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Copy Oracle tables between database schemas

Oracle Database Tips by Donald BurlesonJune 5, 2013

 

Question:  I need to copy a set of tables (along with their indexes and constraints) from one schema to another schema.  The schemas are on different databases so perhaps by question is best posed as "how do I copy tables between databases?"  I know that there are several methods for copying schema tables, but I wanted to know the best practices for moving tables between database schemas.  Thank you.

 

 

Answer:  Yes, you are correct there are several methods for copying tables between schemas, some direct and some indirect.  If the schemas are within the same database the "create table as select" is a simple way to copy a table from one schema to another.  Below we copy a table between the smith and jones schemas:

create table
   jones.fred1
as
   select * from smith.fred1;


Also see:
  • Use CTAS to copy the tables, and then punch & re-add constraints and indexes using dbms_metadata. Parallelized CTAS is a faster way to copy a table.
  • Use the SQL*Plus copy command

When the schemas are within different databases then we have two approaches to copying table between schemas:

     - Direct table copying:  This requires the use of a database link.

     - Indirect data copying:  This requires using the database pump utility, a three-step
       copy  process.  This has the advantage because you can also copy the table indexes and
       constraints between the schemas:

a) use expdp to export the table(s)
b) Use FTP to move the export file to the new database server
c) Use impdp to import the tables into the new database schema

   
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