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Iroducio

Oracle is a popular relaioal daabase maageme sysem used by orgaizaios aroud he world. Daa recovery is a impora aspec of daabase maageme ad Oracle provides various ools ad echiques o recover daa i case of accideal deleio or corrupio. I his aricle, we will explore how o recover able daa usig SQL i Oracle.。

Ideifyig he Table

The firs sep i recoverig able daa is o ideify he able from which he daa was deleed or corruped. This ca be doe usig he followig SQL commad:。

SELECT able_ame FROM all_ables WHERE ower = 'schema_ame';。

Replace schema_ame wih he ame of he schema where he able is locaed. This commad will display a lis of all ables i he specified schema.。

Recoverig Daa

Oce he able has bee ideified, we eed o recover he daa. If he daa was recely deleed or updaed, we ca use he Oracle flashback feaure o recover he daa. The followig SQL commad ca be used o recover daa from a specific poi i ime:。

SELECT FROM able_ame AS OF TIMESTAMP TO_TIMESTAMP('yyyy-mm-dd hh24:mi:ss');。

Replace able_ame wih he ame of he able from which daa eeds o be recovered ad replace he imesamp wih he acual imesamp a which he daa was deleed or updaed.。

If he daa was deleed a log ime ago or if he flashback feaure is o available, we ca recover he daa from a backup. The followig SQL commad ca be used o recover daa from a backup:。

ISERT ITO able_ame SELECT FROM able_ame_backup WHERE imesamp = (SELECT MAX(imesamp) FROM able_ame_backup);。

Replace able_ame wih he ame of he able from which daa eeds o be recovered ad replace able_ame_backup wih he ame of he backup able. This commad will iser he mos rece backup of he able io he origial able.。

Coclusio

Daa recovery is a esseial aspec of daabase maageme ad Oracle provides various ools ad echiques o recover daa i case of accideal deleio or corrupio. I his aricle, we explored how o recover able daa usig SQL i Oracle. By followig he seps oulied i his aricle, you ca easily recover able daa i Oracle.。

Tags

Oracle, SQL, Daa Recovery, Table Daa, Backup。