April 1999
Intermediate to advanced
584 pages
23h 17m
English
Content preview from Oracle Database Administration: The Essential RefeBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Other uses for Export
Because the Export utility provides a logical backup of the database, it can be used to move data in and out of the database. As a DBA, you can use Export/Import as follows:
To move data between operating systems or versions of Oracle. If you do move data between computer systems, use a binary mode file copy rather than a record-based copy (see Chapter 16 for details).
To assist in changing some of the storage attributes of a table. Once you have exported a table, you can drop it, recreate it with different storage parameters, or even place it in a new tablespace and then reimport the table. If you are doing this, make sure that you specify IGNORE=Y in the Import control file.
To change the owner of the table. Any export file written by a non-DBA user can be imported by any other user. The userid specified when invoking Import will become the owner of the objects. If the export was performed by a DBA, then the import can only be performed by a DBA, but the FROM-OWNER and TOOWNER clauses can be used to change the owner of the objects.
The Export/Import facility is not the only way to accomplish these tasks; you can use a series of SQL statements and SQL*Net to perform all of these actions. However, in many cases, using Export/Import is easiest, and requires less storage within the database.
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