Re: [ EXTERNAL ] Do any of you have a policy on rebuilding indexes? -- MIDRANGE-L

Subject: Re: [ EXTERNAL ] Do any of you have a policy on rebuilding indexes?
From: Patrik Schindler <poc@xxxxxxxxxx>
Date: Thu, 30 Mar 2023 16:44:39 +0200
List-archive: <https://archive.midrange.com/midrange-l/>
List-post: <mailto:midrange-l@lists.midrange.com>
List-subscribe: <https://lists.midrange.com/mailman/listinfo/midrange-l>, <mailto:midrange-l-request@lists.midrange.com?subject=subscribe>
List-unsubscribe: <https://lists.midrange.com/mailman/options/midrange-l>, <mailto:midrange-l-request@lists.midrange.com?subject=unsubscribe>

Hello Ken,

Am 30.03.2023 um 16:32 schrieb Ken Meade <kmeade@xxxxxxxxxxxxxxxxx>:

This raised a question for me. How could you investigation your indices to determine last use, number of records affected, etc across all your files.
Perhaps indices are no longer required and could be deleted and would that improve performance?

Not sure if "last use" is recorded. Problem is: The more statistics you gather, the more that gathering will affect system performance negatively.

Regarding your question, it boils down on "know your system", aka the software which is using those tables, and how. At least WHERE and JOIN clauses benefit heavily from indexes. If a field value is not used for that, I'd say the index can be deleted. This is not IBM i specific.

:wq! PoC

As an Amazon Associate we earn from qualifying purchases.

This mailing list archive is Copyright 1997-2025 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.