SQL Server 2014 的问题 - SQL Server 数据库上的锁

Question

We upgraded from SQL Server 2008 to SQL Server 2014. The upgrade was successful.

However, there were problems with optimization. Some queries have started to create locks based on. Often the blockade disappears or whip it but the base does not want to move.

The solution to this problem with us is the MAXDOP change. After the change I do not know what is freeing but everything starts to go like before the jam in the database. I have no idea what to do about it anymore.

Our SQL Server configuration

We have already changed the cost and MAXDOP parameters. Doesn't help much. I've optimized queries that cause blockades.

The problem persists all the time. Oddly enough, the MAXDOP change helps with this blockage. The system then completely forgives. SQL queries go down and execute.

Answer 1

The performance issue can raise due to a lot of reasons. improper Maxdop settings is just one of them.

Run a health check with Sp_Blitz

• Run sp_blitz [sp] ( https://github.com/BrentOzarULTD/SQL-Server-First-Responder-Kit#sp_blitz-overall-health-check ) to see what is actually causing your performance bottleneck .
• check for priorities from 1to 50, those are most crucial.
• start fixing them one by one