Questions tagged [tempdb]
TempDB is part of MS SQL Server. It's a system database that functions as a storage area for temporary tables, internal objects and row versions.
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Is the role of "tempdb" in SQL Server similar to that of "swap" in MySQL and Linux?
do we have the "tempdb" concept in other database technologies or it is just in SQL Server.
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Difference between forwarded_fetch_count and forwarded_record_count
I have been scratching my head, re-reading MSFT help and I still cannot understand the difference between forwarded_fetch_count and forwarded_record_count in sys.dm_db_index_operational_stats and sys....
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TempDB GAM contention for SELECT queries
I have problem manifesting itself in following fashion, my TempDB knowledge does not cover this (yet):
An analytical query, that runs in SSMS for about 200ms, keeps running on SQL server, when ...
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Why is error message stating TEMPDB has insufficient disk space in filegroup 'DEFAULT' when my TEMPDB filegroup is named 'PRIMARY'
I have a remote user getting this error message when running a query.
Could not allocate a new page for database 'TEMPDB' because of
insufficient disk space in filegroup 'DEFAULT'. Create the ...
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tempdb data files don't shrink
Our tempdb used 99% of all available space on disk, but DBCC SHRINKFILE doesn't help.
This is how much disk space tempdb files take:
But when I check how much space is really used, I see this:
I ...
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What's the issue with keeping a SQL Server login's default database as 'master'
I've read recommendations to switch non-sysadmins login's default database to something other than master. Tempdb is often recommended.
If a login/user has no permissions by default for their default ...
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Transaction aborted when accessing versioned row in table 'dbo.sysmail_profile' in database 'msdb'
I'm having some problens with SQL Database mail, basicaly anything that I try to do gives me an error like this one below:
Transaction aborted when accessing versioned row in table 'dbo....
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How does shrinking of tempdb log file work?
On the following documentation page:
https://learn.microsoft.com/en-us/sql/relational-databases/databases/shrink-tempdb-database?view=sql-server-ver16
It states that:
Assume that tempdb has two files:...
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Does ALLOW SNAPSHOT ISOLATION need to be set on Tempdb itself?
I'm in a debate over whether you also need to set ALLOW SNAPSHOT ISOLATION on tempdb itself, or only on user databases for the functionality to kick in (in addition to code referencing this)?
Most ...
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How To Optimize a Query That Aggregates Then Duplicates a Large Number of Records in a Single Table
In the following post, J.D. brings up that I have a poorly performing query.
I am running this query on SQL Server 2019 Standard Edition (query plan was generated in Development Edition)
Let's take a ...
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AWS to Azure Degraded Performance With "Hash Match (Aggregate) Step"/"Temporary Disk" TempDB Performance Issue
Ok, so I have a series of AWS VM's, mostly using the z1d.3xlarge server class with built in SQL Server 2019, these servers each contain a NVMe of various size. (Not surprisingly) I've placed my SQL ...
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Can pregrowing tempdb hurt performance?
Late yesterday afternoon I added 4 tempdb data files to the existing 4 for a total of 8 (16 processors on the SQL server). I also pre-grew them to near 100% of the available space.
Today I'm contacted ...
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Are tempdb allocations released after transaction is commited?
In addition to this I am again wondering if the code in a transaction and loop release the tempdb allocations. For the template below:
SET NOCOUNT ON;
WHILE EXISTS(....)
BEGIN
BEGIN TRY;
...
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Tempdb Log is FULL [duplicate]
So my tempdb log has 0% free when I checked my Disk Management in my windows server, I went to SSMS and checked the disk usage report GUI and it shows me that my transaction log is 99% free and the ...
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High parallel tempdb disk usage
We recently added some secondary tempdb files to reduce allocation contention, this seems to have worked; however we are now getting lots of slowdowns related to I/O (WRITELOG and SQLTRACE_FILE_BUFFER ...
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Service Broker enabled on tempdb in SQL Server
I am seeking an answer what might me the reason/scenario to have Service Broker enabled on tempdb. I have a legacy SQL Server and it is enabled there. Is it safe to disable it? Is it possible to ...
