How to Take Compressed Export using expdp

Compressed database export using expdp

Use COMPRESSION parameter of expdp to perform compressed export
Default: METADATA_ONLY
Syntax and DescriptionCOMPRESSION=[ALL | DATA_ONLY | METADATA_ONLY | NONE]
ALL enables compression for the entire export operation.
DATA_ONLY only data being written to the dump file is compressed.
Note: Both The ALL amd DATA_ONLY options requires that the Oracle Advanced Compression option be enabled.

While taking compressed export you can even define the algorithm to be used for compression using COMPRESSION_ALGORITHM parameter if not explicitly defined default: BASIC is used
Default: BASIC
Syntax and DescriptionCOMPRESSION_ALGORITHM = {BASIC | LOW | MEDIUM | HIGH}
Note: to use COMPRESSION_ALGORITHM database compatibility should be 12.0.0 or higher and Oracle Advanced Compression option should be enabled.

Example

$ cat exp_full_pdb01.par
directory=dump
dumpfile=EXP_PDB01_FULL%U.dmp
logfile=EXP_PDB01_FULL.log
full=y
COMPRESSION=ALL

$ expdp system@PDB01 parfile=exp_full_pdb01.par

Export: Release 12.2.0.1.0 - Production on Thu Oct 11 12:05:13 2018

Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production

Starting "SYSTEM"."SYS_EXPORT_FULL_02": system/********@PDB01 parfile=exp_full_pdb01.par

............................................................................................................................................

How to Check if the Compression is used and what algorithm

SQL> select utlname, COMPRESSCNT, COMPRESSBAS, COMPRESSLOW, COMPRESSMED, COMPRESSHGH from ku_utluse where utlname ='Oracle Utility Datapump (Export)';

Of course you can check the size of dumpfile to determine the amount of space you saved using compression

$ du -sk EXP_PDB01_FULL01.dmp
868 EXP_PDB01_FULL01.dmp

Let us change the parameter file for expdp to use the compression_algorithm HIGH

$ cat exp_full_pdb01.par
directory=dump
dumpfile=EXP_PDB01_FULL%U.dmp
logfile=EXP_PDB01_FULL.log
full=y
COMPRESSION=ALL

COMPRESSION_ALGORITHM=HIGH

$ expdp system@PDB01 parfile=exp_full_pdb01.par

Export: Release 12.2.0.1.0 - Production on Thu Oct 11 13:43:39 2018

Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
Starting "SYSTEM"."SYS_EXPORT_FULL_02": system/********@PDB01 parfile=exp_full_pdb01.par

............................................................................................................................................

$ du -sk EXP_PDB01_FULL01.dmp
556 EXP_PDB01_FULL01.dmp

NOTE:- If you use compression yes will save space on the disk to store the dump file however keep in mind that compression is a recourse intensive operation and therefore you will have to compromise with performance overhead

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