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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How to exclude tempdb from sp_MSforeachdb?

Below I have a code to get info about t-log backups for each database in the server. I want to exclude tempdb from this list. exec sp_MSforeachdb 'SELECT server_name, sysdb.name AS DatabaseName, bkup....
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Enabling write caching for TempDb data drives

Recently, we had issues with slowness for some queries where TempDb latencies on their respective drives had spikes. We already have 8 tempdb files and trace flags 1117 and 1118 are not enabled. We ...
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What is hot spotting in the context of adding files to tempdb?

I'm trying to find out whether it is possible to add tempdb files to a SQL Server without having to restart the SQL Server service. I saw this answer here on Database Administrators: Tempdb Add files ...
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What happens when there is no available physical memory left for SQL Server?

While googling I found some conflicting information. Some sites state that when there is no physical memory left for data, then SQL Server moves the already existing data into TEMPDB (see: SQL Server:...
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tempdb move issue

In preparation for moving many of my databases in a data warehouse to READ COMMITTED SNAPSHOT isolation level (CDC and Reads contend for locks) I added a drive and moved my tempdb there (mdf and ldf) ...
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Need to move TempDB to another drive. But its files cannot be dropped or shrunk

Today I had a task to move all TempDB files to a new, smaller drive (RAMdisk). I analysed TempDB files space usage - not all the space inside of its files was used so I decided that new drive is ok. ...
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TempDB Transaction log not releasing space

Every time I complete a transaction in tempdb, the temp log grows, however the log doesn't seem to release the space once the transaction has completed.The log usage percent is 43.4% but seems to ...
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TempDB file overflow

This is my experience with TempDB. The Algorithm works better when the TempDB File sizes are the same size. We were seeing heavy TempDB contention on a TempDB file that was larger than the others. ...
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Setting up TempDB for more than one instance of SQL Server

I've been given the task of transferring the contents of a SQL Server instance from one Windows server to another Windows Server. One of the many things I need to do on the new server is set up the ...
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SQL Server sys.dm_tran_active_transactions long running transaction worktable

today I used the system object sys.dm_tran_active_transactions (to be honest for the first time). I had an issue with distributed transactions (Microsoft DTC) and went digging there after I had no ...
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SQL Server tempDB data file is growing very fast. 120gb

My tempDB is now over 120GB. It has grown 65GB in a couple of hours. It is not the log but the actual DB that is growing. Reports show 99% is unused space. I tried restarting the server that SQL ...
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A very strange thing in the tempdb [closed]

In all the following scenarios on my laptop, all the tables in the SSMS Tables folder will be deleted from tempdb: Instance Restart; Stop & Start SQL Server Service; End Task SQL Server process ...
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SQL Server tempdb log file isn't autogrowing, instead getting error “The transaction log for database 'tempdb' is full due to 'ACTIVE_TRANSACTION'” [closed]

FYI: moved from Stack Overflow https://stackoverflow.com/questions/56350491/sql-server-tempdb-log-file-isnt-autogrowing-instead-getting-error-the-transac I'm using SQL Server 2016 and am encountering ...
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Troubleshooting TempDB for Performance Bottlenecks

While trying to investigate some performance issues with our SQL Server database, I've noticed our wait statistics seem high for ASYNC_IO_COMPLETION and PAGEIOLATCH_*. In Resource Monitor I noticed ...
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“tempdb metadata memory-optimized” configuration option

Checking SQL Server 2019 CTP 2.5 (15.0.1500.28) I found this new configuration option and was wandering what is behind it. Couldn't find any information so far and was wondering if you know where to ...
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Log for database tempdb is not available

I have been struggling with this issue from so many months now, I am saying its not a database issue and assigning this case to Storage and Operating system team and they are assigning it to me ...
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In memory table vs temporary table - benefits if temdb in already on ram disk

In the docs, we have example of how temporary tables can be replaced with in-memory tables and because a memory-optimized table: is stored only in memory, and has no component on disk involves no IO ...
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My Temp db is full [duplicate]

