Questions tagged [deadlock]

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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21 views

MySQL Dead Lock on Delete Issue

I have recently updated my production code with the new query that is supposed to clean up orphaned records. It runs within the transaction as the last step. And, as a result, I am seeing occasional ...
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Key lock triggered by batch update

I'm doing a batch update operation,but it appears key lock I think I'm in trouble. I don't understand why the deadlock is happening. Environment: SQL Server 2016 deadlock graph detailed: <deadlock-...
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MySQL keeps ignoring MAX_EXECUTION_TIME

I have an instance running which have mysql8 and a nodejs application server. This query keeps popping up and freezing. SELECT /*+ MAX_EXECUTION_TIME(2000) */ COUNT(*) FROM my_table; Even though this ...
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Set the Deadlock Priority to Lowest possible value, but my script is still NOT always the victim in deadlock situations

I have below two queries on Production: Query # 1: Script that deletes older historical data from core table "Table1" based on "Date" column There are ~20 tables that point to &...
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Concurrent Update On Primary Key Column Making Deadlock

I have simple table T which have Col1, Col2,Col3 and Col4. columns. Col1 is primary key. Now I am running some concurrent code, Parallel.For(0, list.Count, new ParallelOptions { MaxDegreeOfParallelism ...
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Deadlock Detection | Should the node T4 point to T1 and T2? [closed]

This example regarding deadlock detection was shown during one of my lectures and I have a doubt about it. The image is shown below. For deadlock detection mechanism, why does T4 point only to T2 and ...
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55 views

Is “deadlock detected” really an error? Should I be suppressing them after handling them?

A while ago, I spent a nightmarish number of weeks dealing with "deadlock detected" and trying to figure out how to handle it. I ended up finally handling it in such a manner that my code is ...
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112 views

Can UPDATE lead to deadlocks in SQL SERVER?

Can we experience deadlock if run the same update query concurrently? Let's assume there's a table with millions of records and we need to update several thousand records at one shot. UPDATE TABLEX ...
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does postgres deadlock if query update and insert in a table inside a function begin? plpgsql

does postgres deadlock if query update and insert in a table inside a function begin? plpgsql function Declare select same table begin update multiple rows same table insert row same table
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How to UPDATE data without locking every record the search encounters?

We have the following database specifications: version: 10.1.47-MariaDB-0ubuntu0.18.04.1 innodb_version: 5.6.49-89.0 tx_isolation: READ-COMMITTED innodb_strict_mode: ON sql_mode: NO_AUTO_CREATE_USER,...
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SQL Server : Deadlock is happening even with small batch size

We have a stored procedure which purges old data. We do the purging on daily basis during off-business hours. Also we do purging in small batches. But in the 5 hour window of purging, we see around 2 ...
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Difference between setting of a shared lock when using INSERT or UPDATE/DELETE statements

I would like to know why a shared lock is set when I use a foreign key on an INSERT statement, but not when I use a foreign key on an UPDATE or DELETE statement. Specifications: version: 10.1.47-...
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deadlock with repeatable read isolation level

Trying to understand deadlock that is occurring with repeatable read isolation level when the stored proc is invoked. This is the deadlock xml : <TextData> <deadlock-list> <...
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Need sample DELETE Query where SQL Server by default takes PAGELOCK instead of ROWLOCK [duplicate]

I need a sample DELETE Query where SQL Server by default takes an X lock at Page Level and not at Row Level. BACKGROUND: In our purging SP, we are using DELETE Query with ROWLOCK hint and I want to ...
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82 views

Why does SQL Server use exclusive locks on the entire table to update one record?

We have problems with deadlocks, judging by the logs, two requests simultaneously want to get exclusive access to the table. However, both queries change one record in the table. The error occurs at ...
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45 views

intra-query parallel thread deadlocks with only Page Locks with snapshot isolation and change tracking

I've been trying to optimise a data loading process. This is on Sqlserver 2016 (13.0.5850.14 - latest SP&CU). I've switched to change tracking for internal database changes and set tablocks on all ...
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56 views

Purging SP getting deadlocked with App…Not able to completed understand Deadlock Graph

We have a stored procedure which purges old data. On a regular basis, it is getting deadlocked with an application stored procedure. Below is the deadlock graph: Deadlock XML: <deadlock> <...
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Is it possible than two simple updates on same table interlocks (deadlock)?

