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.
0
votes
1answer
89 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`) ) ...
2
votes
1answer
160 views
Why my application is blocked infinitely and SQL Server never timeout and kill the deadlock
I have a multi-thread application that can opened more than one database connection to perform database operation. These connections are using the same credential.
Here is a problem, the application ...
5
votes
3answers
2k views
SQL Server 2008 merge statement deadlocking itself
I have the following procedure (SQL Server 2008r2):
create procedure usp_SaveCompanyUserData
@companyId bigint,
@userId bigint,
@dataTable tt_CoUserdata readonly
as
begin
set ...
2
votes
1answer
115 views
SSMS Object Explorer Details causes deadlock while job is running
I have a problem with one of my SQL Server jobs. I've found that while the job is running, SQL Server Management Studio locks up. It always locks up while I'm looking at tables and sprocs within the ...
8
votes
1answer
372 views
Why are there Victimless Entries on the Deadlock Graph?
I am trying to learn how to analyze SQL Server 2008's deadlock graph, and I'm finding alot of entries with an empty <victim-list> node. I don't understand what these entries represent: if there ...
2
votes
1answer
326 views
InnoDB : Deadlock from one reader and one writer
This sort of has me miffed. One query is doing a select that includes a table that is undergoing a heavy UPDATE, but that update takes under 1/2 a second, and there are no other writers to that ...
3
votes
1answer
169 views
All-or-none exclusive lock on 2 SQL tables
My simplistic testing suggested that I can acquire an exclusive lock on 2 tables or postpone acquiring the lock on either until both can be acquired at once by using a query like this:
SELECT ...
1
vote
1answer
526 views
Cannot fetch the rowset from OLE DB provider “SQLNCLI” for linked server X
I am getting this error while doing concurrent read from same table through linked server. Time out setting is alright. When this error happens, I also start getting the following error for the same ...
1
vote
0answers
157 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>
...
3
votes
2answers
386 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 ...
3
votes
3answers
308 views
Why am i getting deadlocks with 1 read and 1 write thread in SQL
if anyone could please help me understand why the following transactions deadlock?
I am providing the 2 transactions and the indexes for each table:
Transaction 1:
SELECT blockId, blockData, ...
1
vote
2answers
460 views
Is problem with parallelism more common today than before? And what issues can arise from paralellism?
This is a very general question so I don't give much specific information. I am more interested in parallelism and its possible drawbacks. Generally I am all for parallelism as something useful and ...
4
votes
2answers
214 views
How do I query only for committed data while avoid a deadlock
I have a system writing batches of queries as transactions (to maintain coherency), these can be sets of 30-100 queries per transaction. These are done on multiple tables
At the same time there are ...
3
votes
3answers
206 views
Does Snapshot Isolation only give you what has been commited? (And General Snapshot Isolation questions.)
So, I have some deadlocking issues.
I have seen two options to resolve it. Add read uncommitted to my db or do Snapshot Isolation and add read committed snapshot.
After doing some research into ...
1
vote
1answer
154 views
apache hang on deadlock
i use code like this to prevent deadlock.
while($retry<3 and $notsone)
{
try
{
$transaction->commit();
$notdone=false;
}
catch
{
$transaction->rollback();
$retry++;
}
}
if ($retry==3)
{
...
1
vote
1answer
240 views
Update and select concurrently running on same set of rows but different indexes are referred?
In multithreaded application where update and select can go simultaneously assuming update is used within transaction. If table has non clustered index and clustered index, what are the chances of ...
0
votes
1answer
65 views
Keeping an eye on contention
In SQL Server, I am using the following command to see blocked sessions:
select * from sys.sysprocesses where blocked>0
This is super. The problem is I need to see what block sessions there ...
4
votes
3answers
2k views
How to make sure that simultaneous INSERT and SELECT on one table won't make a deadlock?
I have the following table in my SQL Server 2008 database:
CREATE TABLE [dbo].[SomeTable]
(
[Id] [bigint] IDENTITY(1,1) NOT NULL,
[Column1] [varchar](30) NOT NULL,
[Column2] [varchar](30) ...
1
vote
2answers
944 views
How do I determine why my stored procedure is getting deadlocked?
We have a stored procedure that our application uses to query data (no write operations are performed). I have the complete staging database copied to my local version of Sql Server developer edition. ...
1
vote
2answers
1k views
Deadlock on Insert/Update
Using SQL Server 2008 R2:
I'm currently attempting to track down the cause of a deadlock issue we have. Not sure where to turn. Here's the setup.
TABLE Scores:
id INT IDENTITY(1,1),
first_name ...
6
votes
1answer
622 views
How are deadlocks detected and reported in an RDBMS?
I was given this essay type question during an interview but did not get the job. The full question was as follows:
How are deadlocks detected and reported in an RDBMS? What are the transaction ...