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Long TRUNCATE operations
On Microsoft SQL Server 2019, there is a lot of long temp tables TRUNCATE operations with time over 5..10 seconds.
Easy query like "TRUNCATE TABLE #tt22" can take over 15 seconds.
It's an ...
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Does large tempdb file size have impact on sql server startup time?
Sql server tempdb data and log initial file size is configurable.
Assuming I set it to large values (say 10GB) then will sql server take more time to start compared to if the data/log initial file ...
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Is it ok to have 8 tempdb data files on 4 logical processor?
I aware of the general rule of thumb, which is the no. of tempdb data files = no. of cores.
But I'm running SQL server 2016 with 4 logical processors and 8 tempdb data files.
Just wondering if this ...
Alexandre Alvaro
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Query stuck on 0% ROLLBACK for 2 days
kill with statusonly returns:
transaction rollback in progress. Estimated rollback completion: 0%.
The query creates a temp table and runs on local server without using xp_cmdshell.
CPU & reads ...
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Does enabling readable secondary in the availability group put any load on the primary server's tempdb?
Enabling readable secondary will result in addition of 14byte extra information to each row in the primary as well as secondary.
This will also automatically enable the snapshot isolation level on the ...
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Does tempdb recommended count depend on the total processors on the computer or on the processors in a single NUMA node?
The number of secondary data files depends on the number of (logical)
processors on the machine. As a general rule, if the number of logical
processors is less than or equal to eight, use the same ...
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temp DB file does not exist after moving
I am using SQL server 2019 AG.
I am facing an issue after moving temp DB files from one drive to another after locating the file paths by this script:
Use master
GO
SELECT
name ...
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Any benefit creating temp tables with random prefixes in SQL Server to control latch waits on tempdb database
Recently I came across reading in one of the blogs that if a temp table name is prefixed with different/random names (in different procedures) that could benefit in reducing the concurrency issues / ...
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2
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Change location of innodb_temporary
I want to change the path where the ibtmp1 is stored in mysql 8.0.25 on debian 11. How to do this? I see:
mysql> SELECT * FROM INFORMATION_SCHEMA.FILES WHERE TABLESPACE_NAME='innodb_temporary'\G
***...
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Alter the collation of a column in temp-file
I have a routine in a DB that uses a temp-file. But the collation of the DB doesn't match the collation of the temp-DB. I can't change the collation of the DB, it's a client DB.
I tried this:
BEGIN
...
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Monitor tempdb iops on Azure VM
I've inherited SQL on Azure VMs where not all the tempdb files are on the ephemeral D: drive. I'd like to move them back there as that is the MS recommended location for latency reasons. However, ...
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How does blocking increase sos_scheduler_yield wait?
What is the correlation between blocking and CPU? Because I am reaching the conclusion that the blocking is causing my sos_scheduler_yield wait type to increase, but I would like to understand the ...
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configure size temdb [duplicate]
I have a disk space of 743 GB which contains the tempdb database
there was a request to set the max size tempdb to 669GB keeping 10% percent as free disk space
I have 8 tempb file + log file
how can I ...
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DBCC CHECKDB on a user database: Time-out occurred while waiting for buffer latch type 2 for page (X:XXX), database ID 2
Our Ola Hallengren IntegrityCheck job failed due to a buffer latch timeout while running DBCC CHECKDB on a user database.
However, the buffer latch timeout reported was in TempDB (database ID 2).
...
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Unable to connect to Database Engine after trying to move tempdb
I've just made a boo-boo in my personal SQL instance. I wanted to move tempdb files to C:\tempdb.mdf and C:\templog.ldf respectively. The alter database ...modify file... command ran successfully. ...
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SQL TempDB swells to unmanageable size [closed]
We're using SQL server 2014 SP4. Out of several stored procedures, there's a particular one that creates about 30 very large temp tables (wasn't created by myself). The process is run via daily SQL ...
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How to detect tempdb usage?
On-premise, we are using SQL Server 2019 Standard Edition under READ_COMMITTED isolation level and I want to test how one database with perform with READ_COMMITTED_SNAPSHOT (the Azure default).
The ...