What to do when tempdb is full ? I would like to know if tempdb has become full and what to do if you can't truncate the log? I want to understand the process why you can't truncate it.
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When I connect to DB, always connects as tempdb

I am trying to run a sybase DB query from a jsp session. I can connect to the DB fine, but when I run my query, by default it always runs against tempdb. Is there a way I can make a connection to ...
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How we can clear tempdb without restart MSSQL service [duplicate]

While checking my tempdb details, its showing that almost 90 GB is consumed. So I tried clearing all caches and perform shrinking, but still it's consuming 90 GB of space. My drive became full where ...
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Aggressive Tempdb spill process

We are having an issue with aggressive tempdb spills that significantly effect overall server performance and, in rare cases, cause AlwaysOn failures. Tested on SQL2016 and SQL2017 Enterprise (recent ...
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Should TempDB SSD Drive be formatted with 64 Kb Allocation Unit Size?

We have installed dedicated SSD drives for TempDB First question - should these drives be formatted with 64 Kb allocation size ? Currently it shows 4 Kb (Bytes per Cluster = 4096) Does TempDB ...
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Understanding the TempDB growth

Need to understand below behavior of tempdb:- Due to some poor running queries which caused Tempdb bloating, we had shrink and tried to adjust the sizes of each tempdb file: Before issue: no of ...
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How to clear temp database content in SQL Server?

As the title implies, I am going to clear the content of my temp database in SQL Server. SolarWinds is generating a critical alert and I want to clear the tempdb workfiles and worktables. How can I ...
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SQL Server 2016 still uses mixed_extent_allocation in TempDB

Today I was troubleshooting a problem on TempDB on SQL Server 2016 SP2 using extended events and added the mixed_extent_allocation and transaction_log event to my trace. I expected ...
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How to inspect global temp table from outside the transaction it is created in

To help debugging a batch of SQL (that is run inside a transaction), inside the transaction I dump some data into a global temporary table. The global temporary table is created inside the transaction ...
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SQL Server 2016 with high tempdb usage and low RAM usage

I've got a small instance of SQL Server Standard that I'm running HammerDB TPC-H (1 GB) benchmarks on. It's got some configuration issue though where it's writing everything into tempdb on disk, and ...
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Tempdb ndf files on different drives

So I inherited a server that has serious write latency issues according to a script provided by glen berry, I also noticed that the tempdb files are spread across multiple drives. What could be the ...
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Sort spills to tempdb but estimated rows equals to actual rows

On a SQL Server 2016 SP2 with max memory set to 25GB we have a query that executes about 80 times in a minute. The query spills about 4000 pages to tempdb. This causes for a lot of IO on the disk of ...
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Sort spills to tempdb due to varchar(max)

On a server with 32GB we are running SQL Server 2014 SP2 with a max memory of 25GB we have two tables, here you find a simplified structure of both tables: CREATE TABLE [dbo].[Settings]( [id] [...
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659 views

Does LocalDB support temporary tables?

Are SQL Server temporary tables (prefixed with #) supported in LocalDB instances?
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566 views

Unexplainable write latency tempdb

I have a virtual SQL Server 2016 SP2 CU2 with SAN storage. TempDB has 8 files. I know it is recommended to put TempDB on SSD but TempDB is hardly used so spinning disks are cheaper. I've noticed that ...
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501 views

Memory issues: Tempdb using Almost all of the buffer cache

On one of the servers I am working on today, i see that almost all of the buffer cache is filled by tempdb. As a result memory is very low on the server. CPU Tempdb: Version: Microsoft SQL ...
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What happen when a transaction is committed and SNAPSHOT isolation is enabled?

