DB_NAME(@dbID) returns Null

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
sql
Domain
databases

Research direction

Start by locating the script that applies the sys.Databases database_id to DB_NAME, then compare its behavior with DB_ID() and the database name. Verify the change against the reported case where the database_id values differ and DB_NAME(@dbID) returns NULL.

Written by the indexing model from the issue text.

Description

In my example sys.Databases lists my database_id as 6 but if I query DB_ID() it returns 5. The script uses database_id applied to DB_NAME and it returns null in my case. Googling is suggesting that this ID can't be relied upon and that the db name should be used instead.

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