| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
| Cc: | Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Dunstan <pgsql(at)tomd(dot)cc>, Brendan Jurd <direvus(at)gmail(dot)com>, Bruce Momjian <momjian(at)postgresql(dot)org>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Re: [COMMITTERS] pgsql: Update: < * Allow adding enumerated values to an existing |
| Date: | 2008-04-26 17:33:01 |
| Message-ID: | 13301.1209231181@sss.pgh.pa.us |
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| Lists: | pgsql-committers pgsql-hackers |
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> Alvaro Herrera wrote:
>> Another alternative would be internally creating a different temporary
>> enum, rewriting the tables one by one each on its own transaction, and
>> finish by dropping the original enum and renaming the temporary one.
>> This solves the deadlock problem.
> What happens when someone tries to join two of the tables, one that has
> been converted and one that hasn't? You might not have deadlock, but you
> won't have type integrity either, ISTM.
Not to mention the mess you'll be left with if the process fails after
converting some of the tables.
regards, tom lane
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