数据库死锁排查工具

-- 1. 查询死锁
select    
    request_session_id spid,   
    OBJECT_NAME(resource_associated_entity_id) tableName    
from    
    sys.dm_tran_locks   
where    
    resource_type='OBJECT' 
    
-- 2. 查询相关资源
SELECT  
der.[session_id],der.[blocking_session_id],  
sp.lastwaittype,sp.hostname,sp.program_name,sp.loginame,  
der.[start_time] AS '开始时间',  
der.[status] AS '状态',  
dest.[text] AS 'sql语句',  
DB_NAME(der.[database_id]) AS '数据库名',  
der.[wait_type] AS '等待资源类型',  
der.[wait_time] AS '等待时间',  
der.[wait_resource] AS '等待的资源',  
der.[logical_reads] AS '逻辑读次数'  
FROM sys.[dm_exec_requests] AS der  
INNER JOIN master.dbo.sysprocesses AS sp ON der.session_id=sp.spid  
CROSS APPLY  sys.[dm_exec_sql_text](der.[sql_handle]) AS dest  
--WHERE [session_id]>50 AND session_id<>@@SPID  
ORDER BY der.[session_id]  
GO

-- 3. 查询数据库状态
select name,user_access,user_access_desc,
    snapshot_isolation_state,snapshot_isolation_state_desc,
    is_read_committed_snapshot_on
from sys.databases

-- 4. 设置数据库为SINGLE_USER模式,减少锁定时间
ALTER DATABASE dbname SET SINGLE_USER WITH ROLLBACK IMMEDIATE
ALTER DATABASE dbname SET ALLOW_SNAPSHOT_ISOLATION ON
ALTER DATABASE dbname SET READ_COMMITTED_SNAPSHOT ON
ALTER DATABASE dbname SET MULTI_USER


-- 5. 设置session 的锁超时时间，仅对当前session有效
SET LOCK_TIMEOUT 3000 --毫秒ms
/* 1 s = 1000 ms
*/
select @@LOCK_TIMEOUT --默认值为-1，即无超时限制