It is not common to have SQL log files larger than data files.
If it is, this may indicate a potential problem:
- A possible bad maintenance plan (backups are not being performed correctly).
- There is a process that has a massive size transaction. Or transaction is never commited.
- SQL replication may be broken.
By the way, this check is a part of our SQL Server Health Check service.
How to find databases with Log files larger than database files?
You can use the script below. It will return all databases with logs files (over 1GB) larger than data file.
SELECT DB_NAME(a.database_id) AS DatabaseName, CAST((CAST(a.size AS BIGINT) * 8 / 1000000) AS NVARCHAR(20)) AS 'LogFileSize_GB' FROM sys.master_files a WHERE a.type = 1 AND DB_NAME(a.database_id) >4 AND a.size > 125000 /* Size is measured in pages here, so this gets us log files over 1GB. */ AND a.size > ( SELECT SUM(CAST(b.size AS BIGINT)) FROM sys.master_files b WHERE a.database_id = b.database_id AND b.type = 0) AND a.database_id IN ( SELECT database_id FROM sys.databases WHERE source_database_id IS NULL)
How can I fix the issue?
Read the details below for information on how to:
- Check if you are using the correct recovery model.
- Verify the maintenance plans.
- Shrink the transaction log file.
Let our expert SQL Server Consulting team handle the technical complexities, so you can focus on driving your business forward with confidence.