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Postgres Gets Confused! 2+ messages / 2 participants [nested] [flat]
* Postgres Gets Confused! @ 1994-10-25 06:27 Robert.Patrick@cs.cmu.edu 1994-10-25 07:46 ` Re: Postgres Gets Confused! Paul M. Aoki <aoki@cs.berkeley.edu> 0 siblings, 1 reply; 2+ messages in thread From: Robert.Patrick@cs.cmu.edu @ 1994-10-25 06:27 UTC (permalink / raw) To: legacy We are using Postgres to store the data for our information modeling program. In doing this, each user has his own PGDATA directory which is served by his own postmaster (obviously running on different ports). The problem we keep seeing is that, after using the database successfully for a period of time, Postgres seems to get confused and do one of the following: 1.) Claims the user is not a valid user even though they have been using the system not 5 minutes before. 2.) Claims the database does not exist even though they had been using it not 5 minutes earlier and it is still listed under the base subdirectory. Most of the time, I can cure this problem by logging in removing the user and re-adding them. Unfortunately, this does not always work and we have had to destroy the PGDATA directory and recreate it from scratch. Which is definitely not desirable since it's not too useful for a user to store their information in our system just to have it destroyed because Postgres gets confused. Also, there seems to be a bug in the parser/planner. First, it tells me that I must use an explicit cast (see below), which makes perfect sense. Then, I use an explicit cast and it tells me that I cannot do cast this expression (huh?). Then, I rewrite the query to include another field in the where clause, along with the EXACT same field that I tried to cast in the previous query (which Postgres said I couldn't do) and it works as expected. paneer> monitor Welcome to the POSTGRES terminal monitor Go * retrieve (pg_operator.oprname) where pg_operator.oprleft = 16\g Query sent to backend is "retrieve (pg_operator.oprname) where pg_operator.oprleft = 16" NOTICE:Oct 25 02:09:05:there is no operator = for types oid and int4 NOTICE:Oct 25 02:09:05:You will either have to retype this query using an NOTICE:Oct 25 02:09:05:explicit cast, or you will have to define the operator WARN:Oct 25 02:09:05:= for oid and int4 using DEFINE OPERATOR Go * retrieve (pg_operator.oprname) where pg_operator.oprleft = 16::oid\g Query sent to backend is "retrieve (pg_operator.oprname) where pg_operator.oprleft = 16::oid" WARN:Oct 25 02:09:17:parser_typecast: cannot cast this expression to type "oid" Go * retrieve (pg_operator.oprname) where pg_operator.oprname = "<" and pg_operator.oprleft = 16::oid\g Query sent to backend is "retrieve (pg_operator.oprname) where pg_operator.oprname = "<" and pg_operator.oprleft = 16::oid" --------------- | oprname | --------------- | < | --------------- Go * Looks like a bug(s) to me, don't you think? Robert P.S. I'm running Version 4.2 with all of the latest patches on OSF/1 1.3, OSF/1 2.0, HP-UX 9.03, SunOS 4.13, and Ultrix 4.2a. All platforms experience the same problems! ============================================================================== To add/remove yourself to/from the POSTGRES mailing list: send mail with the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU" If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and a human will deal with it. DO NOT post to the "postgres" mailing list. ============================================================================== ^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Postgres Gets Confused! 1994-10-25 06:27 Postgres Gets Confused! Robert.Patrick@cs.cmu.edu @ 1994-10-25 07:46 ` Paul M. Aoki <aoki@cs.berkeley.edu> 0 siblings, 0 replies; 2+ messages in thread From: Paul M. Aoki @ 1994-10-25 07:46 UTC (permalink / raw) To: Robert.Patrick@cs.cmu.edu; +Cc: legacy Robert.Patrick@cs.cmu.edu writes: > 1.) Claims the user is not a valid user even though they have been using > the system not 5 minutes before. > 2.) Claims the database does not exist even though they had been using > it not 5 minutes earlier and it is still listed under the base > subdirectory. > Most of the time, I can cure this problem by logging in removing the > user and re-adding them. most of the time when i used to see this it was the funny PGUSER environment variable corruption thing. if you already patched around that one then i'm not sure what it is. try killing the postmaster and restarting it (without blowing away the old database) and see if that clears up the problem temporarily. (there was a problem with the fact that when you destroydb then createdb you sometimes leave the shared memory buffer pool in a funny state. i don't think this was ever resolved.) > Also, there seems to be a bug in the parser/planner. First, it tells me > that I must use an explicit cast (see below), which makes perfect sense. > Then, I use an explicit cast and it tells me that I cannot do cast this > expression (huh?). > * retrieve (pg_operator.oprname) where pg_operator.oprleft = 16::oid\g shameful to say, retrieve (pg_operator.oprname) where pg_operator.oprleft = "16"::oid\g works.. -- Paul M. Aoki | University of California at Berkeley aoki@CS.Berkeley.EDU | Dept. of EECS, Computer Science Division (#1776) | Berkeley, CA 94720-1776 ============================================================================== To add/remove yourself to/from the POSTGRES mailing list: send mail with the subject line ADD or DEL to "postgres-request@postgres.Berkeley.EDU" If this fails, send mail to "post_questions@postgres.Berkeley.EDU" and a human will deal with it. DO NOT post to the "postgres" mailing list. ============================================================================== ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~1994-10-25 07:46 UTC | newest] Thread overview: 2+ messages (download: mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 1994-10-25 06:27 Postgres Gets Confused! Robert.Patrick@cs.cmu.edu 1994-10-25 07:46 ` Paul M. Aoki <aoki@cs.berkeley.edu>
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