![]() ![]() When all statements in the request have executed, the thread is free to pick up another request and execute it.įor a much more detailed explanation read Understanding how SQL Server executes a query.Ī request is either executing or is waiting.Data locking ensures correctness under concurrency.All updates are written into the database log and into the in-memory cache (into the buffer pool), according to the Write-Ahead Logging protocol. ![]() ![]() If data is not in this cache, it must be read from disk into the cache. All data is read from in-memory cache of the database (the buffer pool). Stored procedures executes the same way, statement by statement. A statement in a request must finish before the next starts, always. The request is executed statement by statement, sequentially.A free thread from SQL Server’s own thread pool picks up the request, compiles it and executes it.The request is placed in a queue inside SQL Server memory.The application sends a request to the server, containing a stored procedure name or some T-SQL statements.The grossly simplified explanation is that SQL Server executes your queries as follows: To be able to troubleshoot performance problems you need to have an understanding of how SQL Server works. SQL Server blocking related performance counters. ![]()
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