DBAII_R1_1_Les18_E

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Transporting Data Between Databases : 

Transporting Data Between Databases

Objectives : 

Objectives After completing this lesson, you should be able to do the following: Describe the uses of the Export and Import utilities Describe Export and Import concepts and structures Perform simple Export and Import operations List guidelines for using Export and Import

Oracle Export and Import Utilities : 

Oracle Export and Import Utilities Export Import

Oracle Export and Import Utility Overview : 

Oracle Export and Import Utility Overview You can use these utilities to do the following: Archive historical data Save table definitions to protect them from user error failure Move data between machines and databases or between different versions of the Oracle server Transport tablespaces between databases

Methods of Invoking the Export and Import Utilities : 

Methods of Invoking the Export and Import Utilities Command-line interface An interactive dialog Parameter files Oracle Enterprise Manager

Export Modes : 

Full Database Mode Tables definitions Tables data Grants Indexes Tables constraints Export Modes Table Mode Table definitions Table data (all or selected rows) Owner’s table grants Owner’s table indexes Table constraints User Mode Tables definitions Tables data Owner’s grants Owner’s indexes Tables constraints Tablespace Mode Table definitions Grants Indexes Table constraints Triggers

Invoking Export : 

Invoking Export Syntax: Examples: exp hr/hr TABLES=employees,departments rows=y file=exp1.dmp exp keyword = value, value2, … ,valuen exp system/manager OWNER=hr direct=y file=expdat.dmp exp \'username/password AS SYSDBA\' TRANSPORT_TABLESPACE=y TABLESPACES=ts_emp log=ts_emp.log

Using the Export Wizard : 

Using the Export Wizard

Direct-Path Export Concepts : 

Direct-Path Export Concepts Buffercache Generate SQLcommands Write blocks Direct Path Dump file Export Export Oracle Server Read blocks Evaluatingbuffer TTCbuffer Buffercachemanager SQLcommandprocessing Two-Taskcommon(TTC) Direct Path Conventional Path

Direct-Path Export Features : 

Direct-Path Export Features The type of Export is indicated on the screen output, export dump file, and the log file. Data is already in the format that Export expects, avoiding unnecessary data conversion. Uses an optimized SQL SELECT statement.

Direct-Path Export Restrictions : 

Direct-Path Export Restrictions The direct-path option cannot be invoked interactively. Client-side and server-side character sets must be the same. The BUFFER parameter has no affect. You cannot use the direct-path option to export rows containing LOB, BFILE, REF, or object types.

Specifying Direct-Path Export : 

Specifying Direct-Path Export As command line argument to the Export command: As a keyword in a parameter file: exp parfile=<Parameter file> exp userid=hr/hr full=y direct=y

Uses of the Import Utility for Recovery : 

Uses of the Import Utility for Recovery Create table definitions Extract data from a valid Export file Import from a complete or cumulative Export file Recover from user-error failures

Import Modes : 

Import Modes Mode Description Table Import specified tables into a schema. User Import all objects that belong to a schema Tablespace Import all definitions of the objects contained in the tablespace Full Database Import all objects from the export file

Invoking Import : 

Invoking Import Syntax: Examples: imp hr/hr TABLES=employees,departments rows=y file=exp1.dmp imp keyword = value or keyword = value, value2, … value n imp system/manager FROMUSER=hr file=exp2.dmp imp \'username/password AS SYSDBA\' TRANSPORT_TABLESPACE=y TABLESPACES=ts_employees

Using the Import Wizard : 

Using the Import Wizard

Invoking Import as SYSDBA : 

Invoking Import as SYSDBA You need to invoke Import as SYSDBA under the following conditions: At the request of Oracle technical support When importing a transportable tablespace set To invoke Import as SYSDBA: imp \'username/password AS SYSDBA\'

Import Process Sequence : 

Import Process Sequence 1. New tables are created 2. Data is imported 3. Indexes are built 4. Triggers are imported 5. Integrity constraints are enabled on the new tables 6. Any bitmap, functional, and/or domain indexes are built

Globalization Support Considerations : 

Globalization Support Considerations The Export file identifies the character encoding scheme used for the character data in the file. The Import utility translates data to the character set of its host system. A multibyte character set Export file must be imported into a system that has the same characteristics.

Summary : 

Summary In this lesson, you should have learned how to: Describe the uses of Export and Import Describe Export and Import concepts and structures Perform simple Export and Import operations List guidelines for using Export and Import

Practice 18 Overview : 

Practice 18 Overview This practice covers the following topics: Using the Export utility Using the Import utility

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