sqlserver @managesqlserver
In ♥ with SQL Server and obsessed about performance Joined September 2016-
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#sqlserver Selectivity for #sqlquery = (rows returned by a predicate / total rows input to the predicate) @SQLServer
#sqltidbit Predicate in a #sqlserver #query is that which is in a WHERE or JOIN clause, & evaluates to TRUE or FALSE @SQLServer
If all rows need be fetched from table, but ORDER BY has an indexed col,#sqlserver will do index scan, not table scan #sqltidbit @SQLServer
Very interesting ... if a table is small, indexes don't make sense #SQLserver #SQL @SQLServer #SQLtidbit
Why is a specific query plan chosen by @SQLServer when it executes a query?Here's a post on that: goo.gl/msuQId #SQLserver #SQL
Super useful list of #SQLserver system catalog queries goo.gl/V9BjKs worth creating a bookmark #SQL #SQLserverdba
A common mistake : Not okay to just copy/paste #SQL scripts for #SQLServer. Each script is to be tuned to the specific database. @SQLServer
Interesting to note : QUERY RESPONSE TIME = the time to get the 1st record TOTAL TIME = time to fetch all records #SQLServer #sqltoday
#SQLServer will have two copies of any Query Plan in memory ; one for serial executions and one for parallel ones! Interesting! #sqltoday
TDS (Tabular Data Stream) is the native protocol i.e. the way in which all SQL Server communication happens! #sqltoday #SQLServer
Ever thought what goes inside SQL Server? Here's something to see! youtu.be/9N6tTdlkE68 #SQLServer #sqlperformance #sqltoday
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