Questions tagged [tempdb-version-store]
SQL Server object stored in tempdb used to support various data-versioning operations.
22 questions
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If Read Committed Snapshot Isolation is already enabled, what is the cost of enabling Snapshot Isolation?
Suppose that I have a database with Read Committed Snapshot Isolation already enabled. Is there any reason at all to not also enable Snapshot Isolation?
Intuitively, you would think that the row ...
- 1,362
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What could be causing tempdb version store growth on primary node in the absence of open/active transactions on readable secondary db?
This is a SQL server 2022 CU10 enterprise edition server, 2 node AG with readable secondary.
30 user dbs are in the AG.
Via an inhouse SQL monitoring tool I observed tempdb version store growth on ...
- 3,610
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Tracking down reason for growing version store
Hello all and thank you for reading!
Im trying to find the issue for a growing and growing version store in an app database.
With the help here:
Find transactions that are filling up the version store
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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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Understanding of SQL Server version store
I'm trying to understand SQL Server version store and related isolation levels. As I understand it, when a database enabled read committed snapshot option, this could happen:
An item (id = 1) has ...
- 1,239
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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 ...
- 107
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Bypassing version store for changing column datatype
Database is Always On High Availability synchronised database on SQL Server 2019 with READ_COMMITTED_SNAPSHOT on and we are updating datatype from varchar to nvarchar (with "alter table" ...
- 256
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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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TempDB Version Store used by DB STARTUP background process
I have two availability group on the same SQL Server 2012 Instance (synchronous commit).
Trace flags 1118 and 1117 are both enabled.
TempDB has been growing for about two weeks: it starts from 36GB ...
- 107
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Version Store usage and entries in dm_tran_active_snapshot_database_transactions
So I'm trying to understand why are having occasional problems with tempdb filling up with version store entries.
I'm closing in on the problem, and am now seeing entries in ...
- 256
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60GB in version store in short amount of time, allow snapshot isolation is disabled
We had a situation where the version store went from zero to 60 GB in just a few minutes. It stayed high for hours and due to the performance impact of this on tempdb (disk queue was 1000), almost ...
- 8,092
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Does STATISTICS IO output include Version Store reads?
SQL Server has an option SET STATISTICS IO ON that shows the number of logical and physical page reads for a query. Do these stats include reads of the version store for SNAPSHOT and RCSI queries?
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SELECT blocks UPDATE in Snapshot Isolation
We have a database running on SQL Server 2016 SP1 Enterprise and on which Allow Snapshot Isolation is enabled. In this scenario readers do not block writers and writers do not block readers.
Today we ...
- 2,122
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Questions about tempdb version store
We ran across an error today:
Error: 3967, Severity: 17
and from what I can tell it's basically 'full version store'. This has raised some questions that I've had trouble answering, as at my shop we'...
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When are the unnecessary row versions being removed from the version store
Sorry for my bad English :)
I need a help with understanding version store`s cleaning. I have the following situation.
12:00 Start a select statement under the snapshot isolation level and not commit....
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