How To Estimate Disk Space Needed for an Export Job in Oracle?

If you just want to know how much disk space for the dump without actually exporting any data, you can use the ESTIMATE_ONLY=y parameter on the expdp command. The following tutorial exercise shows you how a system user wants to see the disk space estimates on a full database export:

>cd \oraclexe\app\oracle\product\10.2.0\server\BIN

>expdp SYSTEM/fyicenter FULL=y ESTIMATE_ONLY=y
Starting "SYSTEM"."SYS_EXPORT_FULL_01":  SYSTEM/**** FULL=y
  ESTIMATE_ONLY=y

Estimate in progress using BLOCKS method...
Processing object DATABASE_EXPORT/SCHEMA/TABLE/TABLE_DATA
.  estimated "FLOWS_020100"."WWV_FLOW_PAGE_PLUGS"      42 MB
.  estimated "FLOWS_020100"."WWV_FLOW_STEP_ITEMS"      27 MB
.  estimated "FLOWS_020100"."WWV_FLOW_STEP_PROCESSING" 16 MB
......
.  estimated "SYSTEM"."SQLPLUS_PRODUCT_PROFILE"         0 KB
.  estimated "TSMSYS"."SRS$"                            0 KB
Total estimation using BLOCKS method: 169.8 MB
Job "SYSTEM"."SYS_EXPORT_FULL_01" successfully completed

Now you know that you need 170 MB disk space to export the entire data base.

Oracle also records the screen output in a log file called export.log at \oraclexe\app\oracle\admin\XE\dpdump.

⇒Loading and Exporting Data in Oracle

⇒⇒Oracle Database Tutorials