How to restore backup Oracle in PostgreSQL

How do I restore an Oracle database backup quickly and safely?

RESTORE DATABASE/SCHEMA/TABLE re-creates objects and data from an Oracle backup, letting you recover lost information or clone environments.

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Description

Why would I need to restore an Oracle backup?

Use a restore when data is lost, corrupted, or you need to refresh a non-production database with production data. RMAN or Data Pump rebuilds files from backup sets or dump files, preserving integrity.

What tools can I use to restore?

RMAN handles full instance or tablespace recovery; Data Pump (impdp) restores schemas or individual tables. Both support point-in-time recovery (PITR) and selective object import.

How do I restore an entire database with RMAN?

Start the instance in NOMOUNT, allocate channels, then run RESTORE DATABASE followed by RECOVER and OPEN RESETLOGS. This re-creates datafiles from backup pieces.

Example RMAN script

rman target / RUN { ALLOCATE CHANNEL c1 DEVICE TYPE DISK; SET UNTIL TIME "TO_DATE('2024-05-18 23:55','YYYY-MM-DD HH24:MI')"; RESTORE DATABASE; RECOVER DATABASE; ALTER DATABASE OPEN RESETLOGS; }

How do I restore a single table like Customers?

Use Data Pump. First, export from backup, then import only the needed table to a staging schema, and merge or swap.

Data Pump table-level import

impdp system/password \ directory=bkp_dir dumpfile=ecom_full.dmp \ logfile=imp_customers.log \ tables=customers \ remap_schema=prod:staging

How do I restore Orders and related OrderItems?

List both tables in the TABLES parameter, or use INCLUDE=TABLE:"IN \('ORDERS','ORDERITEMS'\)" to keep referential integrity intact.

PITR for a schema

impdp system/password \ directory=bkp_dir dumpfile=ecom_full.dmp \ logfile=imp_pitr.log \ schemas=prod \ flashback_time="TO_TIMESTAMP('2024-05-18 23:55','YYYY-MM-DD HH24:MI')"

Best practices for Oracle restores

Validate backups with RMAN VALIDATE; keep catalog metadata current; always restore to a test instance first; document SCN/time used for PITR; enable block change tracking for faster incremental recovery.

What’s the quickest way to verify the restore?

Run checksums, compare row counts against backup reports, and run quick business queries like total_amount sums in Orders to ensure logical consistency.

How do I automate restores?

Embed RMAN or impdp commands in shell scripts or CI pipelines; parameterize dates and directories; log outputs for auditing.

Why How to restore backup Oracle in PostgreSQL is important

How to restore backup Oracle in PostgreSQL Example Usage


-- Restore Customers and Orders tables into a staging schema for validation
impdp system/Very$tr0ngPwd \
  directory=bkp_dir \
  dumpfile=ecom_full_20240518.dmp \
  logfile=imp_customers_orders.log \
  tables=customers,orders \
  remap_schema=prod:staging \
  table_exists_action=replace \
  include=TABLE:"IN ('CUSTOMERS','ORDERS')"

How to restore backup Oracle in PostgreSQL Syntax


-- RMAN full database restore
RUN {
  ALLOCATE CHANNEL c1 DEVICE TYPE DISK;
  -- Optional: specify SCN or TIMESTAMP for PITR
  -- SET UNTIL SCN 123456789;
  -- SET UNTIL TIME "TO_DATE('YYYY-MM-DD HH24:MI','YYYY-MM-DD HH24:MI')";
  RESTORE DATABASE [FROM TAG backup_tag];
  RESTORE TABLESPACE customers_ts, orders_ts;
  RESTORE DATAFILE 5, 7;
  RECOVER DATABASE;
  ALTER DATABASE OPEN [RESETLOGS | NORESETLOGS];
}

-- Data Pump schema/table restore
impdp <username>/<password> \
  directory=<oracle_dir> \
  dumpfile=<file1.dmp>,<file2.dmp> \
  logfile=restore.log \
  schemas=prod \
  tables=customers,orders,orderitems \
  remap_schema=prod:staging \
  flashback_time="TO_TIMESTAMP('YYYY-MM-DD HH24:MI','YYYY-MM-DD HH24:MI')" \
  table_exists_action={skip|truncate|replace}

Common Mistakes

Ignoring RESETLOGS after PITR: Skipping ALTER DATABASE OPEN RESETLOGS after point-in-time recovery leaves SCN mismatch and prevents archive logging. Always open with RESETLOGS to reset redo sequence.
Importing into the live schema: Running impdp directly into production can overwrite good data. Instead, REMAP_SCHEMA to a staging area, validate, then swap or merge.