A situation caused by two or more processes being unable to proceed (and thus release their locks) because they are blocked by locks on resources held by the other process.

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Why does this deadlock occur?

We're using MySQL with the INNODB storage engine. The account table is accessed by two different transactions. We didn't expect a deadlock because only one transaction is holding a lock (2): ...
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110 views

SQL server deadlock graph explained

I am testing a scenario or recurrent request that ends up in executing the following store procedure simultaneously ALTER PROCEDURE [dbo].[clear_class]( @classID [int]) AS BEGIN DELETE FROM ...
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55 views

InnoDB Deadlocks Involving Currency Transactions

We're dealing with InnoDB deadlocks that are affecting our virtual transaction system. LATEST DETECTED DEADLOCK 150210 20:51:03 *** (1) TRANSACTION: TRANSACTION 0 4240405649, ACTIVE 0 sec, process no ...
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204 views

Notification email when deadlock is encountered in Oracle alert log

How to send a notification email when a deadlock is encountered in alert log on any node like the deadlocks encountered below? (an alert any time a deadlock is detected in alert log) Node 1: Mon Sep ...
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94 views

Ordering a sequence of INSERT…SELECT statements to avoid a deadlock

I have the following two tables in a MySQL database: CREATE TABLE `names` ( `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(60) NOT NULL, PRIMARY KEY (`id`), UNIQUE KEY ...
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866 views

exec sp_getapplock - Different behaviour using go or without go

we have a strange behaviour while using sp_getapplock (we tried to use this to solve a problem with a deadlock involving some insert while another session was trying to execute a ALTER SWITCH ...
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1answer
84 views

Multi-victim deadlock in SQL Server

I have been seeing a lot of deadlocks occurring on a system with deadlock graphs similar to this one: I have been advised that it is a multi-victim deadlock but I cannot re-create a deadlock graph ...
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191 views

What do spikes in InnoDB lock structures indicate?

I co-maintain a high traffic site similar to StackExchange. It runs MySQL 5.1 (working on replacing it with MySQL 5.5 or MariaDB). All our tables are InnoDB. MySQL goes down a couple of times a day. ...
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292 views

Deadlock occurring on database, SQL Server 2008R2

Last few days I had major problems with my production site, turns out deadlock occurred, every half an hour maybe 50-60 of them. To do a quick fix in order to keep the site running I set : ...
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609 views

SELECT + INSERT + Query Cache = MySQL lock up

MySQL server seems to constantly lock up and stop responding on certain types of queries and eventually (after couple of minutes of not responding) give up with an error "MySQL server has gone away", ...
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212 views

Concurrent Access causing deadlock on the same table [closed]

Transaction 1 : SELECT distinct column_id from grid where row_id = @P0 Transaction 2 : INSERT INTO grid (grid_id, row_id, column_id) In this table grid grid_id is primary key clustered. ...
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224 views

Why Am I Getting Deadlock - Please Read Trace

can anyone help me? i'm getting deadlock on this trace, i'm using symmetricds and i can't understand why i'm getting a deadlock on a certain table. I'm using sql server 2008 r2, ...
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97 views

Appropriate Action for Dead Locks / Blocking

I've setup my databases so that anytime a procedure is blocked for more than 45 seconds the database notifies the DBA email. Is it bad practice to setup a way to auto kill the process that is doing ...
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302 views

SQL Server 2008 R2 DeadLock on query Notification

for the first time, I'm running into a deadlock on ...The deadlock graph doesn't help me much except the fact the query notification system seems to responsible. <resource-list> ...
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1answer
127 views

Increased server load after InnoDB deadlock

I am using InnoDB instead of MyISAM for a couple of months right now, and it has really optimized my game database-wise. I was aware of the danger of deadlocks, but hadn't had any problems with it, ...
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1answer
2k views

postgres deadlock without explicit locking

I use PostgreSQL 9.2, and I do not use explicit locking anywhere, neither LOCK statement nor SELECT ... FOR UPDATE. However, recently I got ERROR: 40P01: deadlock detected. The query where deadlock ...
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1answer
39 views

