Oracle Data Pump is a powerful utility tool that allows you to export and import data and metadata between Oracle databases.
1. Exporting data with Oracle Data Pump
To export data, you start by creating an export job using the ‘expdp‘ command. This command requires several parameters to be specified, such as the Oracle database schema to be exported, the directory object that identifies where the data pump files will be written, and the full path file name to which the dump file set will be written. Here is an example command line:
expdp schema_name DIRECTORY=data_pump_dir DUMPFILE=schema_name_exp.dmpThis command exports the entire schema named ‘schema_name‘ and writes the dump file to the directory object ‘data_pump_dir‘ with the file name ‘schema_name_exp.dmp‘. The ‘expdp‘ command also allows you to specify numerous other parameters, such as table filtering options, network link encryption, and compression options.
2. Importing data with Oracle Data Pump
After you have created an export job and generated a dump file set, you can import the data into a new or existing database schema using the ‘impdp‘ command. This command requires several parameters to be specified as well, such as the Oracle database schema to be imported into, the directory object that identifies where the dump file set is located, and full path file name from which the dump file set is read. Here is an example command line:
impdp schema_name DIRECTORY=data_pump_dir DUMPFILE=schema_name_exp.dmpThis command imports the entire schema named ‘schema_name‘ and retrieves the dump file from the directory object ‘data_pump_dir‘ with the file name ‘schema_name_exp.dmp‘. The ‘impdp‘ command also allows you to specify numerous other parameters such as tablespace mapping options, object remapping options, and network link encryption options.
3. Benefits of using Oracle Data Pump
Oracle Data Pump offers several advantages over traditional Oracle Export and Import utilities. One of the key advantages is the ability to specify the name of the destination tablespace while importing data - this allows different tablespaces to be used for different modules of the application, making it easier to manage data files and locate data files for specific objects. Additionally, Oracle Data Pump is much more efficient when it comes to exporting and importing large data sets. This is mainly due to the use of parallelism which allows Data Pump to use multiple worker processes to improve the speed of the transfer.
Overall, Oracle Data Pump is an essential tool for any Oracle database administrator as it makes exporting and importing Oracle Data between databases much easier and more efficient.