Transaction Isolation Levels and sp_executesql

SQL Server has several transaction isolation levels; probably the one most people are familiar with is the default of “read committed”. However, you may not realize it, but running dynamic code via sys.sp_executesql doesn’t necessarily…

Archive Data by Date

Tables with a large amount of data can become unwieldy. As a result, it’s not uncommon to archive data by date into an archive table that contains older rows we care about, but don’t need…

Memory Consumption by Object

SQL Server caches object data in memory in the buffer pool. Understanding memory consumption by object can be crucial for performance. For instance, you may have a large logging table consuming 90% of the buffer…

dm_db_database_page_allocations

sys.dm_db_database_page_allocations is an undocumented SQL Server T-SQL Dynamic Management Function. This DMF provides details about allocated pages, allocation units, and allocation extents. The function definition in SQL Server 2016 is:

The function definition tells…

Using Dynamic SQL inside a Stored Procedure

Preventing direct access to database tables for users is a widely considered “best practice” for many DBAs. The pattern typically looks like User -> Stored Procedure -> Tables. Since the stored procedure owner has access…