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- Xref: sparky comp.databases:7767 comp.databases.ingres:1852
- Newsgroups: comp.databases,comp.databases.ingres
- Path: sparky!uunet!dcatlas!sethg
- From: sethg@dcatlas.dot.gov (Seth Grimes)
- Subject: Re: Ingres questions
- Message-ID: <1992Nov11.180040.7771@dcatlas.dot.gov>
- Organization: U.S Dept. of Transportation
- References: <10NOV199217373383@stars.gsfc.nasa.gov>
- Distribution: usa
- Date: Wed, 11 Nov 1992 18:00:40 GMT
- Lines: 35
-
- thompson@stars.gsfc.nasa.gov (William Thompson, code 682.1, x2040) writes:
-
- >First of all, I understand that Ingres has a limit of ~2000 bytes per record.
- >I know they have a way to incorporate large text fields in the database, but
- >what about the situation where one just has a large number of different fields,
- >none of which is large by itself, but the total sum is greater than 2000? The
- >salesman claimed this wasn't a problem, but he couldn't explain why. Has
- >anybody run into this problem, or know of a way to get around it? Is it a real
- >problem with Ingres?
-
- I don't know of any workaround other than vertically partitioning your tables.
- On the other hand, Ingres 6.5 to be released in the spring will support BLOBs
- and presumably remove the 2000-byte limit (based on Ingres's current page
- size of 2048 bytes) on general fields.
-
- >What about importing and exporting text files? This is something that's going
- >to be important for us. Are there any limitations involved with Ingres and
- >importing/exporting text files? Are there problems doing this in a VMS
- >environment?
-
- No problems at all once you get used to the formatting conventions of the
- COPY command.
-
- >Another question I have is about row level locking. Somebody I was talking to
- >claimed that Ingres does not have row level locking. However, since his only
- >real experience is with the old public-domain version, I'm somewhat dubious
- >about this claim. Is this true, or just a rumor?
-
- No, it doesn't, but then I think rll is important only in a heavy-traffic
- transaction processing environment. Basic Ingres locking is page level,
- with escalation as needed. Of course, you get rll if your rows take up
- most of a data page. :-) Do you really need it?
-
- Seth Grimes, dcatlas!sethg@uunet.uu.net
- Automated Sciences Group (U.S. Dept. of Transportation)
-