How to back up data in oracle database

How to back up data in Oracle database

1. RMAN backup

Recovery Manager (RMAN) is a built-in backup tool provided by Oracle. Here are the steps to back up data using RMAN:

• Connect to the Oracle database.
• Create a backup set.
• Add the data files or table spaces to be backed up.
• Perform backup operation.

2. EXP/IMP Export and Import

EXP and IMP utilities are used to export and import data. Here are the steps:

• Export the data using the EXP utility.
• Use the IMP utility to import the exported data.

3. Database replication

Database replication creates a copy of the database and keeps the copy synchronized with the source database. Here are the steps:

• Create the database on the target server.
• Configure replication on the source database.
• Configure replication on the target database.

4. Data Pump Export and Import

Data Pump is a backup and recovery tool introduced in Oracle 10g. Here are the steps:

• Export data on the source database.
• Import the exported data on the target database.

5. Logical backup

Logical backup creates data structures and textual representations of the data. Here are the steps:

• Get the DDL for tables and indexes using the DBMS_METADATA.GET_DDL package.
• Use the DBMS_METADATA.GET_DATA package to retrieve data.

Choose the appropriate backup method

Choosing the appropriate backup method depends on database size, performance requirements, and availability needs. Here are some guidelines:

• #RMAN: Suitable for full backup and recovery of large databases.
• EXP/IMP: Suitable for logical backup and recovery of small to medium-sized databases.
• Database Replication: Suitable for business-critical applications that require high availability.
• Data Pump: Provides faster backup and recovery than RMAN, but the functionality may be more limited.
• Logical backup: Suitable for situations where data structures and data text representations need to be created.

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