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IDS Forum

Re: RE: Re: Re: why total width of all index can't exceed 255?????

Posted By: Ravi Krishna
Date: Tuesday, 25 November 2003, at 9:07 a.m.

>I confess the example is not good. but the real situation is there
>have two names which can decide a unique record(this is Spec, we
>can't change this rule). We have different id for each record, but
>id is for internal use, is transparent to user. So user can only
>give two names to get the unique record. In this case, serial field can't help.
>I can't use two names to find a serial field and use this serial
>field to get a record, can I? As user always use two names to find a
>record, so combined index is the only choice.

I read this couple of times and still could not make it. What exactly
do you want. You can always enforce uniquness using triggers also.
For starters, send the schema of the table in question and tell
what is your requirement. Also mention what fields got to be unique as per
your business requirement.

>Two separate indexes is not a good alternative. Two indexes will
>cause more locks when locking a row.

Cud u explain this bit more.

>It can make situation worse
>than using table lock. when data changed, it will spend double time
>to recreate whole indexes.

What makes you think that having a huge 500 char index (if informix
allows that) will have very fast.

Informix locking is dependent on isolation level. I won't comment on
number of locks till I see the application. Finally, locks by themselves
is not an issue. May be it is an issue in Oracle bcos locks are stored
as part of blocks and there can be only fixed number of locks in a block
(fixed as in table configuration). But Informix acquires locks dynamically
on the fly.


> BTW, Maybe using last name and first name is a good idea for other
> database, but not for informix,

there u go again. Will u reframe the above. The worst you can say is
that using last name/first name is not a good idea for your application.
Don't say 'for informix', bcos I am also using informix and I always
use first/last name separately.

>So, I don't understand why informix has such limitation.

I have an idea. Use Oracle or SQL Server and be happy with them.

rk-

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