How to Enhance or Speedup Datapump Schema Refresh

Hi All,
My environment is Oracle 10g Rel2 on RAC (Linux 5), central Storage... We are doing Datapump Schema refresh(Export) with parallel and excluding only grants; parameters. Is there any possibility to enhace the import process by importing metadata and data separately. We tried Parallel option, but still import takes much longer to complete. Is it anything to do with breaking import in two parts. But i dont know how to break the import task.
Kindly reply with appropriate examples..Would appreciate your response.
Thanks,
Abdul Mannan

Hi Hitgon,
Please find the following details:
how many physical cpu/core? - 16 CPU
whether the os is 64bit/32bit? - 64 bit (64 bit Grid Servers)
how many physical memory in os? - 12 Servers with (256 GB) and 4 Servers (64GB)
how many memory assign to db? - SGA - 12GB & PGA - 6GB
what the size of database? more than 1 TB
what the size of schema you are going to import? around 700 - 950 GB
import process running from remote client/server or it's the server import - we are initiating the job on server using (Putty).
Using the following Export and Import Commands:
Datapump Export parfile:
JOB_NAME=Schema1_20120621_100122_27198
DIRECTORY=DPUMP_Export
PARALLEL=4
DUMPFILE=Schema1_20120621_100122_27198_%U.dmp
LOGFILE=DPUMP_EXPORT:DPEXPORT_20120621_100122_27198.log
CONTENT=ALL
FILESIZE=10000M
Datapump Import parfile:
SCHEMAS=Schema1
JOB_NAME=Schema1_20120118_213551
DIRECTORY=DPUMP_EXPORT
PARALLEL=4
DUMPFILE=SCHEMA1_20120114_025007_19273_%U.dmp
LOGFILE=DPUMP_EXPORT:DPIMP_20120118_213551.log
REMAP_TABLESPACE=Schema1DATA:Schema2DATA
EXCLUDE=GRANT
EXCLUDE=STATISTICS
Would appreciate your reply..
Thanks,
Abdul Mannan

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