_user,

c.processlist_host,

c.processlist_db,

d.sql_text

from

information_schema.innodb_trx a

left join information_schema.processlist b on a.trx_mysql_thread_id = b.id

and b.command = 'sleep'

left join performance_schema.threads c on b.id = c.processlist_id

left join performance_schema.events_statements_current d on d.thread_id = c.thread_id;

–mysql 5.5

select

a.trx_id,

a.trx_state,

a.trx_started,

a.trx_query,

b.id,

b. user,

b. host,

b.db,

b.command,

b.time,

b.state,

b.info

from

information_schema.innodb_trx a

left join information_schema.processlist b on a.trx_mysql_thread_id = b.id

where

b.command = 'sleep';

查看某段时间以来未关闭事务：

select

trx_id,

trx_started,

trx_mysql_thread_id

from

information_schema.innodb_trx

where

trx_started < date_sub(now(), interval 1 minute)

and trx_operation_state is null

and trx_query is null;