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What happens when you restart SQL Server?
When we restart SQL server, we get all the memory back to the server OS, completely clean plan cache and wipe out all tempdb. During that period, SQL server will read a lot of data from the disc and upload data back into the memory.
Should I restart SQL Server?
In general, SQL Server never requires a reboot, and derives no benefit from doing so. In theory, if Microsoft’s security and reliability was perfect and no hotfixes or patches were required, SQL Server could happily stay online forever. Unless it is really required you don’t need to do it regularly.
How can I tell if SQL Server is restarting?
We can view the SQL Server instance uptime from the windows event viewer. Open Control Panel Open Administrative tools Click on Event viewer. In the event viewer MMC (Microsoft Management console), expand Windows Logs Click on Application. You can see the numerous events that occurred on the workstation.
What happens when you restart a SQL Server?
Another very important side-effect of a SQL Server restart is that you lose all the compiled execution plans from the Plan Cache. For every query submitted to the database, SQL Server now has to compile a physical Execution Plan again – and this takes time.
Why do we need a plan cache in SQL Server?
A Plan Cache of SQL Server stores the precompiled execution plan for frequently executed of queries. It improves the query performance by reducing a cost of creating and compiling execution plan again and again. Apparently, most of our queries are frequently executing.
Why does SQL Server have to compile a physical execution plan?
For every query submitted to the database, SQL Server now has to compile a physical Execution Plan again – and this takes time. It can get even worse when you have some Plan Instability and SQL Server generates a different Execution Plan than you had previously.
Why does SQL Server use a buffer pool?
A Buffer Pool of SQL Server, very capable of storing the result of your frequently executed queries. It reduces the disk/io and improves the query performance by sending a result directly from the memory area. If a result is not available in the buffer pool, it fetches from the disk.