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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333 views

Deadlock free MERGE-alike in MySQL?

I am trying to implement some parts of MERGE in the MySQL driver in Drupal. Of course, Drupal has something but in truth it only works because the most frequent MERGE issuer just eats exceptions. So, ...
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1answer
253 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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1answer
114 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
47 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
195 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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1answer
331 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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1answer
491 views

Deadlock : Behaviour of NOLOCK

We are running into deadlocks when we run concurrent instances of following query : BEGIN TRAN IF NOT EXISTS (SELECT TOP 1 * FROM Table1 WITH (NOLOCK) WHERE Col1 = Val1 AND Col2 = Val2) BEGIN ...
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0answers
406 views

Trace Flag 1222 Not Working?

I have a customer site with two similarly configured 2008r2 SQL Servers "A" and "C". On both servers the trace flags 1204 and 1222 are enabled and DBCC tracestatus shows the following on both ...
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43 views

When does SQL Server acquire locks?

The list of isolation levels in SQL Server found here states that write locks acquired within a transaction are retained until the end of the transaction. However it doesn't mention anything about ...
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0answers
88 views

Deadlock when CODES table has 41900 rows

I'm having a deadlock accessing the same table from two different jobs. I'm testing it on a SQL SERVER 2012 Enterprise edition. Running SQL Profiler I get this graph: You can find the SQL Server ...
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0answers
236 views

Read-Commited Snaphsot isolation causing deadlocks?

Our DBA has some type of process setup to monitor deadlocks and sends out an emails when a deadlocks occurs. We have been testing read committed snapshot isolation on our application for a couple ...
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0answers
3k views

Oracle Select Query Over Database Link Suddenly Hangs Endlessly

I have a query that's been in use for years and today it started hanging endlessly. I took the query apart and found the piece causing it to hang is a simple join on a primary key that should run like ...
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0answers
379 views

SQL Server 2008 R2 - Deadlock Trace, Need Help Understanding It

I really need help on understanding this deadlock, i've already replaced the values, mind if anyone helps me interpreting where my deadlocks are coming from? What does e_waitpipegetrow mean? btw, i'm ...
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0answers
55 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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0answers
37 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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0answers
85 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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649 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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0answers
73 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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0answers
158 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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0answers
555 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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0answers
214 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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0answers
290 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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0answers
27 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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91 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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0answers
142 views

notification email when deadlock is encountered in alert log,oracle

how to send a notification email when deadlock is encountered in alert log on any node like the deadlocks encounterd below (an alert any time a deadlock is detected in alert log.) Node 1: Mon Sep ...
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75 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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39 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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58 views

Innodb Deadlock During Insert

What could be the reason behind 2 inserts causing a deadlock? Here is what I get from log file: *** (1) TRANSACTION: TRANSACTION 6CA06B9, ACTIVE 6 sec inserting mysql tables in use 1, locked 1 LOCK ...
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394 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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97 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, ...