------------
1分鍾內產生binlog大小計算
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;
---------------------
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` 被阻塞方用戶,
r.trx_id 被阻塞方事務id,
r.trx_mysql_thread_id 被阻塞方線程號,
TIMESTAMPDIFF(
SECOND,
r.trx_wait_started,
CURRENT_TIMESTAMP
) 等待時間,
r.trx_query 被阻塞的查詢,
l.lock_table 阻塞方鎖住的表,
m.`lock_mode` 被阻塞方的鎖模式,
m.`lock_type` "被阻塞方的鎖類型(表鎖還是行鎖)",
m.`lock_index` 被阻塞方鎖住的索引,
m.`lock_space` 被阻塞方鎖對象的space_id,
m.lock_page 被阻塞方事務鎖定頁的數量,
m.lock_rec 被阻塞方事務鎖定行的數量,
m.lock_data 被阻塞方事務鎖定記錄的主鍵值,
p.`HOST` 阻塞方主機,
p.`USER` 阻塞方用戶,
b.trx_id 阻塞方事務id,
b.trx_mysql_thread_id 阻塞方線程號,
b.trx_query 阻塞方查詢,
l.`lock_mode` 阻塞方的鎖模式,
l.`lock_type` "阻塞方的鎖類型(表鎖還是行鎖)",
l.`lock_index` 阻塞方鎖住的索引,
l.`lock_space` 阻塞方鎖對象的space_id,
l.lock_page 阻塞方事務鎖定頁的數量,
l.lock_rec 阻塞方事務鎖定行的數量,
l.lock_data 阻塞方事務鎖定記錄的主鍵值,
IF (p.COMMAND = 'Sleep', CONCAT(p.TIME,' 秒'), 0) 阻塞方事務空閑的時間
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
等待時間 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;
---------------------------------------------------------------------------
#找出沒有主鍵的表
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');
------------------------------
ySQL中一些查看事務和鎖情況的常用語句
一些查看數據庫中事務和鎖情況的常用語句
查看事務等待狀況：
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;
查看更具體的事務等待狀況：
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;
查看未關閉的事務：
–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';
查看某段時間以來未關閉事務：
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;