can snapshot cause temdb issue

Yes, Snapshot Isolation can cause significant TempDB issues because it relies on row versioning. Every update or delete operation generates old row versions that are stored in TempDB's Version Store. Snapshot transactions read these versions to maintain a consistent transaction-level view of the database. The major risk occurs when snapshot transactions remain open for a long time. SQL Server cannot remove row versions that may still be required by an active transaction, causing the Version Store to grow continuously. In high-volume OLTP environments with heavy update activity, this can lead to excessive TempDB growth, increased I/O, storage pressure, and even TempDB exhaustion. Monitoring Version Store usage, identifying long-running snapshot transactions, sizing TempDB appropriately, and keeping transactions short are essential best practices when using Snapshot Isolation in production systems.

RCSI vs Snapshot from TempDB Perspective

Feature	RCSI	Snapshot
Uses TempDB Version Store	Yes	Yes
Generates Row Versions	Yes	Yes
Long Version Retention Risk	Medium	High
TempDB Growth Risk	Medium	High
Common Cause of TempDB Explosion	Less Often	More Often
Long Running Transaction Impact	Lower	Higher