indexing in sql server

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Example: SELECT * FROM TABLE , If I use indexing to fetch data,, since there is no where clause here, indexing has no signification, because there is no where cluase, table scan will occur inspite of indexing right?

Posted 20-Aug-15 3:36am

Sagar Byali

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Mehdi Gholam · Answer 1 · 2015-08-20T03:56:00

Solution 1

"table scan" applies to index usage, when your selecting all rows from a table the query processor will just read and output from the pages until the end of pages or a row limit (if you have defined one) is reached.

Posted 20-Aug-15 3:56am

Mehdi Gholam

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Maciej Los 20-Aug-15 17:32pm

Short and to the point! +5!

Mehdi Gholam 21-Aug-15 1:36am

Thanks Maciej!

Maciej Los · Answer 2 · 2015-08-20T11:31:00

Solution 2

In short: here is very interesting article: Index Scans and Table Scans[^] which explains when table scan and index scan is occurring.

Posted 20-Aug-15 11:31am

Maciej Los

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Mehdi Gholam 21-Aug-15 1:36am

5'ed

Maciej Los 23-Aug-15 15:35pm

Thank you, Mehdi.