home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!gossip.pyramid.com!pyramid!infmx!davek
- From: davek@informix.com (David Kosenko)
- Newsgroups: comp.databases.informix
- Subject: Re: Negative PIDS, and SE/Online questions
- Message-ID: <1993Jan11.220300.16666@informix.com>
- Date: 11 Jan 93 22:03:00 GMT
- References: <1isconINN965@emory.mathcs.emory.edu>
- Sender: news@informix.com (Usenet News)
- Organization: Informix Software, Inc.
- Lines: 48
-
- Naomi Walker writes:
- >
- >Hey, all you Informix gurus.....
- >
- >I have two questions. The following is an excerpt from the Informix error
- >log on a Pyramid MIS-S server, runing 4.1 UC1 Online and 4.1 UC1 ESQL/C.
- >I've seen these negative pid's and funky user numbers before, and sloughed
- >them off as programming boo-boos. All I really know is that we had a
- >scheduled reboot of this machine, for another reason. Anyone seen this
- >negative pid and user id before or have any comments?
-
- When tbinit detects that a user's server process has died, it marks the pid
- in the user structure as negative. I'm not sure why it should do this,
- other than to flag that it is a problem.
-
- Once upon a time, this also showed up as a result of a real problem on
- AIX: IBM used 64bit userids, whereas we used 2 bytes to track it in
- shared memory; when the pid got too high, it showed up as a negative
- number. This was the only platform, that I know of, where this was the
- case.
-
- >My next question is about SE. I am very familiar with all the Informix
- >tools available to me when using Online. I am not familiar with SE.
- >In general, are the same or equivalent tools available when using the
- >standard engine (tbcheck)? How about all the sql statements, like
- >$ SET EXPLAIN ON/OFF, and $ ALTER TABLE to change things like lock modes
- >and next extent?
-
- bcheck is the SE equiv of tbcheck, though it provides less (no equiv
- of the -p options); SET EXPLAIN is available with SE; there are no lock
- modes or extents with SE, so these ALTER TABLE statements do not
- apply. Off the top of my head, the following OnLine items are not
- available with SE:
-
- Isolation levels
- BLOBS
- VARCHARs
- Buffered/Unbuffered Log toggle
- Distributed queries (I-Star)
- Deferred constraints
-
-
- Dave
- --
- Disclaimer: These opinions are not those of Informix Software, Inc.
- **************************************************************************
- "I look back with some satisfaction on what an idiot I was when I was 25,
- but when I do that, I'm assuming I'm no longer an idiot." - Andy Rooney
-