Index Fragmentation in SQL Server: Stairway to SQL Server Indexes Level 11
Internal and external fragmentation – Causes, cures, and when not to care
Internal and external fragmentation – Causes, cures, and when not to care
Included columns enable nonclustered indexes to become covering indexes for a variety of queries, improving the performance of those queries and with the only overhead being an increase the size of an index.
We've now seen how indexed and non-indexed tables perform in queries, and established "logical reads" as the metric for query performance. Now it is time to explain why logical reads are an excellent metric and also explain what is actually being read.
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Trunk based development is what many of us do with shared database servers.
When you index a nullable field, are the rows with nulls stored in the index? It’s easy enough to find out by creating a table with a nullable field, and then creating an index on it.
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Even when creating games, your code has access to environment variables and document files. In this article, Lance Talbert shows how to access files to convince the player that maybe the game knows more than it should.
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I want to create a JSON document that contains data from this table:
TeamID TeamName City YearEstablished 1 Cowboys Dallas 1960 2 Eagles Philadelphia 1933If I run this code, what is returned?
SELECT json_objectagg('Team' : TeamName)
FROM dbo.NFLTeams;
See possible answers