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.

chapter 12 loading and transporting data

Documents

binary file

interactive export

exported data

dump files

loader utilityimports

import utilities

structure of database

types of files