This happens just in some specific situations – when there is a long running transaction or transaction that creates many changes.
In the Simple recovery model, the online transaction log is cleared automatically. SQL Server automatically reclaims log space to keep space requirements small – but that doesn’t mean it won’t grow. The online transaction log must provide enough information for a database rollback, therefore it must provide enough space for all necessary information. As all transactions must be written into the online transaction log, in case of a large number of changes in a transaction, there might not be enough space in the log, so it must be expanded.Find more information on the SQL Server transaction log topic in the 10 most important SQL Server transaction log myths article.
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