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Questions tagged [tempdb-version-store]

SQL Server object stored in tempdb used to support various data-versioning operations.

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1answer
36 views

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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2answers
33 views

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" ...
4
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1answer
101 views

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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1answer
116 views

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 ...
2
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1answer
99 views

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 ...
2
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1answer
141 views

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 ...
9
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1answer
225 views

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?
1
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1answer
463 views

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 ...
9
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1answer
2k views

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 ...
2
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0answers
249 views

Phantom Transactions using Version Store in tempDB

We are seeing version store space increasing on one of our servers, and there are ~20 sessions that are showing as actively accessing version store rows for over 24 hours. The problem is, when I try ...
12
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1answer
4k views

In case of multiple updates of the same record in a single transaction, how many versions are being stored?

According to MSDN article by Kimberly L. Tripp, Neal Graves's "SQL Server 2005 Row Versioning-Based Transaction Isolation "... All the earlier versions of a particular record are chained in a linked ...
4
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1answer
286 views

Why do row-versioning isolations use a linked list of versions of record? [closed]

Trying to better understand row-versioning based transaction isolations in SQL Server... According to Kimberly L. Tripp, Neal Graves's "SQL Server 2005 Row Versioning-Based Transaction Isolation": ...
7
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1answer
285 views

Does RCSI use less or same space than SNAPSHOT? Why?

Trying to better understand row-versioning based transaction isolations - RCSI (Read Committed Snapshot Isolation and SNAPSHOT) - in SQL Server... MSDN online article "Choosing Row Versioning-based ...
2
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1answer
91 views

Why - read but not update ops fail in case of lacking space in tempdb database?

MSDN online article "Choosing Row Versioning-based Isolation Levels" states: "tempdb must have enough disk space for the version store. If there are very long-running transactions, all the versions ...
8
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2answers
11k views

TempDB Version Store cleanup

From what I can find the version store will only clean up versions that are older than the oldest active transaction. Question: Is the oldest transaction database specific or will SQL Server keep all ...
6
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1answer
11k views

Find transactions that are filling up the version store

we have enabled the "READ_COMMITTED_SNAPSHOT" for some of our SQL Server 2005 databases. Now from time to time we see that our TempDB is filling up the harddisk and we suspect the version store to be ...