3
votes
1answer
92 views
Deadlock between two databases
I have my code running online shared hosting provider. Recently I am seeing too many deadlock exception is being thrown. As you know that shared hosting uses the same database server to host all the ...
1
vote
1answer
790 views
Getting deadlock information easily
I know to check for live deadlocks
select * from sys.sysprocesses where blocked>0
However, that is only for deadlocks that are current. How do we check for deadlocks from the say the last 24 hours? ...
3
votes
2answers
490 views
Oracle 11g see transaction or session start time
I want to know when a session or transaction started. The deadlock file doesn't give me this information. Is there some logfile that keeps these records?
I've got a transaction id "TX-1234-abcd", a ...
3
votes
1answer
368 views
Deadlocks in SQL Server
We're currently encountering a problem with out ASP.NET Application that results in deadlocks on the SQL Server database. A bit of background information I can provide is that we rely heavy on AJAX ...
3
votes
1answer
2k views
Oracle 11g hunting down the deadlock, maybe foreign key?
I am trying to understand why a deadlock occurs in my database. The trace tells me that two updates on the same table are locking. In table is the first table to be written to in an transaction, only ...
4
votes
2answers
138 views
Deadlock during Slony uninstall and concurrent access of DB
I am using slony1-2.0.4.rc2 and postgresql-8.4.0-0. I faced a deadlock in the slony uninstall process.
I was trying to uninstall node from a cluster, as per slony's documents this requires access ...
0
votes
1answer
143 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 ...
4
votes
2answers
1k views
How to handle deadlock issue sql server 2008?
I have a simple application.This application update data of a table (B) from another table(A) which is changed every 60 sec. User may read data at any time so creating deadlock. How is this sort of ...
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 ...
2
votes
2answers
247 views
Alternatives to sp_indexoption for Row Locks and Page Locks in SQL Server 2008
Are there better alternatives to setting the Row Locks and Page Locks in SQL Server 2008?
The case here is to set the row and page locks to false on the table. The lock is in effect during a series ...
2
votes
2answers
407 views
SQL Server Deadlock Log Entries
We're analysing a deadlock situation on a SQL Server 2005 database and have set the trace flags 1204 and 1222.
In the resulting logs we're seeing the following line repeatedly:
"Log Viewer could not ...
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 ...
3
votes
2answers
1k views
Shared and IX locks causing deadlock (Sql server)
In my environment, I have 2 tables - Issue and IssuePropertyValues (which has foreign key reference to the Issue table).
Now, we insert values into these 2 tables using the below 2 queries:
INSERT ...
7
votes
2answers
305 views
How does SQL Server determine the order it takes locks in while selecting a table?
I have two stored procedures that are deadlocking when the system is under load. Proc A is selecting from a table while the Proc B is inserting into the same table. The Lock Graph is showing that Proc ...
2
votes
1answer
338 views
mysql replication deadlock slave stopped
I've a master and slave and got the slave stopped with the following error log in slave. I want to fix this and get the two servers on synch and get going again.
111128 8:42:24 [Note] Slave I/O ...
3
votes
1answer
1k views
How to find out what caused the database(DB2) in a locking state
I know how to check the DB is in a lock state or not, but my question is how to find out which query caused the lock on table /db.
IS there any log file getting created if something unexpected ...
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 ...
3
votes
1answer
1k views
How do you read MySQL InnoDB Monitor output?
I am new to DB Administration. I am trying to figure out the cause of deadlock exceptions, but I am unable to make sense of the logs.
The log says that "transaction 1 is rolled back". Why is this the ...
2
votes
2answers
679 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 ...
14
votes
1answer
1k views
Can foreign keys cause deadlocks and hinder READ COMITTED SNAPSHOT?
This is a followup question from: http://stackoverflow.com/questions/7684477/is-it-possible-to-set-transaction-isolation-level-snapshot-automatically
I'm still having deadlock/timout situations in ...
4
votes
2answers
4k views
can I resolve a deadlock with the rowlock hint?
I have a large delete stored proc and I've reproduced a deadlock in a situation where the deletes would not have deleted anything.
It looks like the part of the stored proc that hit a deadlock was ...
8
votes
3answers
8k views
Notification on long-running query or deadlock in SQL Server 2008 R2?
I'd like to know if there is a way to send a notification on deadlock? If so what queries would be required. I understand that SQL Server takes care of deadlocks, I simply would like information on ...
2
votes
1answer
354 views
Locking, deadlocking workaround while process data at the same table
My database has a table: tableX.
Task1 makes intensive INSERTs (1000 records per minute) as records to process and very seldom UPDATEs (1-2 records per minute) as records to recalculate.
At the ...
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 ...
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 ...
3
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 ...
6
votes
4answers
6k views
How to monitor deadlocks
When do you start troubleshooting a SQL Server 2005/2008 deadlocks and how? The alert is turned on SSMS via SQL Server performance condition alert, objects->SQLServer:Locks, Counter->Lock Waits/Sec, ...
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 ...