How does PostgreSQL decide which query to cancel during deadlock cleanup

I know that PostgreSQL will detect and clear deadlock once it happen by cancelling one of the queries. How does PostgreSQL decide which one to cancel? Is this deterministic or there is some randomness ...
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2answers
89 views

Where deadlock happen in mysql

I am unable to read below logs of mysql after executing SHOW ENGINE INNODB STATUS command. Can anyone please help me out where the deadlock has happen? ------------------------ LATEST DETECTED ...
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303 views

MySQL InnoDB Deadlock For 2 simple insert queries

I have a deadlock for this two insert queries: insert into PlayerClub (modifiedBy, timeCreated, currentClubId, endingLevelPosition, nextClubId, account_id) values (0, '2014-12-23 15:47:11.596', 180, ...
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208 views

Weird deadlock graph

I got a deadlock graph that I cannot completely understand. This is the deadlock graph xml (table names obfuscated, obviously): <?xml version="1.0" encoding="utf-16"?> <deadlock-list> ...
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1answer
253 views

Is UDPLOCK using Row-locks?

I have a UPDATE statement that is using a UPDLOCK inside a DTCTransaction to avoid deadlocks. Now I was wondering. is it locking on a Row-level or on a Table-level?
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308 views

SQL Server 2008R2 - Stored Procedure with 2 updates causing deadlocks

I have a web api web service that calls an authentication stored procedure. This stored procedure calls a different stored procedure that does 1 update: UPDATE ...
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1answer
211 views

ORA-04020 on Oracle SE1 (11.2.0.1)

We've been experiencing some deadlock issues on our Oracle SE1 (11.2.0.1) database server (Red Hat 5/64bit) Seeing ORA-04020 errors in the logs. Is going to 11.2.0.2 the only way to resolve the ...
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227 views

Getting a Deadlock,

I have this code : public void saveItems(List<Pair<Item, MapleInventoryType>> items, int id) throws SQLException { PreparedStatement ps = null; PreparedStatement pse = null; ...
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1answer
453 views

Deadlock from mysqldump --single-transaction, is it possible?

Is it possible to get a deadlock if you ran mysqldump with the argument --single-transaction ? or any other complication ? If it is used to backup a live site with many other querys running at the ...
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1answer
625 views

Oracle transactions deadlock

How to rollback all active transactions on Oracle DB? I execute query and see 4 transcations in ACTIVE status. SELECT * FROM V$TRANSACTION
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523 views

sql server 2005 deadlock error 3930

I am trying to simulate a solution for a deadlock issue happened on our production server. Run this to create a table to be used in 2 and 3. IF (SELECT OBJECT_ID('dbo.MyProduct') ) IS NOT NULL ...
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1answer
61 views

How to create via sql and detect via ERRORLOG SQL Server 2008 Deadlocks

I am designing a monitoring program using HP Sitescope SIS. The goal is detect deadlocks. In doing so, I created a deadlock on an existing but nearly unused SQL Server 2008. I used the following ...
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1answer
104 views

Pessimistic locking worst case

We are using Java EE. And are making an apllication where in the worst case, aloot of message queue messages willl come form the same User. Therefore we are looking on Pessimistic, SELECT FOR UPDATE ...
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3answers
3k views

How to avoid deadlock while updating 2 rows in MySQL

This is a interview problem: There is a perl program that updates the database, and it could run in different processes. One process may execute a transaction like: update row A -> update ...
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1answer
816 views

MySQL InnoDB locking on combined UPDATE-JOIN statements

on querying statements which contain an UPDATE combined with JOIN, we are getting the following errors: Statements writing to a table with an auto-increment column after selecting from another table ...
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1answer
307 views

What would be possible reasons for a DeadLock to occur in Mysql Database?