Table A is: id integer version varchar data jsonb (large data 1mb) fkToBid integer (references B.id constraint) Table B is: id integer other... Processes are aggressively running the two updates ...
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Postgres 9.5 deadlock with many updates on a table + many “select for update” on another table

I have two tables: "machines" and "magictools". "magictools" refers to "machines" with a foreign key. I face a deadlock problem while executing many of these ...
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Safe to use WITH (NOLOCK) in this case?

Scenario I have a table that deals with concurrent SELECT's and DELETE's. I'm getting a few deadlocks on my SELECT statements. I assume that the DELETE from the other transaction is getting an ...
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Catch deadlock events in a background job?

I'm currently catching deadlock events with the profiler. (deadlock, deadlock graph, deadlock chain). So far so good, but for this, a client computer needs to be constantly running and online. ==> ...
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Deadlock in MYSQL during SELECT and TRUNCATE

We are regularly getting a deadlock in our application. this requires us to kill the deadlocked queries. We are getting the following error in our logs "Waiting for table metadata lock SELECT&...
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305 views

Deadlock chain, but no deadlock?

I've setup the profiler to catch these deadlock events: Deadlock graph Lock: Deadlock Lock: Deadlock Chain Al available columns are ticked (TextData, LoginName, SPID, etc.) So far, I was able to ...
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55 views

MS SQL Server 2019 - deadlock after row update by primary key, possibly caused by trigger

I've a table: SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[users]( [id] [int] IDENTITY(1,1) NOT NULL, [username] [nvarchar](65) NOT NULL, [nickname] [nvarchar](65) ...
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117 views

Facing deadlock after introducing a new Non-clustered Index on Heap

I am facing a strange issue wherein I had analyzed a stored procedure which runs every 3 minutes and was putting load on CPU. I found out that there are number of select statements which is part of ...
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Why is a Shared lock blocking on an IX lock when Read Committed Snapshot is enabled?

Our system has randomly started deadlocking in areas where it previously had not, and an analysis of the deadlock graph looks like it should not even be happening to begin with. Here is a screenshot ...
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Deadlock and schema modification lock

I have a deadlock that I need some input for <deadlock> <victim-list> <victimProcess id="process4c86a61868" /> </victim-list> <process-list> <process id=&...
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46 views

Can PostgreSQL UPDATEs in autocommit mode deadlock?

Is it possible for UPDATEs in PostgreSQL to deadlock when in autocommit mode? If so, how, and why? (Or, why not?)
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Rolling back transaction with trx_mysql_thread_id of 0 create deadlocks on update

I'm using MySQL 5.6.41 on AWS RDS. I have seen, recently, lot of transactions ending as deadlocks. Using SELECT * FROM information_schema.innodb_trx; I found that a transaction was always there. +-----...
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414 views

Should simultaneous bulk inserts cause deadlocks, with a PK being an identity column, in SQL Server?

When analyzing a deadlock graph, it looks like the victim is a bulk insert, and the blockers are the same bulk insert. Using a message bus, many subscribers can end up doing a bulk insert at roughly ...
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Is my theory on INSERT deadlocks correct?

I originally had this (as three separate PG queries, from my applications): INSERT INTO table1 (col1) VALUES ($1) ON CONFLICT DO NOTHING; INSERT INTO table2 (col1) VALUES ($1) ON CONFLICT DO NOTHING; ...
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(Deadlock) Select Query Causes Insert Query to be Blocking in Transaction

Database: MySQL I have a running app with concurrency transactions in it. I noticed that there are so many errors occur related to deadlock. The error says SQLSTATE[40001]: Serialization failure: 1213 ...
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SQL Sever Transactional Replication on DB with deadlocks and blocking issues

Is it feasible to try and start Transactional Replication on a SQL Server DB with deadlocks and blocking issues. Are there any other options for a close to hot backup?
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InnoDB trigger deadlocks itself?

