Which log file can be removed safely?

The directory /private/var/log uses about 4.5 Gig of disk space, about half of which is used by /private/var/log/asl.
My question now is: which of these can I delete?
I assume, I can't delete the files *.log.
But what about *.log.bz2 - they should be OK to delete, shouldn't they?
And what about the files in /private/var/log/asl ?
Thanks a lot in advance for all insights.
Best regards,
Gabriel.

GabrielZ wrote:
Ah, that is good to know.
Yes, indeed, I always put my laptop to sleep during the night.
Is there any way I can make these scripts also run, say, once a week during the day?
Best regards,
Gabriel.
You're welcome. If the computer is not shut down, they are set to run in the middle of the night, or when the computer next wakes up. It's really easy to run the scripts in Terminal. Look in Activity Monitor (Applications>Utilities) for that runaway process.

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Log files can't be removed automatically in HA environment

Hi BDB experts,
I am writing db HA application based on bdb version 4.6.21. Two daemons run on two machines, one as master which will read/write db, one as client/backup will only read db. There is one thread in master daemon that run checkpoint every 1 second: dbenv->txn_checkpoint(dbenv, 1, 1, 0), and dbenv->log_archive(dbenv, NULL, DB_ARCH_REMOVE) will be called after runnng checkpoint each time. The env was open with flag: DB_CREATE | DB_INIT_TXN | DB_INIT_LOCK | DB_INIT_LOG | DB_REGISTER | DB_RECOVER | DB_INIT_MPOOL | DB_THREAD | DB_INIT_REP; Autoremove flag was set by: envp->set_flags(uid_dbs.envp, DB_LOG_AUTOREMOVE, 1) before open env.
I found this thread https://forums.oracle.com/message/10945602#10945602 which discussed about non-ha environment, and I tested my code in a non-ha env without DB_INIT_REP, it worked. However in HA env those log files were never removed. Could you help on this issue? Does the client need to run checkpoint? May there be a bdb bug?
Thanks,
Min

There is one thread in master daemon that run checkpoint every 1 second: dbenv->txn_checkpoint(dbenv, 1, 1, 0), and dbenv->log_archive(dbenv, NULL, DB_ARCH_REMOVE) will be called after runnng checkpoint each time. The env was open with flag: DB_CREATE | DB_INIT_TXN | DB_INIT_LOCK | DB_INIT_LOG | DB_REGISTER | DB_RECOVER | DB_INIT_MPOOL | DB_THREAD | DB_INIT_REP; Autoremove flag was set by: envp->set_flags(uid_dbs.envp, DB_LOG_AUTOREMOVE, 1) before open env.
I am not saying that this is causing a problem, but doing the DB_ENV->log_archive(DB_ARCH_REMOVE) in your thread and setting DB_ENV->set_flags(DB_LOG_AUTOREMOVE) is redundant. In your thread, you control the timing. The DB_ENV->set_flags(DB_LOG_AUTOREMOVE) option checks for and removes unneeded log files when we create a new log file.
Did you see in the documentation for DB_ENV->set_flags(DB_LOG_AUTOREMOVE) that we don't recommend doing automatic log file removal with replication? Although this warning is not repeated in DB_ENV->log_archive(DB_ARCH_REMOVE), it also applies to this option. You should reconsider using this option, particularly if it is possible that your client could go down for a long time.
But this is only a warning and automatic log removal should work. My first thought here is to ask whether your client has recently gone through a sync? Internally, we block archiving on the master during some parts of a client sync to improve the chances that we will keep around all logs needed by the syncing client. We block archiving for up to 30 seconds after the client sync.
I found this thread https://forums.oracle.com/message/10945602#10945602 which discussed about non-ha environment, and I tested my code in a non-ha env without DB_INIT_REP, it worked. However in HA env those log files were never removed.
This thread is discussing a different issue. The reason for our warning in BDB 4.6 against using automatic log removal with replication is that it doesn't take into account all the sites in your replication group, so we could remove a log from the master that a client still needs.
We added replication group-aware automatic log removal in BDB 5.3 Replication Manager, and this discussion is about a change of behavior from this addition. With this addition, we no longer need to recommend against using automatic log removal with replication in BDB 5.3 and later releases.
Could you help on this issue? Does the client need to run checkpoint? May there be a bdb bug?
I'm not sure the client needs to run its own checkpoints because it performs checkpoints when it receives checkpoint log records from the master.
But none of the log removal options on the master does anything to remove logs on the client. You will need to perform steps to archive logs separately on the client and the master.
Paula Bingham
Oracle

