sql deadlock

SYS. sysprocesses is an important system view. It is mainly used to locate and solve SQL Server blocking and deadlock. Msdn: contains information about processes running on an SQL server instance. These processes can be client processes or system processes. Main fields in the View: 1. spid: SQL servr

I wrote a stored procedure the other day and used transactions in the stored procedure.CodeComment out to debug and find the error. Suddenly, a table is locked. It turns out that the code for creating the transaction has forgotten to comment out. Solution to table lock in this article.There are many other scenarios that cause a deadlock in the Table. Unlocking is actually very simple. Here is an example: 1. First create a test table: Create Table Tes

I wrote a stored procedure the other day and used transactions in the stored procedure.CodeComment out to debug and find the error. Suddenly, a table is locked. It turns out that the code for creating the transaction has forgotten to comment out. Solution to table lock in this article. In fact, not only will the table be locked as described above, but there are also many scenarios that will cause a deadlock in the Table. Unlocking is actually very si

A deadlock occurs when the data table is manipulated in PL/SQL and is unresponsive for a long time, and when editing data in a table, there is a "record is locked by another user".Below, a brief description of the solution:Step1.pl/sql View Lock:Select T2.username, T2.sid, T2.serial#,t2.logon_timeFrom V$locked_object t1,v$session T2where t1.session_id = T2.sid[Or

Label:Write a stored procedure a few days ago, the stored procedure used a transaction, and then I put some code comments out to debug the wrong, suddenly found a table is locked, the original is the code to create a transaction forget to comment out. This table locks the workaround. In fact, not only the situation described above will lock the table, there are many kinds of scenes will make the table life and Death lock, unlocking is actually very simple, the following with an example to explai

In fact, not only will the table be locked as described above, but there are also many scenarios that will cause a deadlock in the Table. Unlocking is actually very simple. The following example is used to explain:1. First create a test table:Copy codeThe Code is as follows:Create table Test(Tid int identity (1, 1)) 2. Execute the following SQL statement to lock the table:Copy codeThe Code is as follows:SEL

I wrote a stored procedure the other day and used transactions in the stored procedure. Later I commented out some code for debugging and found that a table was locked, I forgot to comment out the code for creating a transaction. Solution to table lock in this article. I wrote a stored procedure the other day and used transactions in the stored procedure. Later I commented out some code for debugging and found that a table was locked, I forgot to comment out the code for creating a transaction.

Pl/SQL deadlock: record is locked by another user due to a problem, I found a solution in a blog. After a try, I found the solution feasible! Www.2cto.com is afraid of poor memory! Also as your own search direction 1. PL/SQL query locks: select t2.username, t2.sid, t2.serial #, t2.logon _ timefrom v $ locked_object t1, v $ session t2where t1.session _ id = t2.sid

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 following methods:1, change the database iso

Label:In today's article I want to demonstrate how missing indexes on tables in SQL Server cause deadlocks (deadlock). To prepare the test scenario, the following code creates 2 tables, and then 2 tables insert 4 records. 1 --Create a table without any indexes 2 CREATE TABLETable13 ( 4Column1INT, 5Column2INT 6 ) 7 GO 8 9 --Insert a few record Ten INSERT intoTable1VALUES(1,1) One INSERT intoTable1VALUES(

In fact, not only the situation described above will lock the table, there are many kinds of scenes that will put the table to lock the life and death, unlock is actually very simple, the following an example to explain: 1 Create a test table first: Copy Code code as follows: CREATE TABLE Test ( TID INT IDENTITY (1,1) ) 2 Execute the following SQL statement to lock the table: Copy Code code as follows: SELECT * from Test

Tags: DDR amp ESC sel EPO system datetime Order AddressViewing with extended events for dynamic viewsSELECT xed.value (' @timestamp ', ' datetime ') as Creation_date, xed.query ('. ') As Extend_event from ( SELECT CAST ([Target_data] as XML) as Target_data from sys.dm_xe_session_ Targets as XT sys.dm_xe_sessions as xs on xs.address = xt.event_session_address WHERE Xs.name = N ' system_health ' and xt.target_name = n ' ring_buffer ' ) as Xml

1. First we need to determine which user is locked in which table. --Query Locked table Select request_session_id spid,object_name (resource_associated_entity_id) tablename A table that contains the SPID and tablename columns is returned after the query. Where the SPID is the process name and TableName is the table name. 2. Knowing which process has locked the table, you need to find the host that locked the table through the process. --Query host name exec sp_who2 ' xxx ' xxx

Tags: des style blog color using OS IO dataDeadlocks are not unfamiliar to DBAs or database developers, and they can be triggered in a variety of ways, and in general, developers of database applications are designed with some considerations in mind to avoid deadlocks. But sometimes because of some special application scenarios such as high-frequency queries, highly concurrent queries due to the potential problems of database design, Some of the hard-to-catch deadlocks can occur to affect the bu

Tags: style blog http io using ar strong data SPTurning on deadlock monitoring in the database collects the deadlock conditions that occur in the database. There are 2 ways to open it:1 Turn on 1222 monitoringExecute SQL statement:DBCC Traceon (1222,-1);Then view the deadlock information in the system log.2 Start

1 first create a test table:Copy the code code as follows:CREATE TABLE Test (TID INT IDENTITY)2 Execute the following SQL statement to lock the table:Copy the code code as follows:SELECT * from Test with (Tablockx)3 You can see which tables in the current library are deadlocked by using the following statement:Copy the code code as follows:SELECT request_session_id spid,object_name (resource_associated_entity_id) tableName from Sys.dm_tran_locks WHERE

four necessary conditions of the joint action produced, so according to the general idea, as long as can break one of them, can effectively avoid the production of deadlocks. The following are the processing that can be made for the four prerequisites: Allows concurrent access to resources. Allow resource deprivation for the process. The resources required for the process to be submitted once. The orderly allocation of resources, that is, access to resources in the

A trigger is triggered only when it is added. The purpose is to limit the ip address to send a text message for three minutes. The Access frequency of this table is very high for a certain period of time, the deadlock occurred during the peak hours today may be caused by the failure to judge the user's cause. Now let's take a look at the user's judgment. The code is roughly as follows: ALTERtrigger [dbo]. [trg_drv_y A trigger is triggered only when it

server|sqlserver| Solution In fact, the deepest cause of all deadlocks is one: resource competitionPerformance One:A User A accesses table A (lock table a) and then accesses table BAnother User B accesses table B (lock table B), and then attempts to access table AAt this point user a because User B has locked table B, it must wait for User B to release table B, to continue, well, his ladyship will have to wait here.The same user B will wait for user A to release form A to continue this deadlock.