Why is transaction log filling up in simple recovery model?

Why is transaction log filling up in simple recovery model?

Still the the transaction log goes through the roof evertime I do a Where eventually it fails becouse transaction log is full…. (Msg 9002) sql claims that I cannot perform a transaction log backup (Msg 4208). So I ‘m stuck with a large log file in the “simple” recovery model that can not be shrunk…

What does it mean to take a log backup?

So LOG_BACKUP really means “either you need to take a log backup, or the log records that were backed up were all in the current VLF and so it could not be cleared.” Hope this helps!

When to use log reuse wait DESC in sys.database?

Firstly, what is log_reuse_wait_desc? It’s a field in sys.databases that you can use to determine why the transaction log isn’t clearing (a.k.a truncating) correctly. Usually you query it when a log file is growing and you want to know why, using code like: ?

How big is MY SQL Server transaction log?

I have a fairly large SQL Server database that is using SIMPLE recovery mode. We don’t really have a need for up to the second recovery so i’d prefer we stay with this mode. For some reason the transaction log for this database is massive (410 GB) with 99% of the space unallocated.

When to use simple recovery model in SQL Server?

SQL Server Simple Recovery Model When the simple recovery model is in place, transaction log file entries will be available only while the transaction is active. Once the transaction is committed, log entries can be overwritten by other transactions, so the transaction log space is reclaimed for new transactions.

When does the simple recovery model take place?

When the simple recovery model is in place, transaction log file entries will be available only while the transaction is active. Once the transaction is committed, log entries can be overwritten by other transactions, so the transaction log space is reclaimed for new transactions.

What happens to the transaction log in SQL Server?

If the database is configured with Full recovery model, the SQL Server Engine keeps the transaction logs in the SQL transaction log file as inactive, after committing the transaction and performing a checkpoint operation, and will not be truncated until a SQL transaction log backup is performed.

How to get transaction log to stay manageable?

I still think that the only way you can get the log to stay at a manageable size is to split the DELETE down into smaller transactions. The deletion of four million rows is an awful lot of work to perform in a single transaction. Issue a CHECKPOINT in between DELETEs, to force a truncate, and you should be fine.

Why is there no log reuse in simple recovery?

There are a handful of things that could cause this behavior, even in the simple recovery model. Your best bet would be to setup a data collection job to routinely pull the log_reuse_wait_desc for your database, and routinely log this somewhere. Then you should be able to reverse-engineer what is causing the lack of log reuse.

When to reuse a SQL server log file?

Look up ACID properties and that should make sense quickly), but once you no longer need it for that crash/restart recovery purpose, go ahead and reuse the log file. SQL Server listens to this request in Simple Recovery and it only keeps the information it needs to do crash/restart recovery.