What happens when SQL log file reaches max size?

Question

If your log file reaches its limit in size during a transaction and cannot autogrow then the transaction won't be able to commit and you will see errors in SQL. The log file needs to be sufficiently sized to handle the transactions in between CHECKPOINT operations. 19 окт. 2014 г.

What happens when SQL log file is full?

When the transaction log becomes full, SQL Server Database Engine issues a 9002 error. The log can fill when the database is online, or in recovery. If the log fills while the database is online, the database remains online but can only be read, not updated.

How big should a SQL log file be?

Although there is no one optimal value for Transaction Log File initial size and auto-growth that fits all situations, but setting the initial size of the SQL Server Transaction Log file to 20-30% of the database data file size and the auto-growth to a large amount, above 1024MB, based on your database growth plan can ...

How big can a log file get?

No more than 2 or 3 entries per user action though, unless you are doing batch operations. Don't put more than 2MB in a file, so the user can email it you. Don't keep more than 50MB of logs, because it's probably not your space you are wasting here.

Is it safe to shrink SQL log file?

It's safe, but do it at a quiet time when there's low transactional activity. It's recommended to shrink the log to its minimal size and then grow it to its normal size (this will ensure the correct number of VLFs (internal virtual log files) are created, which improves performance for logged commands).

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