TYPES OF BACKUP AND RECOVERY

TYPES OF BACKUP AND RECOVERY http://oracle.filerepairtool.net/blog/types-backup-oracle-recovery

About Oracle database is a well known database that provides complete solution over storing and managing a large amount of relational data with ease. It is an intelligent database but sometime you may face errors and other issues that prevents you to access your stored information, to get rid of these it is suggested to create backup of your database and update them on regular basis. With the help of backup you can deal with all types of errors and corruption issues. Oracle contains four different types of backups through which you can create the backup of your database.

Types of backups in Oracle Database. 1. Cold backup: 2. Hot backup: 3. RMAN Backup: 4. Import – Export Backup:

1. Cold backup: This backup is helpful if your database is in noarchive log mode, to create a cold backup apply the below given steps: Step 1: First close the database with the help of “Sql>shutdown immediate;” command Step 2: After it copy the data files, control files and redolog files to your desired destination manually. Step 3: Start the database with the help of “Sql>startup;” command

2. Hot backup: This backup method is used when database is in archive log mode. Apply the below given steps to create hot backup without any database outage. Step 1: Run the below given commands in order to get the logs for hot backup in separate logfile. Step 2: Sql>alter database begin backup;

Step 3: Copy data files, control files and redo log files manually to your desired destination without closing the database. Step 4: Close the hot backup by running the command: Sql>alter database end backup; Step 5: After completion of hot backup switch the log file. Use below given command: Sql>alter system switch logfile; Copy archive files which is used to recover the database. Copy this command to recover database: sql>recover database using contolfile autobackup untill cancel;

3. RMAN Backup: 1. RMAN Without recovery catalog: Note:Database should be in archivelog mode. Step 1: Apply this command: RMAN>backup database; Step 2: To create backup of tablespace use the below command Rman>backup tablespace tablespace_name;

Step 3: To create backup of datafile copy the following command.Rman>backup datafile ‘C:\oracle\product\10.2.0\oradata\orcl\datafile_name’;All these backups will get stored in flash_recovery_area by default.

4. Import – Export Backup: Data guard is the new feature of Oracle that allows the user to transfer data from one location to another at high speed. It is packed with two utilities: • Export utility • Import Utility Export utility: With the help of this tool one can store the database objects in the storage media like disks outside the database. Import Utility: This allows the user to load the objects to the database from the storage media.

Export operation: Step 1: First create a directory, use C:\>mkdir c:\backup Step 2: After it connect to the database and create the directory for backup Sql>create directory backup as ‘c:\backup’; The directory created. Step 3: Move to the host mode. Sql>host

Step 4: Navigate to the directory • C:\oracle\product\10.2.0\db_1\BINC:\>cd C:\oracle\product\10.2.0\db_1\BIN • Step 5: Run the export command. • C:\oracle\product\10.2.0\db_1\BIN> expdp sys/test directory=bkupdumpfile=bfull.dmp logfile=bfull.log full=y • In order to run import operation execute the below given command. • C:\oracle\product\10.2.0\db_1\BIN> impdp sys/test directory=bkupdumpfile=bfull.dmp logfile=bfull.log full=y

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TYPES OF BACKUP AND RECOVERY