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Excessive TempDB Usage When Using Pivot + Temp Tables
I have a stored procedure that is acting quite strangely, it basically works in this way:
--Populate #tmpActualsVertical with data(in this example 84,652,788 rows)
SELECT ...
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Can an odd number of stripes in RAID can affect tempdb performance if I have an even number of data files in tempdb?
This is out of curiosity: since it is recommended to configure tempdb data files in an even number of sets so that it can get aligned with NUMA nodes evenly, I just wanted to know if it is the case ...
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SQL Server 2017: sort_warning event fires when running a simple execution plan with no sorts and hash joins
sql gurus,
here is a script (fragment, object creation & data population postponed):
update #chart_estimate_
set [His seas data] = 1
from #chart_estimate_ ce
where exists (select top 1 r.[...
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SQL Server 2014 - Disk Space Issue
Currently we have a drive on your server that stores all user DB's data files along with one tempdb data file. (D: drive) It has 1.4 TB total space with only 98Gigs free space.
The biggest DB size is ...
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How does proportional fill algorithm help with tempdb performance once the files are full?
Having about 8 tempdb data files is a good practice because of large number of object creation and deletions that happen in the tempdb. So sql server can use the data files in parallel.
Given this ...
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Stored Procedure fails on tempdb-diskspace when executed by SQL Agent
I developed a bunch of ETL procedures which are executed by an overlaying SQL Script and write Data to separate DB. The Script uses a single Transaction, ensuring we only get complete data.
This ...
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Need best practices to maintain TempDB which is growing to 100GB now, is moving Tempdb to 35GB drive have any limitations? [closed]
Can moving TempDB to smaller drive cause failures?
How can TempDB be configure to use 35GB drive without any issues?
Please suggest if something needs to be taken care for this smooth transition of ...
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How can we restrict tempdb usage for specific users or queries on SQL Server?
In our SQL Server production environment some users run ad hoc queries that run huge data extracts into tempdb and fills it up, causing issues on a production server. And as these reports/queries run ...
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Could LCK_M_SCH_S cause a spike in read/write latency for tempdb files?
I noticed a big uptick in tempdb read/write. This was during the same period of time that someone ran Alter Index and I noticed that the biggest wait at that time was LCK_M_SCH_S.
I'm trying to track ...
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SQL Server in-memory optmized tempdb metadata memory usage continually growing
Problem
We have enabled sp_configure 'tempdb metadata memory-optimized' = 1, and now the tempdb meta data is taking over 400 GB on one of our servers and continues to grow. There are some drops in ...
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When tempdb allocations are released?
In a Service Broker queue, when one message is proceed over time, we are executing a stored procedure which is performing some heavy operations using temporary tables.
I guess that the sp_WhoIsActive ...
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Urgent help with TempDB log file growth mystery
I need some urgent guidance for a tempdb issue for past last week:
The tempDB log file is growing starting a specific time, lets say 2 PM. And almost continue to grow upto 150 GB and then comes down ...
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does SELECT with implicit transaction prevent VersionStore cleanup?
The JDBC driver usually sets the implicit transaction on in every query executed by the client.
I found many SELECT statements in suspended state with implicit transaction set to ON using Version ...
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Avg write latency spikes for disk more than usual. Need help finding the culprit
We recently had increased in disk write latency reported. Though from our monitoring team it was not confirmed from which drive but doing some dmv query I see tempdb around avg 32 ms wait on write. ...
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Error [36, 17, 145] occurred while attempting to drop allocation unit ID ##### belonging to worktable with partition ID #####
We regularly get this error on a SQL Server 2016 SP2 instance.
(Microsoft SQL Server 2016 (SP2) (KB4052908) - 13.0.5026.0 (X64)
Mar 18 2018 09:11:49 Copyright (c) Microsoft Corporation Enterprise
...
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sys.dm_tran_version_store_space_usage reports always zero space used
I was learning about RCSI when I discovered something strange on Azure SQL Database.
The DMV sys.dm_tran_version_store_space_usage always reports 0 as the space used by the version store, even if I ...
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System SPID running for hours filling up the TempDB Log
I've been trying to track down the source of my tempdb log filling up every few weeks where the tempdb log space used will continue to grow until it reaches 99% and stays there for hours while the log ...
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