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Oracle10g Grid Computing with RAC
Chapter 17 -
Oracle’s Grid Integration Technologies

Data Pump Export

ESTIMATE – This specifies whether or not export should estimate how much disk space the export job consumes in bytes.  The estimated size is displayed in the log file and on the client’s output screen.  The estimate is only for table row data; it does not include metadata.

Valid values for this parameter are:

  • BLOCKS – The estimate is calculated by multiplying the number of database blocks used by the target objects by the appropriate block size.  This is the default value.

  • SAMPLING – The estimate is calculated by sampling a fixed number of rows per table.

  • STATISTICS – The estimate is calculated by using each table’s statistics from the most recent analysis.

  • When estimate_only=y, the export estimates the space that would be consumed, but no data is actually exported.  The default value is N. Here is an example of an export using estimate_only=y:

$ expdp oracle/passwd estimate_only=y
Export: Release - 64bit Beta on Sun Sep 21 18:00:59 2003
(c) Copyright 2002 Oracle Corporation. All rights reserved.
Connected to: Oracle10i Enterprise Edition Release - 64bit Beta
With the Partitioning, OLAP and Oracle Data Mining options
Starting "ORACLE"."SYS_ESTIMATE_SCHEMA_01":   estimate_only=y
Estimate in progress using BLOCKS method...
.  estimated "ORACLE"."PLAN_TABLE"                      64 KB
.  estimated "ORACLE"."TEST"                            64 KB
Total estimation using BLOCKS method: 128 KB
Job "ORACLE"."SYS_ESTIMATE_SCHEMA_01" successfully completed

exclude – This allows fine-grained specification of objects and object types that are to be excluded from the export operation  (default value is NONE).  The excludeand include parameters are mutually exclusive.

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