,net_address,S1=a.spid,s2=0From Master. sysprocesses a Join (Select blocked from master. sysprocesseswhere blocked>0and (@dbid is null or [email protected])Group by blocked) B on a.spid=b.blockedwhere a.blocked=0and (@dbid is null or [email protected])UNION ALLSelect ' |_ victim _> ',Spid,kpid,blocked,dbid,uid,loginame,cpu,login_time,open_tran,Status,hostname,program_name,hostprocess,nt_domain,net_address,S1=blocked,s2=spidFrom Master. sysprocesses Awhere blockedand (@dbid is null or [email prot
Tags:whileentrycas loops serve Blocking selectobjecttran Use [master] GO/****** Object: storedprocedure [dbo]. [Sp_who_lock] script date:07/30/2015 13:52:38 ******/SET ansi_nulls on Go SET quoted_identifier on Go ALTER procedure [dbo]. [Sp_who_lock] as BEGIN declare @spid int, @bl int, @intTransactionCountOnEntry int, NBS P @intRowcount int, @intCountProperties int, @intCount ER int CREATE TABLE #tmp_lock_who (ID int identity (SMALLINT,BL), spid smallint) IF @ @ERROR
Detailed description of SQL Deadlock Detection Methods, detailed description of SQL lock Detection
The deadlock in SQL server refers to the state in which processes are permanently blocked. The following describes how to detect
online transaction processing system, there are two main reasons for the crash. On the one hand, due to the concurrency of multiple users and multi-tasks and the integrity requirements of transactions, when multiple transactions access multiple resources at the same time, if both parties have locked a part of resources but both of them need resources locked by the other party, they will be in an infinite waiting state if they cannot fully obtain the required resources within a limited period of
Deadlock in SQL Server refers to a state of permanent blocking between processes, and the following will show you how to detect SQL Server deadlocks in the hope of helping you.
Deadlock (dead
What is a deadlock?
====================
A deadlock occurs when two system server process IDs (SPIDs) are waiting for a resource and neither process can advance because the other process is preventing it from getting the resource. for example, Andrew holds a lock on table A and requests a lock on table B; Lindsay holds a lock on table B and requests a lock on tab
this time, we can use the following stored procedures to detect the process and SQL statements that cause the deadlock. The built-in system stored procedures sp_who and sp_lock of SQL Server can also be used to find blocking and deadlocks, but the method described here is not easy to use.
Use masterGoCreate procedur
Let's start with an example of this, which can cause deadlocks in SQL Server 2000 and 2005. In this article, I use the latest CTP (Community Technology Preview, Community Technology Preview) version of SQL Server 2005, and the same applies to SQL
Record the deadlock process and solution of the company's warehouse database server, and the warehouse database
Four Conditions for deadlock:
Mutual exclusion: resources cannot be shared and can only be used by one process.
Hold and wait: processes that have obtained resources can apply for new resources again.
No pre-emption: allocated resources cannot be forcib
large transaction, the transaction is too large to allow other sessions to wait for exclusive lock time to become longer
2, everyone is using the same nonclustered index, and scan the Pricingexpressproductcode field
3, the index of repeated values are many
From the above symptoms can be basically judged, this nonclustered index is useless, you can disable the
ALTER INDEX [ix_pricingexpressproductcode_state] on [dbo]. [Orderxxx] DISABLE
After disabling, the
Sessions 1 and Session 2 cannot continue until the other party frees resources. Therefore, SQL Server chooses a session in the deadlock as the "deadlock victim."
Note: The deadlock victim's session will be killed and the transaction will be rolled back.
Note: deadlocks and
('dbcc inputbuffer ('+ @ spid + ')')
If @ sign = 'deadlocked process' exec ('Kill '+ @ spid)
Set @ I = @ I + 1
End
End
Else
While @ I
Begin
Select @ s = 'dbcc inputbuffer ('+ Cast (process ID as varchar) +') 'from # t where id = @ I
Insert # T1 exec (@ s)
Set @ I = @ I + 1
End
Select a. *, the SQL statement of the Process = B. eventinfo
From # t a join # t1 B on A. ID = B. ID
End
Go
Set quoted_identifier off
Go
Set
Select T.username,count (*) from v$session T GROUP by T.username
//Find the sql_id value that a user is executing based on the user group session Select
* From V$session t where T.username = ' BUDGET ' and t.sql_id are NOT NULL
//lookup corresponding SQL_ID's corresponding SQL statement
select M.sql_text from V$session T, V$sqlarea m where t.username = ' BUDGET ' and t.sql_id = m.sql_id
//
SELECT * from V$sqlarea t where T. sql_id = ' G92sy7kwt6mrq '
Label:"SQL Server 2005 deadlock resolution Exploration" mentioned earlier, deadlock severity, an average of one deadlock per day, and a lot of data and ideas in resolving and handling SQL server2005 deadlocks, and then we used the
The use of SQL Server as a database application system, will not be able to sometimes create a deadlock, after the deadlock, the maintenance personnel or developers will mostly only through the sp_who to find the deadlock process, and then killed with Sp_kill. With Sp_who_lo
Find out what's locked up.The slow response of the system means you should do some research. Your search is best started by measuring the number and frequency of locks occurring on the system. If your system environment is highly transactional, it is common for individual applications to compete for resources, which can lead to locking. The key to solving these problems is the ability to identify locked resources and the process of competing for resources.Sp_lockSp_lock This system stored proced
modified is found, the X lock on the resource being modified is required. SQL Server avoids deadlock problems with u locks. Because S-Lock and S-Lock are compatible, the U-Lock and S-lock are compatible to make the update lookup not affect the data lookup, and the U-Lock and U-Lock are not compatible, thus reducing the possibility of
level to be completely isolated, a bit of concurrency ...). Therefore, SQL Server's default read commited is a good choice to strike a balance between isolation and concurrency. SQL Server passes the lock, just like a traffic light at a crossroads, to tell all concurrent connections that at the same time those resources can be read and those resources can be mod
50 methods to skillfully optimize your SQL Server database
There are many reasons for slow query speed. The following are common causes:
1. No index or no index is used (this is the most common problem of slow query and is a defect in programming)
2. Low I/O throughput, resulting in a bottleneck effect.
3. the query is not optimized because no computing column is created.
4. Insufficient memory
5. slow net
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