By Darl Kuhn
Oracle RMAN for Absolute rookies is a steady advent to using Oracle's restoration supervisor software program to make backups of an Oracle database, and to revive all or a part of a database within the occasion that information loss happens. it's always acknowledged database administrator's number 1 task accountability is with the intention to get over info loss. in case you are new to the Oracle platform, or you are new to database management normally, you could rarely get it wrong through making it your first precedence to profit to backup and get better the database that has been entrusted into your palms. This publication is brief and candy at simply 2 hundred pages. concentration lies at the mainstream use instances. restoration supervisor, or RMAN because it is named, is a robust and intricate instrument that may be intimidating initially. writer Darl Kuhn is familiar with the necessity to specialize in the center use situations, development your self assurance within the instrument, and on your skill to get over misplaced database records, or even to recuperate all of your database should still that turn into useful.
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- Respects some time via offering example-based options, now not unending studying material
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- permit Oracle Database deal with your backup records through the Flash restoration Area.
- Automate backup and restoration initiatives via writing scripts.
- Troubleshoot RMAN difficulties and optimize RMAN performance.
- Interface with a Media administration Layer to control your backup tape library.
- get over the lack of a regulate dossier, lack of an internet redo log, and different (hopefully! ) strange situations.
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Sample text
Making individual tables read/write can be advantageous when you’re doing maintenance (such as a data migration) and you want to ensure that users don’t update the data. This example modifies a table back to read/write mode: SQL> alter table my_tab read write; Dropping a Tablespace If you have a tablespace that is unused, it’s best to drop it so it doesn’t clutter your database, consume unnecessary resources, and potentially confuse DBAs who aren’t familiar with the database. info Chapter 2 ■ Files in Support of Backup and Recovery Operations You may want to wait to see if anybody screams that an application is broken because it can’t write to a table or index in the tablespace to be dropped.
However, you have to stop and start your database for the LOG_ARCHIVE_FORMAT parameter to take effect. arc' scope=spfile; If you do so, when you attempt to stop and start your database, you won’t even get to the nomount phase (because the spfile contains an invalid parameter): SQL> startup nomount; ORA-19905: log_archive_format must contain %s, %t and %r In this situation, if you’re using an spfile, you can’t start your instance. ora file from the contents of the spfile. ora The prior command will extract the text out of the binary spfile and display it on your screen.
Info Chapter 2 ■ Files in Support of Backup and Recovery Operations Figure 2-2. Redo protected until the modified (dirty) buffer is written to disk At time 1, Block A is read from Data File AA into the buffer cache and modified. At time 2 the redo-change vector information (how the block changed) is written to the log buffer. At time 3 the log-writer process writes the Block A change-vector information to online redo log 1. At time 4 a log switch occurs, and online redo log 2 becomes the current online redo log.