Subject Re: [IBO] Understanding the IB_MonitorDialog Output
Author Helen Borrie (TeamIBO)
At 03:25 AM 18-01-02 +0000, you wrote:

>I have the following index defined on the table
>Create INDEX transtable1 ON transtable ( CUSTOMER, TRANS_ID,
>And it is still slow does it need to be specified as descending?
>(I am currently under the impression that descending is the default)

No, ascending is the default. If your want to offer a descending search order as an option, you need to support it by adding the same index in descending order.

Also, in IB, it is worthwhile experimenting with indexing individual columns, rather than creating a number of composite indexes. The IB can use multiple indexes on *different* columns intelligently, whereas it can sometimes ignore indexes where the same column is involved in a variety of indexes of the same ordinality...if Trans_ID is your primary key here, then an ascending index is already available. You might find you get similar or better performance without the composite indexes.

Helen Borrie (TeamIBO Support)

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