Question
What is TRUNCATE table ?
Answers
TRUNCATE table is a DDL command used to remove all the rows from the specified table or cluster instantly. Eg: TRUNCATE TABLE table_name;
Advantage over DELETING:
a] It is a DDL statement and generates NO ROLLBACK information.
b] Doesn’t fire the tables DELETE TRIGGER.
c] Truncating the master table of a snapshot doesn’t record any changes in the tables snapshot log.
d] It’s more convenient than dropping and recreating the table.
e] D/R invalidates the table’s dependent objects than truncating the object.
f] D/R requires you to REGRANT the privileges on the table while truncating doesn’t.
g] D/R requires you to RECREATE the INDEXES, INTEGRITY CONSTRAINTS,TRIGGERS and STORAGE PARAMETER while truncating doesn’t.   Your Comment




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