sybase asa - Adding index to the column already having an index -

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there indexes available each columns. ex: indx1 on col1 , indx2 on col2. possible create again composite index indx3 combining col1 , col2? col1 , col2 used in condition. indx3 in effect?

yes, query optimizer best matching index. if include col1 , col2 in composite index , query (where) 2 fields use index.

you should consider throwing away index on col1 because composite index can used queries on col1 too. depends on sequence of columns in composite index: first column can queried without second one.


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