From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | vadim(at)krs(dot)ru (Vadim Mikheev) |
Cc: | hackers(at)postgreSQL(dot)org, darcy(at)druid(dot)net |
Subject: | Re: [HACKERS] unfortunately... |
Date: | 1998-09-25 15:48:30 |
Message-ID: | 199809251548.LAA04205@candle.pha.pa.us |
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Lists: | pgsql-hackers |
> I don't like implementation of referential integrity constraints
> in contrib/spi/refint.* and implementation of ... unique indices:
> backend checks constraints when tuple is changed.
>
> Oracle checks constraints after entire _statement_ is done.
> Do you remember this:
>
> vac=> create table x (a int unique);
> NOTICE: CREATE TABLE/UNIQUE will create implicit index x_a_key for table x
> CREATE
> vac=> insert into x values (1);
> INSERT 143852 1
> vac=> insert into x values (2);
> INSERT 143853 1
> vac=> update x set a = a + 1;
> ERROR: Cannot insert a duplicate key into a unique index
>
> This is simplest case. Keeping in mind triggers
> I would like to see Oracle behaviour some day and so
> I decided to do not implement FOREIGN keys in 6.4 -:((
OK. Removed from open 6.4 items list.
--
Bruce Momjian | http://www.op.net/~candle
maillist(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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