OracleCommand command, ExecuteNonQuery issue

Question

I have to clear certain tables in the oracle database however when I\'m having issues with running the following code

public static void ClearDataTables(ILis         


        

Answer 1

Have you forgotten to commit your changes in Toad (or any other client)? An open transaction will cause it to wait indefinitely.

Answer 2

I would probably write a stored procedure that does all of the deletions or truncations and invoke the SP once, rather than have a loop client-side.

EDIT: It would also be better not to create the command object inside the loop. Create it once outside the loop with a table-name parameter, and then invoke it feeding it a different parameter value with each iteration. But the SP is to be preferred.

Answer 3

Is there a lot of data in that table? This would explain, why it takes so long to delete the data.
Anyway, I suggest to use TRUNC for clearing tables.

Answer 4

Large number of deletes can be very slow, especially if you run them in one transaction. If you don't need the transaction at all, use:

truncate table YourTable

If you do, split the delete over small-sized transactions. Basically run:

delete from YourTable where rownum < 100

until the table is empty. See for example this blog post.