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.

learn more… | top users | synonyms

2
votes
1answer
7k views

DB2 Communication link failure issue

I would like to get your valuable suggestions for the below problem. My Perl application connects to a DB2 database and keeps inserting data into a table. The application successfully inserts data ...
2
votes
1answer
1k 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 ...
2
votes
0answers
52 views

Select Query with S lock wins on Insert with IX lock in deadlock

Select Query with S lock wins on Insert with IX lock in deadlock in Sql Server 2008R2. Attaching the deadlock xml file.Please help! http://pastebin.com/nY9EXbS8 This is from the error log by ...
2
votes
0answers
34 views

Index on a highly updated field causing excessive locks in SQL server

I'm in a bit of a conundrum about what the best course of action on this (bad?) index is. I have a table which i use as a notification holder that i watch for database changes with. CREATE TABLE [dbo]...
2
votes
0answers
74 views

SQL Server Check Constraint Lock Order

I'm having problems with SQL Server 2012 filetable. Filetable defines an check constraint on a path_locator field with definition as: /*ParentsAreDirectories*/ (filetable_parents_are_directories((...
2
votes
0answers
85 views

Why is this update creating a deadlock?

I have these queries: (This one was deadlocked) And this one: update tbldealerativacao set flagusado = 0 from tbldealerativacao WITH (NOLOCK) inner join tbldealerusuario WITH (NOLOCK) on ...
2
votes
1answer
221 views

Oracle Ref Partitioning: Deadlock due to child table row migration

My ordering application uses Oracle 11g Database. This DB has a primary table ORDERS and multiple child tables like ORDER_DETAILS, PLAN etc. ORDERS table is LIST partitioned on STATUS column and all ...
2
votes
0answers
172 views

innodb update with limit locks all matching (ignores limit)

For a query similar to this: UPDATE myinnotable1 SET value=5,updated=now(),status=1 WHERE status>10 AND message="match msg" LIMIT 1; I found that innodb engine locks ALL rows matching criteria ...
2
votes
0answers
29 views

Locks while stream reading and deleting/inserting involving the same tables?

I have a question regarding a potential block/lock situation: I am reading data using a select command, which is then modified externally and uploaded to a temporary table. A stored procedure will ...
2
votes
0answers
404 views

Why does a simple select query produce a deadlock? [closed]

I am trying to analyze randomly occurring deadlock problems on an SQL Server 2008 R2 database. The deadlocks occur in very rare cases when SSRS tries to access one of 5 different stored procedures. ...
2
votes
0answers
97 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 ...
2
votes
1answer
104 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 ...
2
votes
0answers
295 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 ...
2
votes
0answers
4k 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 ...
2
votes
0answers
429 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 ...
2
votes
1answer
233 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 ...
1
vote
1answer
2k views

Understanding Deadlock graph on one table

I do not understand this deadlock graph that we are experiencing on this table (I have had to redact the exact column names) I have not had much exposure to deadlocks outside of reading material and ...
1
vote
1answer
101 views

Long running SELECT query fails as deadlock victim to a DELETE on SQL SERVER - Why, and how to avoid this?

Firstly 1 thread selecting a huge amount of data from a table. Then, before the SELECT query is not yet finished, another thread deletes data from that table. It causes SELECT query to failed with ...
1
vote
1answer
111 views

Excessive page locking

There is a query: SELECT entry_id FROM table_name WHERE (path_id = 7 AND value_string = N'00020003-0004-0005-0006-000700080009' ) The table in this query contains some millions of records. Both ...
1
vote
1answer
235 views

How does the table scan in an UPDATE WHERE predicated on an unindexed column work?

I was looking into a deadlock caused by two concurrent UPDATE statements: UPDATE [table] SET [column] = 0 WHERE [unindexed_column] = @id My understanding is that because the column the WHERE is ...
1
vote
3answers
182 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 ...
1
vote
2answers
5k 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
77 views

Select query on an index column with gap locking

I am trying to understand in which cases will a select query make a gap locking on an indexed column select. What I read so far: Select queries use the repeatable read mode in InnoDB and will not ...
1
vote
2answers
399 views

How to force SQL server to use row locking for specific update/delete statements

I read this great response to a similar question How to force the use of row locks but I was looking for a per update/delete statement instead of permanently putting the rowlock restriction on an ...
1
vote
1answer
60 views

Deadlock scenario, where is this S lock coming from?

I am encountering the below deadlock scenario. Please see the attached object definitions and execution plans. The plans were pulled out of cache from a system where this deadlock does occur. I ...
1
vote
1answer
448 views

table partition in order to solve frequent deadlock issues - how would I know if it will work?

I use sql server 2005 enterprise edition and have a subscriber DB - part of a transactional replication - that is used for Business Intelligence purposes - they run reports out of it, and SSIS ...
1
vote
1answer
226 views

MySQL Latest Deadlock Explanation

Can someone explain this deadlock to me? It seems as if there are 2 inserts happening within milliseconds of each other with the same Primary Key. I'm not sure how this can cause a deadlock. At most a ...
1
vote
2answers
271 views

Changing two publications at the same time causes deadlock in distribution database

I have transactional replication setup. Let's say three databases on server A replicate to corresponding three databases on Server B. The databases are identical (same structure for different ...
1
vote
1answer
20 views

Why the deadlock in this scenario?

