If I delete a table and then rollback it, do the index on
the table remains?
What if I drop the table and roll back?Do index on the
table remains?
What if I truncate the table and roll back? Do the index on
the table remains
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Answer Posted / dinesh kumar
DDL COMMANDS HAVE AUTO COMMIT ....
DML COMMANDS DOES NOT HAVE AUTO COMMIT FEATURE...
SO IF WE USE "DELETE" THE STRUCTURE AND THE TABLE INDEX ARE NOT DELETD, BUT THE RECORDS ARE DELETED...
NOW IF WE USE "ROLLBACK" ALL THE RECORDS ARE GETTING BACK...
IF WE USE "DROP" ALL THE RECORDS+INDEX+STRUCTURE DELETED.
NOW WE USE "ROLLBACK" NO USE OF IT. BECAUSE AFTER EXECUTING THIS COMMAND SQL ENGINE PERFORMS "COMMIT" OPERATION.
IF WE USE "TRUNCATE" ALL THE RECORDS ARE ONLY DELETED . NOT THE STRUCTURE AND INDEX .. THIS IS ALSO DDL SO SQL ENGINE PERFORMS "COMMIT" OPERATION AFTER EXECUTING THIS COMMAND.
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