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Secondary indexes in SQL Server.
Secondary indexes in SQL Server.
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Shadab Shah
Shadab Shah
Posted Thursday, January 17, 2013 2:21 AM
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Hi all,
What are secondary indexes in SQL Server and why are they needed.
Post #1408236
GilaMonster
GilaMonster
Posted Thursday, January 17, 2013 2:40 AM
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No such thing as a secondary index. Do you mean a secondary XML index?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
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Post #1408245
OTF
OTF
Posted Monday, January 21, 2013 4:23 AM
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I can only imagine a writer using the term "secondary indexes" to refer to any indexes other than one on a Primary Key? In that case, such indexes are used to aid or make more efficient the retrieval of data.
Post #1409471
GilaMonster
GilaMonster
Posted Monday, January 21, 2013 5:10 AM
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OTF (1/21/2013)
I can only imagine a writer using the term "secondary indexes" to refer to any indexes other than one on a Primary Key?
That would be an incorrect term for them. The only 'secondary' indexes in SQL are secondary XML indexes. Indexes other than the primary key are just clustered/nonclustered indexes.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #1409496
OTF
OTF
Posted Monday, January 21, 2013 5:42 AM
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That would be an incorrect term for them.
Nevertheless, it's a term I've seen used by some authors to explain the concepts of Indexes.
I guess only the OP knows whether the term was used as it relates to XML Indexes or Indexes in general.
Post #1409513
opc.three
opc.three
Posted Monday, January 21, 2013 7:14 AM
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OTF (1/21/2013)
That would be an incorrect term for them.
Nevertheless, it's a term I've seen used by some authors to explain the concepts of Indexes.
I guess only the OP knows whether the term was used as it relates to XML Indexes or Indexes in general.
It's common and correct for Oracle users to speak that way about indexes, maybe other DBMS' too, but not for SQL Server users. I would hope that an author writing about SQL Server whose work passed through a technical editor did not publish anything discussing "secondary indexes."
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Post #1409541
Andrew Pruski
Andrew Pruski
Posted Tuesday, January 29, 2013 6:37 AM
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Hello,
There's good information on indexes on the MSDN website. Should give you the required background information:-
http://msdn.microsoft.com/en-us/library/ms189271(v=sql.105).aspx
Regards,
Andrew
Post #1413004
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