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- Path: sparky!uunet!spool.mu.edu!agate!usenet.ins.cwru.edu!alpha.ces.cwru.edu!yangying
- From: yangying@ces.cwru.edu (Ying Yang)
- Newsgroups: comp.databases.sybase
- Subject: Re: recovery time at start up
- Date: 1 Jan 1993 21:16:15 GMT
- Organization: Agency Rent-A-Car
- Lines: 25
- Message-ID: <1i2cavINN9li@usenet.INS.CWRU.Edu>
- References: <1992Dec28.181641.4653@trdlnk.uucp>
- NNTP-Posting-Host: easy.ces.cwru.edu
-
- In article <1992Dec28.181641.4653@trdlnk.uucp> jay@trdlnk.uucp (Jay Twery) writes:
- >I don't understand the following, we are using
- >ver. 4.8 on a Sparc platform with around 2GB of data, with
- >disk mirroring turned on.
- >
- >After a recent (clean) shutdown of the server, it took
- >50 minutes for the server to start up. The entire
- >time the log said recovering database xxx.
- >
- >Why should it take any time to restart after a normal
- >shutdown? Is the disk mirroring causing a problem?
- >Tech support said it could take 2 hours to recover the
- >database, even though it shutdown with no errors.
- >Does this make any sense?
- >We never experienced this befor 4.8, but we also were
- >not doing any disk mirroring.
-
-
- When a server is restarted, the server first rolls back all the
- transactions after the beginning of the *oldest* open transaction,
- and then repeat all the closed ones in these transactions. So the
- recover time is not only related to the size of the open transactions,
- but also to the beginning time of the oldest open transaction.
-
- Hope this helps.
-