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- Path: sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!hplabs!ucbvax!lrw.com!leichter
- From: leichter@lrw.com (Jerry Leichter)
- Newsgroups: comp.os.vms
- Subject: re: sysuaf.dat corruption
- Message-ID: <9301211347.AA07157@uu3.psi.com>
- Date: 21 Jan 93 12:47:00 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Distribution: world
- Organization: The Internet
- Lines: 50
-
-
- I wanted to compress my sysuaf file, but when I tried to use anal to
- generate and fdl file, it failed.
-
- This is an odd description of the problem. Has the SYSUAF been functioning
- normally? I.e., did you find the error only when you used ANALYZE, or was
- something acting up before then.
-
- There seems to be some file
- corruption. Does any one know how this corruption could of come about
-
- It doesn't happen, but files do get corrupted, usually because of system
- crashes or power failures at JUST the wrong moment.
-
- or how to repair it.
-
- You can usually simply CONVERT the file to an identical copy of itself. If
- that fails, convert it to a sequential file, then convert the sequential file
- back to an indexed file.
-
- We are a university with over a thousand active
- accounts I do not want to have to reregister every user.
-
- If all else fails, get a copy of your SYSUAF.DAT off a backup. You DO back
- it up, I hope?
-
- Here is part of the report:
- $ ANAL/RMS/CHECK X.DAT/OUT=UAF.REPORT
-
- ...
-
- *** VBN 215: SIDR pointer extends past end of SIDR record.
- Unrecoverable error encountered in structure of file.
-
-
- The analysis uncovered 2 errors.
-
- So why does your excerpt show only one?
-
- Anyhow: The particular error tells us little except that, indeed, the file
- somehow got damaged.
-
- If the error is in the index structure only, converting to sequential and
- back again will fix it. If the error is in a data block, it's generally
- possible to write a simple program to read through the file, skipping over
- the bad data, and recreate all of it except the damaged part. Your problem
- seems to be of the first variety, and to apply to a secondary key to boot.
-
- -- Jerry
-
-