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The information can be obtained using SQL*Plus, or with Database Control Using SQL*Plus, these queries would do:
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select group#,members from v$log; select count(*) from v$controlfile; select log_mode from v$database; select archiver from v$instance; select count(*) from v$parameter where name like 'log\_archive\_dest\__' or name like 'log\_archive\_dest\___' escape '\' and value is not null; select value from v$parameter where name= fast_start_mttr_target ; select value from v$parameter where name= db_recovery_file_dest ;
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If the database is the default database created by DBCA and the exercises have been completed as written, the results of these queries will show that there are two problems: the online redo log file groups are not multiplexed and neither are the archive redo log files
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Performing Database Backups
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1601 1602 1603 1604 Create Consistent Database Backups Back Up Your Database Without Shutting It Down Create Incremental Backups Automate Database Backups 1605 Manage Backups,View Backup Reports, and Monitor the Flash Recovery Area Two-Minute Drill Self Test
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Performing Database Backups
ackups can be made with operating system utilities such as cp, tar, or cpio on Unix or copy or winzip32exe on Windows Backups made in this fashion are known as user-managed backups Alternatively, backups can be made with RMAN, the Recovery Manager Backups made in this fashion are known as server-managed backups When making a database backup, you have three basic choices Will the backup be
Offline or online
Also known as: open or closed, hot or cold, and consistent or inconsistent Will you make the backup while users are logged on and working, or is the database going to shut down while you make the backup
Whole or partial
A whole backup means the complete database: the entire set of datafiles and the controlfile A partial backup is a subset of the database: one or more datafiles and/or the controlfile A full backup is complete, self-contained, and usable by itself An incremental backup is those blocks changed since the last backup; it is useless unless you have the last backup too
Full or incremental
All combinations of these options are valid if your database is in archivelog mode and you make server-managed backups If your database is in noarchivelog mode, your choice is restricted to closed-whole-full or (if you use RMAN) closed-whole-incremental; you cannot make open or partial backups in noarchivelog mode If you do not use RMAN, you cannot make incremental backups: user-managed backups can be open or closed and whole or partial, but they must be full The second DBA OCP examination goes into much greater detail regarding backup and restore and recovery operations For the first examination, only basic knowledge is tested no advanced options, and testing is largely done with the Database Control graphical interface One point that may well be tested is using Database Control to automate backups Some Linux distributions include a utility called rman If you get bizarre messages when running server-managed backups, it could be that your search path is finding this utility, not the Oracle utility Make sure that your search path has $ORACLE_HOME/bin at the beginning to avoid this
Create Consistent Database Backups
CERTIFICATION OBJECTIVE 1601
Create Consistent Database Backups
An offline backup is backup taken while the database is closed You may hear offline backups referred to as closed, cold, or consistent backups The term closed is selfexplanatory and cold is just slang, but consistent requires an understanding of the Oracle architecture For a datafile to be consistent, every block in the datafile must have been checkpointed, and the file closed by the operating system In normal running, the datafiles are inconsistent: there will be a number of blocks that have been copied into the database buffer cache, updated, and not yet written back to disk The datafile itself, on disk, is therefore not consistent with the real-time state of the database; some parts of it will be out of date To make a datafile consistent, all changed blocks must be flushed to disk, and the datafile closed As a general rule, this happens only when the database is shut down cleanly, with the IMMEDIATE, TRANSACTIONAL, or NORMAL shutdown options An online backup is a backup taken while the database is in use Other terms for online backups are open, hot, or inconsistent backups A datafile that is backed up online will not be synchronized with any particular SCN, nor is it synchronized with the other datafiles or the controlfile It is backed up while it is in use being read from by server processes and written to by DBWn
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