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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15 views

Confusion of Time Stamping Protocol and Two Phase Locking Protocol in schedule

I'm wondering if someone helps me. Actually, I have a little confusion in Concurrency Control Time stamping protocol and Two-Phase locking protocol in a transaction schedule. I have found this ...
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15 views

OLTP to OLAP process causing deadlocks and impacting customers

I should preface this with the fact that I'm a .net developer who has fallen into DBA and performance work because it has become business critical, so I'm missing the DBA skills for this kind of work. ...
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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 ...
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1answer
25 views

Call to sysmail_delete_mailitems_sp keeps deadlocking

I run SQL Server 2012. I have a maintenance job that runs every night. At the end of the maintenance, I do some cleanup and call this: Begin try Exec msdb.dbo.sysmail_delete_log_sp @logged_before = '...
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2answers
36 views

Deadlock resource when try to drop datafile

This morning I did a mistake, I made a datafile offline by using alter tablespace users drop datafile 'C:\ORACLE\ORADATA\ORCL\DATAFILE\O1_MF_USERS_6LD56LRR_.DBF'; The reason is I want to drop that ...
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19 views

MySQL - InnoDB deadlock - simple update query

I am facing deadlock issue in one of our production server, details are as follows: Deadlock info: 160711 10:44:45 *** (1) TRANSACTION: TRANSACTION A89CB314, ACTIVE 2 sec fetching rows mysql tables ...
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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 ...
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42 views

Deadlock during delete in same transaction?

pid basename oid user tx locktype acquired date time query 7592 base 1595014 postgres 363/197025 RowExclusiveLock Yes 2016-06-27 18:19:54+...
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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 ...
2
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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 ...
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31 views

Postgresl database deadlock problem

My Postgresql had following deadlock problem. [2016-06-15 15:38:55.657 MMT] ERROR: deadlock detected [2016-06-15 15:38:55.657 MMT] DETAIL: Process 2488 waits for ShareLock on transaction 1050868701;...
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1answer
67 views

Diagnosing a block in a process that EXECs several layers of stored procedures

Disclaimer: I am a developer. Please be nice to me. I am not the developer that is responsible for what follows. I try to be one of the good ones. I have inherited a support ticket that involves a ...
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37 views

Deadlocking on two update statements

Server Info: Microsoft SQL Server 2005 - 9.00.5057.00 (X64) Standard Edition (Build 7601: Service Pack 1) I have a table called LAB it has about 38 million rows in it. The primary key is a single ...
6
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1answer
680 views

Simulate deadlock with more than 2 processes

How to Simulate deadlock with more than 2 processes in SQL Server test environment? Can someone help me with the code? Just to clarify my question again, I don't want deadlock simulation with only 2 ...
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0answers
35 views

Database tempdb deadlock

I have been getting a deadlock error for a long time : Could somebody please help me as to what kind of deadlock this is and how to resolve the same. Please ask for any additional details if needed....
4
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1answer
63 views

Why would MySQL request a shared-lock after setting transaction level to READ UNCOMMITTED

Running a processing job in multiple parallel batches which basically reads big chunks of rows to update a few - it's OK here to use a lower transaction level since I know the relevant values won't be ...
4
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1answer
54 views

Postgres database deadlock issue

I am using Cloudera Manager to monitor and configure Hadoop. I choose PostgreSQL as metastore of HUE - a web portal to submit your SQL to Hadoop. When I submit a SQL, the HUE says the database is ...
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1answer
91 views

ORA-02049 Timeout: Distributed Transaction Waiting for Lock Solution needed

We are cleaning up the last year's transactions from our primary database. We use public database link to delete the records a day by day from another database. Each days records are around 30-40k, ...
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1answer
82 views

Locking in stored procedures [closed]

If a stored procedure has multiple statements, will the lock acquired for the first statement be released once its executed or will it hold on till entire stored procedure is complete? I am running a ...
3
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0answers
74 views

MySQL queries waiting for other queries to finish

We have 30-40 different projects in Python and PHP that update, insert and select more than 1 million rows of data in MySQL DB every day. Currently we use InnoDB Engine for our tables. The problem: ...
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1answer
68 views

`ON CONFLICT DO UPDATE` causing deadlocks?

I have a project where I'm trying to use the PostgreSQL ON CONFLICT DO UPDATE clause, and I'm having huge numbers of deadlocking issues. My schema is as follows: webarchive=# \d web_pages ...
2
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1answer
76 views

Update with CTE & OUTPUT blocks on concurrent calls

I was having deadlock issues, so I started using this CTE trick that I read somewhere. No more deadlocks. But now each client that I add slows down (blocks?) the sproc. E.g. a 1-2 second update with ...
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1answer
52 views

ORA-24033 : No recipient for message has been detected

I am using Oracle E-business Suite R12.1, 11G database version. Error I encountered when trying to create or modify a user or responsibility: ORA-24033 : no recipient for message has been ...
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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
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1answer
78 views

Why does Deadlock occur for this INSERT/UPDATE combination despite seemingly holding an X lock?

