Hence it is written as 1f00 which becomes 00001f. This is a 32 bit, unsigned, little endian number. Let's take a look at our file in binary, jumping straight to the comment section. It details the header format in 32 bit clumps. The Opus File API gives some idea about the binary structure of the file.īut the real magic happens in the Opus Forumat Specification RFC. I can't find a way to stop those being generated by opusenc. Running opusinfo example.opus gives: New logical stream (#1, serial: 03fe3cc9): type opusĮncoded with libopus 1.3.1, libopusenc 0.2.1ĮNCODER_OPTIONS=-bitrate 6 -comp 10 -framesize 60 -padding 0 It edits the file immediately - so be careful!īut what is it actually doing? I wanted to understand a bit more - so let's go hex diving! What the user sees Using the amazing Mutagen Python library I was able to completely strip out all the metadata! import mutagen But the opusenc tool automatically adds metadata - even if you don't specify any. ![]() The sort where every single byte matters. A 'DELETE EXPIRED' command will then delete the 'expired' records from the control file.I'm trying to create some ridiculously tiny audio files. If the file is found to be missing (someone deleted it outside of rman) the record in the control file is marked 'expired'. CROSSCHECK simply looks at those records in the control file and verifies that the referenced file (backup piece or archivelog) actually exists. When rman makes a backup, or the archiver writes an archivelog, a record of such is made in the control file. What do you think CROSSCHECK actually does? See if any backupsets have a 'keep until' date.Īlso, you say that *without* DELETE EXPIRED my CROSSCHECK command is useless, right? Do a LIST BACKUP and examine the results closely. Off-hand the only other explanation would be that those older backups have a KEEP retention on them. left?)Įven with a weekly full backup, with a 14 day recovery window, today you should have backups dating back to at least May 11, and what I explained was to address a common mis-conception about backup retention. You only said you had backups to May 1, etc. You are telling me that backups, say, 50 days old are not obsolete due to recovery window of 14 days? How can that be, since between (today) and (today-50 days) I have at least 7 full backups? ![]() When I login to RMAN and run REPORT OBSOLETE RECOVERY WINDOW OF 14 DAYS, it shows nothing. I read the documentation for quite a while but I'm still confused how the things actually work. Bunch of backup files from recent months stay and I'm running out of disk quota. The problem is that only few backup files are deleted. The retention policy is set to REDUNDANCY 1. I run 2 scripts in crontab, weekly and daily.ĬONCHANNEL DEVICE TYPE DISK FORMAT '/disk01/backup/hellprod/rman/%d_%D-%M-%Y_%U_databse' ĬONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO COMPRESSED BACKUPSET ĬONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/disk01/backup/hellprod/rman/%d_%F_controlfile.bck' īackup incremental level 0 cumulative database īACKUP ARCHIVELOG ALL NOT BACKED UP 2 TIMES ĭELETE NOPROMPT ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE - 3' ĭELETE NOPROMPT OBSOLETE RECOVERY WINDOW OF 14 DAYS īackup incremental level 1 cumulative database
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