Re: Schemas and Search Path

Pavel Stehule <pavel.stehule@xxxxxxxxx> · Mon, 20 Mar 2023 17:14:32 +0100

Hi

po 20. 3. 2023 v 17:08 odesílatel DAVID ROTH <adaptron@xxxxxxxxxxx> napsal:

   Is there any practical limit on the number of schemas in a database?

   Will the number of schemas in a user's search path impact performance?

Sure, it should have an impact. When you use an unqualified identifier, then the identifier is searched sequentially in schemas in the search path. With a large number of schemas in the search path, the planning time can be higher (and memory usage for cache of system objects can be higher too).

Regards

Pavel

   Thanks

   Dave Roth

    On 03/20/2023 10:15 AM Ron Johnson <ronljohnsonjr@xxxxxxxxx> wrote:

    Real-time CDC is the difficult part.  ora2pg (using views) can do a static migration.  No coding (unless you consider clever use of bash to modify config files to be coding).  I used it to migrate a 7TB db to Postgresql.

     https://ora2pg.darold.net/

     On Mon, Mar 20, 2023 at 8:58 AM Inzamam Shafiq <inzamam.shafiq@xxxxxxxxxxx> wrote:

        Hi,

        Hope everyone is fine.

        Can someone help or guide regarding Open Source tools for Oracle to PostgreSQL migration with real time CDC. along with this is there any possibility to change the structure of the database? Let me explain a little more,

        We have an Oracle DB which is around 1TB and we want to migrate to PostgreSQL that have a new table structure, so we want to perform data transformation and real time CDC from Oracle to PostgreSQL. Do we have any good open source tool to achieve this with No Coding involved.??

        Thanks.

           Regards,

            Inzamam Shafiq

            Sr. DBA