SQL: delete all the data from all available tables

Question

I am using oracle DB to maintain more than 30 tables, how can I delete all the data from all the tables? I only want to delete the data but not drop the tables.

Answer 1

The potential drawback with a truncate is that it may fail on referential integrity constraints. So you'd want to disable foreign key constraints first, then do the truncate, then re-enable constraints. The 'plus' with cloning the schema (exp and imp) is that you could also drop and recreate the tablespace too (which you may want to do if you want to reclaim some physical disk space as a result of removing all the data).