Hello again friends! This week we are going to see how to make an expdp / impdp through the creating a network link . With this, we will reduce the space we need as well as the time to do it. It is one of the Oracle best practices , so what, let’s see it !!
First, we have 2 ways to do it. Both are totally valid:
- Expdp: From origin we send to destination
- Impdp: From destination we read and write.
In both cases, we will need to carry out a previous configuration that we must adapt to the requirements of our environment.
Configuration required to create a Network Link
In order to carry out our expdp / impdp we need to have the structure created:
- Entry into the tnsnames.ora from the source / destination machine
- Create directory to store the logfile and give the pertinent permits.
- Create dblink
We start from the following scenario:
- Machine 1: oraclehost1.domain.com
- SID = ORACL1
- Machine 2: oraclehost2.domain.com
- SID = ORACL2
1- tnsnames.ora entry.
If we launch impdp , we add this entry in the file tnsnames.ora ORACL2 machine
ORACL1 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = oraclehost1.domain.es) (PORT = 1533))) (CONNECT_DATA = (SERVICE_NAME = ORACL1)))
ORACL2 = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (HOST = oraclehost2.domain.es) (PORT = 1533))) (CONNECT_DATA = (SERVICE_NAME = ORACL2)))
2- Create the folder that will contain the log.
We must modify the clause USING specifying the Dblink to use:
CREATE DATABASE LINK "SYSLINK" CONNECT TO system IDENTIFIED BY oracle123 USING 'ORACL2' /
CREATE DATABASE LINK "SYSLINK"
CONNECT TO system
IDENTIFIED BY oracle123
This step will be required for both runs
CREATE OR REPLACE DIRECTORY expdp_dir AS '/ backup / datapump';
GRANT READ, WRITE ON DIRECTORY expdp_dir TO system;
Execution of expdp / impdp command with network link:
expdp \ '/ as sysdba ' network_link = SYSLINK directory = expdp_dir logfile = 20210317_impdp_user_ APLICAUSER.log schemas = APLICAUSER
impdp \ '/ as sysdba ' network_link = SYSLINK directory = expdp_dir logfile = 20210317_impdp_user_ APLICAUSER.log schemas = APLICAUSER
Then we can see in the following image, it is executed correctly:
Also, if you want us to help you with your environment, whether for administration or consulting tasks, do not hesitate to contact us !! See you next time!!
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You can see more information in this Oracle document: https://www.oracle.com/a/tech/docs/19c-oracle-data-pump-whats-new.pdf