I have a MySQL 5.7.22 database using the InnoDB engine. There's a table respondents that has 6 associated triggers - three of them make CRUD operations on a completed_respondents table, and the other ...
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34 views

Why do these queries deadlock and how to work this around in MariaDB?

The following 2 queries enounter DB deadlock in my program: DELETE FROM proxies WHERE NOT EXISTS ( SELECT 1 FROM proxy_xref_proxy_list AS pxpl WHERE pxpl.ProxyID=proxies.ID AND (pxpl....
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393 views

MySQL deadlock: upsert query acquiring gap lock twice?

I am trying to debug a deadlock scenario which has been puzzling me for quite some time now. I am wondering if someone can shed any light into how this can happen. Here is the deadlock output: ------...
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Blocking task report is showing false positive

Here is the code I am using to send email alerts. It seems to send more false +ves, can anyone guide me how to resolve this ? DECLARE @Waiting INT; DECLARE @Message NVARCHAR(MAX); SELECT @Waiting =...
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116 views

how see parameter value on xml_deadlock_report

i have some xml_deadlock_report i got from this step management > sessions > system_health > package().even_file but when i see xml_deadlock_report i got sql query but i can't see what parameter use ...
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SQL Deadlock History [duplicate]

What query can I run to display historical deadlocks? I can see the current days deadlocks by going into "Management - Extended Events - system_health - package0.event_file" and looking at the ...
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42 views

Updating column having index causing Deadlock

My update statement: Update XyzTable set state ='second' where pgmNumber = 'prog123' and state = 'first' Both state and pgmNumber columns has individual index. Deadlock is happening even if above ...
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SQL Server Deadlock OPENXML insert

I am running into a deadlock issue when I call a stored procedure in Sql Server 2014 Enterprise Edition. An XML string is passed into the stored procedure and can be called many times in quick ...
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586 views

Transaction (Process ID) was deadlocked on lock resources with another process and has been chosen as the deadlock victim (Msg 1205) when update

I have some issue when i test 100 user fill in attendance with same time. i got error message like this Transaction (Process ID) was deadlocked on lock resources with another process and has ...
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120 views

What is the difference between lock_timeout and deadlock_timeout?

What is the play between lock_timeout and deadlock_timeout ? What is the reason for a lock_timeout to occur not leading to a deadlock timeout. I am not able to think of scenarios from database ...
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34 views

Force update statements to take page locks in the same order?

I have two update statements on the same table that take page locks in different orders. This leads to deadlocks. Process A owns an update lock on page 1, and requests an update lock on page 2. ...
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535 views

MySQL: how to prevent deadlock on concurrent inserts

Percona Server 5.6.39-83.1-log Table structure: CREATE TABLE `myTable` ( `column_1` VARCHAR(50) NOT NULL DEFAULT '', `column_2` VARCHAR(50) NOT NULL DEFAULT '', `column_3` VARCHAR(50) ...
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452 views

MySQL - get latest record when date and time are two fields

I have a DB in which date and time are two columns. I need to get the latest (by latest I mean the record with the highest time) row. This is used as a sub query to feed another query. DB id ...
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115 views

Why do updates to separate sets of rows deadlock?

Update: I have resolved my problem by switching to optimistic locking (SNAPSHOT isolation). The question of why that was necessary in the first place remains unanswered, but I had to move on and thus ...
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139 views

Unable to understand this mysql deadlock log

I am getting a good number of these deadlocks (low % of total requests, but still high in absolute errors). For all the deadlocks, the pattern is very similar; but I am unable to understand why there ...
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90 views

Deadlock debugging with node: log responsible queries

I have a system of many node scripts that read and/or write automatically on a Postgres database all the time. One of those scripts randomly gets a deadlock. I would like to debug this, but the ...
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63 views

SSIS ETL Deadlock (Single Job)

I have a single SSIS Package on the server running via SQL Agent Job. Every now an then we are getting deadlocks issue. I used Breant Ozar's sp_BlitzLock to find out the deadlocks history and got ...

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