what 's the difference between databases(db) with log files and without log files?
I used to use a database with log files, but now I must install the database to many client machines, and I find there will be errors when the log file is just copied instead of backuped.so I want to use a database without log files.But will there be any disadvantages? thanks for your help! ps:I find after I backup a database(db) with log files to a database without log files, the new database is useless,I mean I cann't connect to it! Orion
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Orion
10/17/2000 12:31:05 AM
sybase.sqlanywhere.general
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Hi Using a log file will be good, (performance and safety as logs can be used for recovery from corruption) but it must be stored at the location specifed in th DB we have no problems when we copy the DB and Log together on a different machine You can change the location of the log or remove the Log with the DBLOG command but if you have taken an online backup then the log must exist in the original path to allow to to make the change as because when the DB comes up it may rollback/recover prior to doing anything... The last resort is to bring up your online backed up DB with the dbengx/dbsrvx -F (force) switch. In this the DB will come up and go down immediately and then you can bring up again as usual HTH Sanjay sminni_news@minisoftindia.com www.minisoftindia.com "Orion" <remoter@263.net> wrote in message news:Hasa7P9NAHA.201@forums.sybase.com... > I used to use a database with log files, but now I must install the database > to many client machines, and I find there will be errors when the log file > is just copied instead of backuped.so I want to use a database without log > files.But will there be any disadvantages? > > thanks for your help! > > ps:I find after I backup a database(db) with log files to a database without > log files, the new database is useless,I mean I cann't connect to it! > > Orion > > > >
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Sanjay
10/17/2000 6:23:00 AM
I would not recommend this. The disadvantages are great. That log file is not just a convenience, much of the fault-tolerance and speed of SQLAnywhere comes from the log file. They do offer the option of running without a log, but they don't encourage you. If someone switches the machine off in the middle of a database operation, you are a lot better off if you have a log file. In general any transactional database system (other than Interbase) really does need a transaction log to live up to its full promise of reliability and stability. We distribute a lot of databases (100's) and we either shut down the database before copying .db and .log or we just backup the database and make multiple copies of the backup. It really isn't that much trouble and the heavy-duty fault-tolerance is worth it. Some of our users routinely shut down their netware servers by unplugging them! In 5 years we have not had one unrecoverable error. I doubt we would have had the same scenario without a log file. good luck, wilf silversides
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wilf
10/17/2000 4:23:18 PM
Log files are highly recommended for these reasons: 1) Performance 2) Recoverability. If your db should become corrupt, you can go to a backup database and use log files to bring it forward to the current point, losing no data. Regarding your troubles with logs, keep these points in mind: 1) the log goes with the database. If you shut the db down, you can restart a copy of it later without a log at all (in which case it will start a new log) or you can continue to use the same log that was in use when it was shut down. 2) If, when you start the db, it finds a log file that does not match the db, the db will fail to start. By "match" I mean that it must be the log must have the ending offset that the db has recorded in its own table. The db knows what to expect, and accepts no substitutes. 3) the location of the log is specified in the db file, so if the location is "\tranlog\mydb.log" then the log must be located in the "tranlog" subfolder of whatever folder holds the db. 4) Things get a little more complicated with dbbackup, depending upon the options you use. In any case, to open a dbbackup'd database, you need to have the correct log in place. That will usually be the log that was active when dbbackup was run. However, if you have also backed up the tran log, you can use that log, but heed this: do not open the backed-up database for any reason until you have backed up the backup. The reason: opening the db will extend its log file. Then, the db cannot be used for recover with the log file that is still being used as your current live transaction log. Clear as mud? I'll differ with Wilf on one bit. I haven't heard or read anything from Sybase to suggest that the integrity of the database is enhanced through use of the transaction log. In order to get the same integrity from a log-less db, ASA will write dirty pages at every commit. This is what hurts performance in this scenario. >I used to use a database with log files, but now I must install the database >to many client machines, and I find there will be errors when the log file >is just copied instead of backuped.so I want to use a database without log >files.But will there be any disadvantages? >thanks for your help! >ps:I find after I backup a database(db) with log files to a database without >log files, the new database is useless,I mean I cann't connect to it! Leo Tohill - Team Sybase >> Please post in newsgroup, not via email << Useful links: Downloads: http://www.sybase.com/developer/mobile/ Submit Bug Reports: http://casexpress.sybase.com/cx/cx.stm?starturl=casemessage.ssc?CASETYPE=Bug
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leotohill
10/18/2000 12:56:12 AM
> ps:I find after I backup a database(db) with log files to a database without > log files, the new database is useless,I mean I cann't connect to it! for this you can see the thread "online backup database not starting without log 6.sep.00 > > Orion > > > >
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Sanjay
10/18/2000 4:47:38 AM
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