简介：Oracle Data Pump is a fast and efficient way to import and export data in Oracle databases. EXPDP and IMPDP are the command-line tools used for this purpose. In this article, we explore the key features and differences between EXPDP and IMPDP.
Oracle Data Pump is a fast and efficient data import and export tool for Oracle databases. It provides a streamlined mechanism to move data between Oracle databases, thus simplifying the process of data migration, backup, and recovery. The two main components of Data Pump are EXPDP (Export Data Pump) and IMPDP (Import Data Pump). These tools provide a command-line interface that enables users to perform data export and import operations from the Oracle database server itself. EXPDP and IMPDP offer several advantages over the traditional export and import tools in Oracle, such as exp and imp. Some of the key features of EXPDP and IMPDP include:
Simplified Command Line Interface: EXPDP and IMPDP provide a simplified command line interface that makes it easy to perform data export and import operations.
Parallel Processing: EXPDP and IMPDP support parallel processing, enabling you to simultaneously export or import multiple objects, tables, or directories, improving the overall performance of data transfer operations.
Fine-grained Object Control: EXPDP and IMPDP provide fine-grained object control, allowing you to specify individual objects or sets of objects for export or import.
Network Link Support: EXPDP and IMPDP support network links, enabling you to access remote Oracle databases for data export and import operations.
Compression and Sampling: EXPDP and IMPDP provide support for data compression and sampling, which helps reduce the size of dump files and improve the efficiency of data transfer.
Encryption: EXPDP and IMPDP support encryption for both data and metadata, ensuring the security of sensitive information during data transfer operations.
Now, let’s explore some key differences between EXPDP and IMPDP.
EXPDP vs IMPDP
Purpose: The primary purpose of EXPDP is to export data from an Oracle database, creating a dump file that contains the exported data. On the other hand, IMPDP is used to import data into an Oracle database from an exported dump file.
Usage: EXPDP is typically used when you want to transfer data between different Oracle databases or move data out of an Oracle database. On the other hand, IMPDP is used when you want to import data into an Oracle database from an exported dump file.
Accessibility: EXPDP is a server-side tool that runs on the Oracle database server. It can be accessed using the command line interface on the server itself. IMPDP is also a server-side tool, but it can be run from any location where the Oracle client software is installed.
Parallel Processing: EXPDP supports parallel processing for export operations, allowing you to simultaneously export multiple objects or tables. IMPDP also supports parallel processing for import operations.
Directory Object: EXPDP uses a directory object in the Oracle database to specify the dump file location. The directory object must be created in advance in the database. IMPDP also uses a directory object, but it can also use a local file path as an alternative.
Network Link Support: EXPDP supports network links for accessing remote Oracle databases during export operations. IMPDP also supports network links for importing data from remote Oracle databases.
In conclusion, EXPDP and IMPDP are powerful tools in the Oracle Data Pump arsenal that simplify data transfer operations between Oracle databases. They offer several advantages over traditional export and import tools, including simplified command line interface, parallel processing, fine-grained object control, network link support, compression, sampling, and encryption. It’s important to understand the differences between these tools so you can choose the appropriate one based on your specific requirements.