Chapter 12 Loading and Transporting Data

Chapter 12 Oracle9i DBA II: Backup/Recovery and Network Administration

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Chapter 12Loading and Transporting Data


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Chapter Objectives

• Identify the purpose of the Export, Import, and SQL*Loader utilities

• Perform an interactive export of a table

• Perform a scripted export of a table


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Chapter Objectives (Cont.)

• Perform an interactive import of an Oracle9i table

• Perform a scripted import of an Oracle9i table

• Load external data into an Oracle9i database


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Export Utility

• Use to:– Create logical backup

Copy contents and structure of database, schema, or tablespace

– Reorganize databaseReduces fragmentation

• Creates a binary dump file for importing

• Compresses extents by default


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Export Types

• Conventional-path– Verifies DDL statements– Default

• Direct-path– Places retrieved rows in dump files, followed

by DDL statements– Specified with DIRECT=Y argument– Saves time for large amounts of data


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Export Utility Help


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Export Utility Interactive


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Parameter File for Scripted Export


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Executing Scripted Export


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Import Utility

• Reads (and executes) DDL statements in exported binary dump file

• Recreates tables if necessary

• Can be interactive or scripted

• Access by typing imp operating system prompt


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Interactive Import


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Parameter File for Scripted Import


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Scripted Import


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Backup and Recovery of the Recovery Catalog

• Export (or import) entire RMAN schema

• Logical backup supplements physical backup strategy

• Example RMAN schema export command:exp rman/rman@database_name

file=dumpfilename.dmp owner=rman


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SQL*Loader Utility

• Imports data generated by a different type of database (non-Oracle)

• Uses three types of files:– Control file– Input file– Log files (bad, discard, general)


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Control File

Specifies data to be loaded, format, and procedure


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Input File Example


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General Log File Example


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Loading Methods

• Conventional-pathUses INSERT statements, fires triggers

• Direct-pathBypasses the buffer cache, writes directly to data file

• Parallel direct-pathUses multiple load sessions; requires more space


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SQL*Loader Utility


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Chapter Summary

• The Export utility is used to export data from an existing Oracle9i database table

• The entire database, a user’s schema, or simple a database table can be exported using the Export utility.

• Exported data is written to a binary file, known as a dump file.


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Chapter Summary (Cont.)

• The Export utility can be operated in an interactive or scripted mode.

• If a value is not specified, the Export utility assumes the default value for the parameter.

• The Import utility is used to import data that was previously exported to a dump file.


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• The Export and Import utilities can be used along with a physical backup strategy to create a backup of the Recovery Catalog.

• The SQL*Loader utility is used to load data from text files.

• SQL*Loader utilizes three types of files: a control file, log files, and input file.


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• The control file specifies the loading parameters and the structure of the data.

• The log files are used to provide information about the loading process and identify any bad or discarded records.

• The input file contains records to be loaded into the database; otherwise the data must be contained in the control file.

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Chapter 12 Loading and Transporting Data