Re: Index

What does "if index is not managed" mean?

On Sun, Mar 10, 2024 at 9:11 AM Rajesh Kumar <rajeshkumar(dot)dba09(at)gmail(dot)com>
wrote:

> What will happen if index is not managed in this case?
>
> On Sun, 10 Mar 2024, 17:20 Holger Jakobs, <holger(at)jakobs(dot)com> wrote:
>
>> Am 10.03.24 um 12:19 schrieb Rajesh Kumar:
>> > Hi ,
>> >
>> > I have a table where size is increasing daily. In that table only
>> > inserts and deletes happens. This table is referencing 15 other
>> > tables. We have given delete cascade, so if a row is deleted in parent
>> > table, the matching records will also be deleted in those child tables.
>> >
>> > It is taking lot of time to delete. So, I am planning to create index
>> > on those child tables.
>> >
>> > My question is, apart from inserts, I am only going to delete records
>> > from those tables. How index improves performance for deleting
>> > records? How index is affected or how to do index management in this
>> case?
>>
>> Hi,
>>
>> Since every single row which is going to be deleted in the child tables
>> has to be found, an index can be of great help here.
>>
>> Actually, in most (not all!) cases an index on foreign key columns makes
>> sense.
>>
>> Regards,
>>
>> Holger
>>
>> --
>> Holger Jakobs, Bergisch Gladbach, Tel. +49-178-9759012
>>
>>