What the heck is the SQL Server Version Store?
https://am2.co/2019/10/what-the-heck-is-the-sql-server-version-store/
Oct 15, 2019 · What it is. When using an optimistic locking isolation level, SQL Server introduces row versions, kept in the version store which allow read queries to not block or be blocked. When a row is updated or deleted, the “stale” version gets stored in the version store. The version store isn’t part of a database itself, but rather is in tempdb.
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