Iroducio

Oracle daabase is oe of he mos widely used relaioal daabase maageme sysems. However, someimes daa loss or corrupio ca occur due o various reasos. I such cases, i is impora o kow how o recover he los or corruped daa. I his aricle, we will discuss how o recover able daa usig SQL i Oracle.。

Sep 1: Ideify he Cause of Daa Loss or Corrupio

The firs sep i recoverig los or corruped daa is o ideify he cause of he problem. This ca be due o a variey of reasos such as hardware failure, sofware bugs, huma error, or malicious aacks. Oce he cause is ideified, appropriae measures ca be ake o preve such icides from happeig i he fuure.。

Sep 2: Resore he Daabase from Backup

If a rece backup of he daabase is available, i is recommeded o resore i o he poi before he daa loss or corrupio occurred. This will esure ha all he daa is resored o is origial sae. However, if a backup is o available or if i is o possible o resore i, he we ca proceed o he ex sep.。

Sep 3: Recover he Los or Corruped Daa

Oracle provides various mehods o recover los or corruped daa, such as usig he flashback feaure, usig daabase poi-i-ime recovery, or usig SQL queries. I his aricle, we will focus o how o recover able daa usig SQL.。

Sep 4: Ideify he Affeced Tables

The ex sep is o ideify he ables ha are affeced by he daa loss or corrupio. This ca be doe by checkig he daabase log files or by usig he Oracle Recovery Maager (RMA) ool. Oce he affeced ables are ideified, we ca proceed o he ex sep.。

Sep 5: Recover he Daa Usig SQL

ow we ca sar recoverig he los or corruped daa usig SQL. The firs sep is o creae a ew able wih he same srucure as he affeced able. We ca do his usig he CREATE TABLE saeme.。

ex, we eed o iser he daa from he backup able io he ew able. We ca do his usig he ISERT ITO saeme wih he SELECT saeme. The SELECT saeme should rerieve he daa from he backup able.。

Fially, we eed o updae he affeced able wih he daa from he ew able. We ca do his usig he UPDATE saeme wih he JOI saeme. The JOI saeme should joi he affeced able wih he ew able usig he primary key.。

Coclusio

I his aricle, we discussed how o recover able daa usig SQL i Oracle. We saw he various seps ivolved i he process, such as ideifyig he cause of daa loss or corrupio, resorig he daabase from backup, ideifyig he affeced ables, ad recoverig he daa usig SQL. By followig hese seps, we ca recover los or corruped daa ad esure he smooh fucioig of he Oracle daabase.。

Keywords: Oracle daabase, daa loss, daa corrupio, recovery, SQL, able daa。