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.
4
votes
2answers
2k views
Will these two queries result in a deadlock if executed in sequence?
This is almost certainly the cause of my other question, but I thought it was worth separating the two as I have a hypothesis based on the following log that I would love to have falsified or ...
6
votes
2answers
2k views
Trouble deciphering a deadlock in an innodb status log
We are accessing MySQL from the Microsoft ADO.NET connector.
Occasionally we are seeing the following deadlock in our innodb status and haven't been able to identify the cause of the problem. It ...
5
votes
1answer
2k views
Are InnoDB Deadlocks exclusive to INSERT/UPDATE/DELETE?
I am Working around MySQL error "Deadlock found when trying to get lock; try restarting transaction".
I am going to have to update a program to allow deadlocks. Is it possible that SELECT statement ...
2
votes
2answers
681 views
Preventing mysql deadlocks in your php application that uses SELECT… LOCK IN SHARE MODE
If I understand SELECT ... LOCK IN SHARE MODE correctly, you can place it into a mysql transaction to select the rows you will be working with during that transaction.
This is done in order to "lock ...
25
votes
5answers
15k views
What are the main causes of deadlocks and can they be prevented?
Recently one of our ASP.NET applications displayed a database deadlock error and I was requested to check and fix the error. I managed to find the cause of the deadlock was a stored procedure that ...
9
votes
3answers
584 views
Need Help Troubleshooting Sql Server 2005 Deadlock Scenario
I am running into a deadlock scenario where the only participants in the deadlock appear to be a single table and a single stored procedure that deletes from that table. I drew that conclusion based ...
6
votes
1answer
1k views
Deadlock error isn't returning the deadlock SQL
Transaction (Process ID) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. Rerun the transaction.
I am getting this error randomly when one of my ...
5
votes
1answer
2k views
SQL Server Deadlock Graph - Table, Page or Row Lock?
Is there any way to decipher if a lock in a deadlock graph is Table, Page or Row level? I have all the information I need from the graph, including the Isolation Level, (2) but I really want to know ...
3
votes
2answers
391 views
Cannot update certain rows in innodb tables
I found the following on http://dev.mysql.com/doc/refman/5.1/en/innodb-deadlock-detection.html
When InnoDB performs a complete rollback of a transaction, all locks set by the transaction are ...
6
votes
2answers
1k views
MySQL deadlock - cannot restart normally?
MySQL version 5.5.13-1
A snippet from the SHOW ENGINE INNODB STATUS\G:
LATEST DETECTED DEADLOCK
------------------------
111218 10:22:34
*** (1) TRANSACTION:
TRANSACTION 1318D95B, ACTIVE 0 sec ...
0
votes
2answers
128 views
How long can Deadlock info hold in innodb status page?
When I run SHOW ENGINE INNODB STATUS\G, I can see this timestamp
------------------------
LATEST DETECTED DEADLOCK
------------------------
121118 17:14:31
Questions
Any idea how long Deadlock ...
4
votes
3answers
507 views
Is Oracle DB immune to the InnoDB deadlocks found in MySQL?
It seems odd to me that MySQL would not handle this internally: "Deadlock found when trying to get lock; try restarting transaction"
Does Oracle DB work around this issue? After all, Oracle owns ...
1
vote
2answers
773 views
How to analyse innodb status on deadlock in insert Query?
I have a dead lock which i have posted here. I managed to get the innodb status from my server. Here is the Innodb status.
OS WAIT ARRAY INFO: reservation count 247864, signal count 247470
Mutex ...
0
votes
1answer
119 views
How I prevent deadlock occurrence in my application?
I am developing an LMS application in PHP framework(Codeigniter 2.1.0). I am using MySQL database.
All the tables in the database have innodb engine. I also created indexes on each tables.
Now I am ...
0
votes
3answers
129 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 ...
0
votes
2answers
138 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 ...
0
votes
1answer
90 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`) ) ...