System.out.println in which log file

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If you are running a shell script (not as as service) you will see it in
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          -----Ursprüngliche Nachricht-----
          Von: smita [mailto:[email protected]]
          Bereitgestellt: Mittwoch, 6. Juni 2001 18:54
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          Unterhaltung: System.out.println in which log file
          Betreff: System.out.println in which log file
          We are using weblogic 51 server.
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Log files can be applied after an offline backup is restored?

When reading the Admin Guide I see above possibility.
I guess in that case the offline backup must be done in the Database Maintenance Mode: QUIESCE.
I think if the offline backup is done after the DB is shutdown, no log files can be applied.
Would you please confirm and share your experience on this?
Thanks a lot!

Hi Jennifer,
only to complete the answer of Jens, or "say" it less complex:
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Can I remove safely Photoshop CS5 after a successful upgrade to Photoshop CS6?

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What log files can delete in RAC?

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I didn't used "delete input" option when backup the archivelog files. So all archivelog files still remain on the file system. How can I identily which archivelog files I can delete using the command
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Commit Completes although current online redo log file have been removed.

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Javid wrote:
Although i have removed current online redo log file in linux os (Oracle Linux),when i type "commit" it says that "commit complete".
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Log files not being removed.

Hello,
I've upgraded an application from BerkeleyDB 5.1.25 to 5.3.21, and after that, log files are no more automatically removed. This is the only change in the application. It's an application written in C.
The environment of the application is created with the flag DB_LOG_AUTO_REMOVE
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So far, so good, with version 5.1.25, this was enough to remove unused log files (I don't need to be able to do catastrophic recovery). But this doesn't work anymore with version 5.3.21.
I I run db_archive (no options), it shows nothing, suggesting that all log files are still needed. But if I run db_hot_backup on the database, all but the last logfiles are removed (on the backup) as wanted.
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Thanks for your help
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Edited by: user564597 on Mar 24, 2013 6:35 PM
Edited by: user564597 on Mar 24, 2013 6:38 PM
Edited by: user564597 on Mar 25, 2013 8:57 AM

thank you for giving us a test program. This helped tremendously to fully understand what you are doing. In 5.3 we fixed a bug dealing with the way log files are archived in an HA environment. What you are running into is the consequences of that bug fix. In the test program you are using DB_INIT_REP. This is the key to use that you want an HA environment. With HA, there is a master and some number of read only clients. By default we treat the initiating database as the master. This is what is happening in our case. In an HA (replicated) environment, we cannot archive log files until we can be assured that the clients have applied the contents of that log file. Our belief is that you are not really running in an HA environment and you do not need the DB_INIT_REP flag. In our initial testing where we said it worked for us, this was because we did not use the DB_INIT_REP flag, as there was no mention of replication being needed in the post.
Recommendation: Please remove the use of the DB_INIT_REP flag or properly set up an HA environment (details in our docs).
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mike

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Hi there,
My message was borne of 2 days frustration out of nearly a year of smooth operations with Oracle App Server. Unfortunately I let my mouth (or fingers) run off with those frustrations and made a post that was innappropriate and un-necessary and like every bad workman I blamed my tools.
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I had mysql running and used it for quite a while.
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Quite a mistake I assume; since now I can't start mysql(d) anymore.
I've tried a lot by now:
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Disclaimer: I tried for many hours now, but since I'm quite new - I don't have a clue anymore what to do.

These are systemd, not mysql errors, and are quite useless as such -- you already know that mysql does not work Look for /var/log/mysqld.log or $datadir/<hostname>.err -- next time, of course, 'cos there's just one thing to do now: restore your mysql data folder, as there should be much more than binary logs Or, should you prefer to start from scratch, try to use mysql_install_db and then start mysql again.
For future reference, you can safely delete old binary logs from inside mysql using PURGE MASTER LOGS command, and/or consider using expire_logs_days config option.

Which log file can be removed safely?

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