Updating statistics sql 2016 r2

16-Jun-2017 01:30 by 9 Comments

Updating statistics sql 2016 r2

Exploring all these alternatives can be time consuming and this is why once a query plan is created is also cached for future reuse.

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For instance a query plan will describe an access path like .this allows it to start executing and then start consuming the stream of data to insert..The above mentioned task created to handle the request will represent the request from beginning till completion.For a SQL batch request the worker that picks up that task will execute the entire SQL batch (every statement).This should settle the often asked question whether statements in a SQL batch (= 1) and create sub-tasks, each sub-task goes through exactly the same cycle: it is created as PENDING and a worker must pick it up and execute it (a different worker from the SQL batch worker, that is by definition occupied! The lists and state of workers inside SQL Server can be seen by querying .The application can use one of the several client-side implementations of the protocol: the CLR managed Sql Client, Ole DB, ODBC, JDBC, PHP Driver for SQL Server or the open source Free TDS implementation.

The gist of it is that when your application whats the database to do anything it will send a request over the TDS protocol.If you are a developer writing applications that use SQL Server and you are wondering what exactly happens when you ‘run’ a query from your application, I hope this article will help you write better database code and will help you get started when you have to investigate performance problems. The only way to interact with the back-end database is by sending requests that contain commands for the database.The protocol used to communicate between your application and the database is called TDS (Tabular Data Sream) and is described on MSDN in the Technical Document [MS-TDS]: Tabular Data Stream Protocol.This is the type of request Sql Client sends if you invoke any of the managed class.Bulk Load is different from the other requests because is the only request that starts execution before the request is complete on the TDS protocol.For example if the request is a SQL Batch type request the task will represent the entire batch, not individual statements.