Oracle imp command introduction

imp is a command line tool in Oracle database, used to import exported data and objects from one database instance to another database instance. The general syntax of the imp command is "imp username/password@connect_string file=file_name [options]".

imp is a command line tool in Oracle database that is used to import exported data and objects from one database instance to another database instance.

The following is the general syntax of the imp command:

imp username/password@connect_string file=file_name [options]

The meaning of each parameter is as follows:

• username/password@connect_string: Specify the database instance to be connected username, password, and connection string. For example, scott/tiger@localhost:1521/orcl.
• file=file_name: Specify the file name of the imported data. It can be an exported .dmp file or .exp file.
• options: Optional parameters used to specify imported options and settings.

Commonly used imp command options include:

• full=y: Import all objects and data.
• fromuser=source_user: Specify the source user for exporting data.
• touser=target_user: Specify the target user for imported data.
• tables=table_list: Specify the table name or list of table names to be imported.
• indexes=y: Import indexes.
• constraints=y: Import constraints.
• ignore=y: Ignore errors during import.
• ignore=y: Ignore errors during import.

The following is an example:

imp scott/tiger@localhost:1521/orcl file=expdat.dmp full=y

The above command will import all objects and data from the expdat.dmp file to the database instance under the scott user.

It should be noted that the imp command is obsolete in Oracle 10g and above versions. It is recommended to use the impdp command for data import and export operations.

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