If some one has a Table structure some thing like this, CREATE TABLE IF NOT EXISTS `domain_source` (`nid` int(11) NOT NULL DEFAULT '0', `domain_id` int(11) NOT NULL DEFAULT '0', PRIMARY KEY (`nid`) ) ...
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48 views

MySQL deadlock in simple table

I'm having a deadlock issue that I don't get. Possibly it's because of the composite index (idSite,timestamp). Maybe it's range locking on it? I have this table: CREATE TABLE `logs` ( `idLog` ...
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51 views

mysql deadlock issues

we are having starnge deadlock issue. We have a deadlock in mysql and it appears conitously when we run engine innodb command. the webserver it is comming from do not exist as we have manually killed ...
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1answer
34 views

Is it possible to have a deadlock in this situation

I am working with SqlServer and Java. I have the following (pseudo) code : begin transaction For each item of a list select the row in db ... update the row End for end transaction ...
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83 views

Deadlocks due to foreign keys (MySQL)

We are in the process of creating a web application using mysql as a data source. We are using spring with hibernate as an ORM framework. We have hundreds of entities with relations (manyToMany \ ...
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1answer
84 views

Scale MySQL trigger for thousands of inserts per seconds

We are using MYSQL database for an Analytics app. I have two table token and token-big (for overview of actual data) both have id(int) unix_starttime(int) unix_endtime(int) details(varchar 256) A row ...
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38 views

Can a critical section cause deadlock in SQL Server? [duplicate]

We get the next ID for our tables from a separate table with two columns, TABLE_NAME and NEXT_ID. We have a stored procedure which reads the NEXT_ID and then adds an increment to the NEXT_ID. The work ...
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1answer
104 views

SQL Server Deadlock on delete

I have a query like this: with xx as ( SELECT [FilePath], ROW_NUMBER() over (partition by [FilePath] order by [FilePath]) as RowNumber FROM [dbo].[foo] ...
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84 views

Please help in understaning DeadLock Graph

<deadlock-list> <deadlock victim="process46d288"> <process-list> <process id="process46d288" taskpriority="0" logused="9968" waitresource="PAGE: 14:1:4468703" ...
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1answer
521 views

Deadlock caused by INSERT trigger - thread looking for lock it already has?

Using MySQL 5.6.17. I have a table with an INSERT trigger that reads values from that table and 4 other tables, combines the results and writes that to a sixth table. Ever since I added this trigger, ...
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33 views

MySQL what is the order of the table lock for this query?

An example query looks like this: INSERT INTO Adventure (sword, fighter, quest) SELECT Swords.id, Fighters.id, Quests.id FROM swords Swords, fighters Fighters, quests Quests WHERE Swords._id = ...
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131 views

How to fix deadlock caused by “X” locks on same resource?

I have the following <resource-list>: <resource-list> <keylock hobtid="72058301601677312" dbid="7" objectname="myDatabase.dbo.TableOne" indexname="PK_TableOne" id="lock2c336fb380" ...
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96 views

InnoDB says I'm in Deadlock when it should not be

I'll do my best to explain the situation. I'm at a complete loss. Preliminaries I'm running a Java Web Application in Tomcat 7.0 using a JDBC Connector to communicate with my MySQL Database. The ...
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0answers
43 views

Is it possible for a SELECT-only stored procedure to deadlock on itself?

Environment is Microsoft SQL Server 2012. Is it possible for a stored procedure consisting exclusively of SELECT statements to deadlock on itself? That is the report I am getting from a vendor for ...
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1answer
430 views

MySQL: Transaction and Deadlock

I have table "tbl_data", where have a lot of rows (3 - 5 million). I have JAVA (*.jar) module from which I INSERT/UPDATE data into this table. If I start *.jar file (for example, "run.jar") and after ...
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458 views

Single DELETE statement deadlocking in Sybase ASE

I've got a fairly straightforward process running on ASE 15.7, that creates rows in two tables and later deletes them. The tables are both configured to use datapages for the locking scheme, and the ...
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126 views

Lock timeouts on a table with two keys, where only one connection writes for a given value of the first key at a time

I have a table user_rollup_message_list that is keyed by (user_id, message_reference). It is a write-heavy table, and gets enough writes that I get many lock timeouts, with a timeout of 50 seconds, ...
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1answer
2k views

Why are these two INSERTs deadlocking? Is it the trigger? What does this deadlock trace 1222 log tell me?

We are seeing intermittent deadlocks in production when receiving multiple simultaneous API requests. Each request basically culminates in an INSERT statement into the same table, which is where we ...
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1answer
1k views

SQL Server 2008, database completely locked

Our database becomes completely locked, and it seems that many tables not related to each other are locked at once. When this happens, it becomes locked for approximately 2 minutes, and when this ...