Help needed for making a copy of a table .

Question

Hi ,
I have a table , which is consisting for nearly 20 columns .
I want to make a Copy of that table with data or without data anything will be fine .
Please tell me how can i make that ??
Is there any option available for that ??
Thank you .

Answer 1

CREATE TABLE MY_COPY AS SELECT * FROM ORIG_TABLE WHERE 1=2;will create a copy of ORIG_TABLE without rows,indexes,constraints.
CREATE TABLE MY_COPY AS SELECT * FROM ORIG_TABLE ;will create a copy of ORIG_TABLE with rows but without indexes and constraints. This would be acceptable if the table is small. Else, create an empty table (as above) and then use
ALTER TABLE MY_COPY NOLOGGING;
INSERT /*+ APPEND */ INTO MY_COPY SELECT * FROM ORIG_TABLE ;(Optionally, add PARALLEL Hints to the INSERT and SELECT.
You can use Export and Import utilities to create a copy of table with options to include or exclude rows, constraints, indexes.
Hemant K Chitale
http://hemantoracledba.blogspot.com