By Darl Kuhn
Oracle RMAN for Absolute newbies is a gradual 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 no 1 activity accountability is as a way to get over facts loss. in case you are new to the Oracle platform, or you are new to database management normally, you could not often get it wrong by way of making it your first precedence to benefit to backup and recuperate the database that has been entrusted into your palms. This e-book is brief and candy at simply two hundred pages. concentration lies at the mainstream use situations. restoration supervisor, or RMAN because it is named, is a robust and intricate instrument that may be intimidating first and foremost. writer Darl Kuhn knows the necessity to specialize in the middle use circumstances, construction your self belief within the software, and on your skill to get over misplaced database records, or even to get better your whole database should still that turn into priceless.
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Keep in mind that renaming a tablespace doesn’t rename any associated data files. See the section “Renaming or Relocating a Data File,” later in this chapter, for information on renaming data files. ■■Note You can’t rename the SYSTEM tablespace or the SYSAUX tablespace. Controlling the Generation of Redo For some types of applications, you may know beforehand that you can easily re-create the data. An example might be a data warehouse environment in which you perform direct path inserts or use SQL*Loader to load data.
If you attempt to drop a log group with an active status, Oracle throws an ORA-01624 error, indicating that the log group is required for crash recovery. Issue an ALTER SYSTEM CHECKPOINT command to make the log group inactive: SQL> alter system checkpoint; Additionally, you can’t drop an online redo log group if doing so leaves your database with only one log group. If you attempt to do this, Oracle throws an ORA-01567 error and informs you that dropping the log group isn’t permitted because it would leave you with fewer than two log groups for your database (as mentioned earlier, Oracle requires at least two redo log groups in order to function).
You can modify this parameter while your instance is up; this means you can quickly modify it back to its original setting if there are unforeseen side effects. Finally, consider increasing the value of the DB_WRITER_PROCESSES parameter. Carefully analyze the impact of modifying this parameter in a test environment before you apply it to production. This value requires that you stop and start your database; therefore, if there are adverse effects, downtime is required to change this value back to the original setting.