I am regularly seeing deadlocks in a production MySQL 5.5 database but cannot determine exactly what the cause is. For context, we're inserting new records into a database which are triggered by ...
2
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1answer
73 views

Hold exclusive lock on a whole DB

As I explained in Set a filegroup to readonly, I wanna set some tables readonly, to have better performance. These tables are only written by an ETL that runs daily, then they are only read. ...
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1answer
79 views

Database Full Backup fails being deadlock victim

On one of my SQL Server 2008 R2 Databases, Full backup job fails about twice a month due to Deadlocks. Transaction Log backup is only other job which is scheduled to execute at the same time. Can you ...
3
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0answers
112 views

Read/Write Deadlock on Ms-Sql Server

We are facing deadlocks when store procedure is concurrently executed. We are using Microsoft SQL Server 2008 R2, concurrent execution is done with java executing multiple request of sp. I have ...
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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 ...
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0answers
76 views

database Deadlock again

Once again I have a deadlock problem with the following log: [17/03/16 16:42:20.020 -0300] FATAL OPERACIONES: SQLException: CreateEquipo: ERROR: deadlock detected Detail: Process 2923 waits for ...
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1answer
104 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 ...
3
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1answer
60 views

Dead Locks between an insert ignore and and an update

Using MySQL InnoDB. As far as I know and read so many time dead locks only happens when one transaction is locking resource A and waiting for B and another transaction does the opposite. So with ...
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28 views

Resetting deadlock count statistics

It seems that just restarting the PostgreSQL service doesn't clear / reset the detected deadlock count. How can it be restarted to zero? select version(); PostgreSQL 9.4.5 on x86_64-unknown-linux-gnu,...
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2answers
122 views

Where to look for possible deadlock causes?

We've been having several problems the past days in our production environment, and some of them seem to boil down to database issues. Just realized we are having deadlocks (68 actually), on database ...
4
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1answer
81 views

Prevent Deadlocks in Vendor Databases

We have a Windows Update (WSUS) database that is used by Windows Update (obviously). A couple of times a day we will receive deadlocks on this database caused by the WSUS application running 2 update ...
2
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1answer
48 views

How to use two actions and a function in an Extended Events Histogram for deadlocks?

I'd like to get a histogram through extended events that shows the count of deadlocks per databasename by date, but I'm hitting two walls: How get a histogram to include two actions How to get the ...
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105 views

How can I avoid this deadlock in MariaDB?

I saw that I got a deadlock in a MariaDB cluster. I have 3 cluster database. What should I do to avoid that? 160211 16:29:02 *** (1) TRANSACTION: TRANSACTION 75AB6B17, ACTIVE 0 sec starting index ...
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1answer
43 views

SQL db deadlocks [closed]

could any one please tell me how to monitor SQL db deadlocks How to prevent deadlocks How to cancel deadlocks without restarting the service. really highly appreciate your information
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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 ...
2
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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((...
10
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2answers
606 views

Good reasons to use SELECT… WITH XLOCK?

I am facing some re-occurring deadlocks, one of which is a Keylock and contains a SELECT query with XLOCK hint that becomes the deadlock victim. The other statement is an INSERT into one of the tables ...
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108 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 ...
4
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1answer
106 views

Deadlock best practices

We are running Postgres 9.3, and we have occasional deadlock issues. Currently someone notices and will manually kill off the processes. Is there a best practice in dealing with these when they happen?...
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1answer
143 views

SQL Server 2012 - Deadlock happening daily

We have a performance issue with a 3rd-Party application using SQL Server 2012: deadlock happen at least 10 times an hour. The server is virtual server on VMWare 5.5 with PVSCSI adapter in persisted ...
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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 ...
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1answer
49 views

What does this deadlock report from MySQL mean?

Here is the output: ------------------------ LATEST DETECTED DEADLOCK ------------------------ 2015-12-23 05:57:47 7f23d73c6700 *** (1) TRANSACTION: TRANSACTION 32990178, ACTIVE 0 sec inserting mysql ...
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0answers
70 views

mariadb error transaction deadlock

I use galera cluster with 4 nodes, mariadb, we insert nearly 12million data. Insert task was finished. However we have lost 11000 data. I don't know where they go. In error log it writes; 151220 17:...
12
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1answer
387 views

SQL Deadlock on the same exclusively locked clustered Key (with NHibernate) on delete / insert

I have been working on this deadlock issue for quite a few days now and no matter what I do, it persists in one way or another. First, the general premise: We have Visits with VisitItems in a one to ...
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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 ...
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1answer
59 views

Can someone decipher this deadlock for me?

We don't have a real DBA in our shop at this time, I'm filling in the best I can. It looks like the INSERT has taken place first and is holding a lock the SELECT FOR UPDATE needs. But the INSERT is ...