I was going through the examples of deadlock exceptions online and found this link As I understand, here we have two processes (session 1 and 2). The first one acquires lock on pd1, and second ...
1
vote
2answers
142 views

How many deadlocks am i really getting? system health or deadlocks/sec?

I'm trying to look at deadlocks on a troublesome server, and when I look at the system_health xel file, I see 80 records for "xml_deadlock_report" in about 16 hours. I assume these are all different ...
1
vote
1answer
336 views

Deadlock detected on CREATE TABLE in PostgreSQL

I'm creating multiple tables asynchronously when I get deadlock detected. Both tables (Table A & B) have FK to one table (Table C) and I get deadlock on relation to Table C. Scripts CREATE TABLE ...
1
vote
1answer
300 views

Force index on a delete

UPDATE backup.records FORCE INDEX(IDX_records_deviceId) SET readyToBeDeleted = 1 WHERE deviceId = 226219 AND timestamp <= 1445255546 *** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space ...
1
vote
1answer
146 views

DISABLE / DROP INDEX causing deadlock

Rather urgent one. Have created an index on one of our tables and for some reason all data going into that table has stopped. Can't see any blocking, but when I'm trying to drop or disable the ...
1
vote
1answer
787 views

InnoDB deadlock with INSERT .. SELECT

I am trying to understand why a deadlock occurs when two workers in parallel are running INSERT .. SELECT queries on a table which has both 1) auto incremented primary key, 2) a unique index on ...
1
vote
2answers
314 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; ...
1
vote
1answer
267 views

Deadlock while updating rows and inserting new ones

I'm working with SQL Server 2012 Express Edition and I getting this error: Transaction (Process ID 53) was deadlocked on lock resources with another process and has been chosen as the deadlock victim....
1
vote
1answer
537 views

TRUNCATE in transaction: dead lock

In a unittest we run this: BEGIN; TRUNCATE table1; TRUNCATE table2; ... UPDATE ...; ROLLBACK; Unfortunately this results in a dead lock if a cron job starts and this job operates on table1 and ...
1
vote
1answer
1k views

How does locking work in INSERT..ON DUPLICATE KEY UPDATE statements?

I am encountering deadlocks while trying to update multiple rows (a batch) using INSERT..ON DUPLICATE KEY UPDATE. Does MySQL lock all the rows in one batch or does it lock only the row it is updating ...
1
vote
1answer
388 views

DB2 Insert and Deadlocks

My application has 4 different threads doing inserts into the same DB2 table simultaneously. Could this cause a deadlock / lockwait situtation? Theoretically I don't see a problem here; as one ...
1
vote
1answer
273 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
325 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 ...
1
vote
1answer
10 views

Process possessing lock crashes

I have two machines, M1 and M2, through which I am connecting to MySQL Database on machine M3 using Perl script (DBI.pm). So, here is the scenario that I am confused about: M1 places a table level ...
1
vote
0answers
61 views

NOLOCK vs Read Uncommitted

in our environment, reports are running on the subscriber and resulting in deadlocks with MS Replication SPs, which are doing inserts/updates. What's the best way to eliminate the deadlocks? We have ...
1
vote
1answer
88 views

How do Locks Work in MySQL or MariaDB

There is a case which makes me a bit confused. As far as I understand deadlocks should appear if there are two query statements (including subqueries) in request (each transaction). So the ordering of ...
1
vote
0answers
107 views

How to resolve Innodb lock

I am trying to run a sitemap generator job for Magento and here is what I get as Innodb status after the query has failed to complete even after several hours. I do not know much about DBA stuff and ...
1
vote
0answers
56 views

Is this query actually working?

This is from show engine innodb status ---TRANSACTION 4FF4, ACTIVE 43350 sec, OS thread id 6232 fetching rows mysql tables in use 2, locked 2 480318 lock struct(s), heap size 46578104, 48647170 row ...
1
vote
1answer
51 views

Help understanding InnoDB Deadlock Detection

I have a deadlock occurring when executing an Update and a Select in seperate threads but I'm not sure what can be done about it. Previously my understanding was that this could happen in parallel but ...
1
vote
2answers
236 views

What happens when SELECT … FOR UPDATE returns multiple rows?

I'm working on some dead-lock troubleshooting, particularly involving a row-swap. Currently the statements look like this, all running under the same transaction: SELECT IDENTIFIER FROM tables WHERE ...
1
vote
0answers
61 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` ...
1
vote
0answers
214 views

MySQL - Preventing lock wait timeout when deleting rows from self

I have a table of around 500k rows (not big data), that I need to query against itself and then delete some of the rows which don't match the filters. At the moment my query looks like this: DELETE ...