I am actually considering using SNAPSHOT isolation for one WCF service. Before doing so, I would like to know how it works. AFAIK, when it's enabled, updated rows are maintained in tempDB (instead of ...
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“The transaction log for database 'tempdb' is full due to 'ACTIVE_TRANSACTION'.” after adding indexes to temp tables

Recently, I added some indexes on temp tables to procedures which prepare data for data warehouse. On a testing db, tests of these procedures worked fine but when running on client's server it failed ...
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Moving tempdb from shared to local drive in a failover cluster

We have an existing failover cluster that I would like to have the tempdb in local drive. I'm not sure how to proceed. My thought process is below: Create two drives on each node one for tempdb and ...
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132 views

SQL Server Version Store Performance differences between RCS and ASI

I understand that Read Committed Snapshot (RCS) operates at statement level, and Allow Snapshot Isolation (ASI) operates at transaction level, and both store row versions in tempdb. I also understand ...
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311 views

Why do LocalTemp table showing with lengthy underscore under Temporary Tables of tempdb in SSMS 2017 Express Edition? [duplicate]

In my Microsoft SQL Server 2017 Express Edition, I have created a local temp table using below create statement, create table #localtemptable (tempid int,tempname varchar(20) ) After creating #table,...
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Does splitting 1 tempdb file into 4 require a SQL Server restart? [duplicate]

please can anyone help? I have a SQL 2008R2 instance with 4 cores, configured with 1 tempdb data file and 1 logfile. I want to change this setup as per best practices by adding 3 additional euqally ...
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Restricting users to execute queries that bloat up tempdb

we have many a times faced a scenario where bad queries using tempdb just bloats up this system database filling 700 GB of tempdb in like couple of hours. I know there is a scope to tune them up. But ...
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Tempdb with Multiple mdf and Renaming

We just inherited a legacy Tempdb database with Multiple MDF files. Tempdb1 is the primary. Example: Tempdb1.MDF Tempdb2.MDF Tempdb3.MDF (1) Was tempdb2.mdf and tempdb3.MDF being ignored the whole ...
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193 views

Tempdb Configuration best practices

I've been asked to provide my input on best practices to improve tempdb performance. I realise that this is a case by case basis and tempdb in one estate may have different requirements to another due ...
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TempDB log file bloated suddenly [duplicate]

I am trying to understand what could be the possible reason which would have caused tempdb ldf file grow full and went out of space on the drive it resides. Compared the pattern for last month and ...
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1answer
2k views

Tempdb Add files require Restart

Does adding Tempdb files require a restart? We would like to Add files on the same drive, Not Delete and Not modify. We tested in Dev and QA environment, restart was not required. However for ...
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Tempdb files Solid state on Same drive?

We currently have tempdb (8 files) on solid state drive. We know that primary mdf and transaction log ndf are recommended to be on different drives, to reduce contention. Should tempdb files be on ...
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1answer
925 views

How can I track down what's filling my 'tempdb' transaction log?

We have a large and fairly well tuned SQL Server 2016 Enterprise Edition. Given the number of cores we have, our tempdb is currently comprised of 16 2,950 MB files running on a ram disk with a 16 GB ...
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CONVERT_IMPLICIT when inserting a Geography datatype into a Geography datatype column on Temp Table

@@Version Microsoft SQL Server 2008 R2 (SP3) - 10.50.6220.0 (X64) If I try to insert data into a geography datatype in a temp table I get a CONVERT_IMPLICIT, converting a Geography datatype to a ...
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Contention on tempdb due to high concurrency temp table creation from multiple databases?

I have an environment with ~100 databases, all with the same schema. There is a stored procedure on each database that creates a #temp table and drops it, and is running very often (every 30 seconds ...
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1answer
326 views

Disk sizing considerations for 'tempdb' - Growing substantially two times a year

I have an HR software on which an employee of the HR department runs long and complex analyses and calculations about two times in a year. Because of this the tempdb is growing to 500GB and even more. ...
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Temp DB is growing continuously in SQL server

I have used temp tables and drop the same in the every stored procedure in my database. When I try to check my tempdb data using Select * from tempdb.sys.tables, I am getting many tables with names ...