Performance for full export database.

Hi,
Is it possibe to estimate or measure how much time needs to export the whole database?
Should I use the parameter "direct=y" to speed up the export process?
Thanks very much.
Frank

Hi,
I tried the export in the database server, but the error is encountered.
Is it because the user(system) is different from owner(ds_ap_dwh)?
Anyone can advise me? thanks alot.
Frank.
C:\>exp system/manager owner=ds_ap_dwh direct=y file=g:\oracle\export\ds_ap_dwh.d
mp log=g:\oracle\export\ds_ap_dwh.log
Export: Release 9.2.0.1.0 - Production on Tue May 29 23:48:36 2007
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to: Oracle9i Release 9.2.0.1.0 - Production
JServer Release 9.2.0.1.0 - Production
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
About to export specified users ...
. exporting pre-schema procedural objects and actions
. exporting foreign function library names for user DS_AP_DWH
. exporting PUBLIC type synonyms
. exporting private type synonyms
. exporting object type definitions for user DS_AP_DWH
About to export DS_AP_DWH's objects ...
. exporting database links
. exporting sequence numbers
. exporting cluster definitions
EXP-00056: ORACLE error 24324 encountered
ORA-24324: service handle not initialized
EXP-00056: ORACLE error 24324 encountered
ORA-24324: service handle not initialized
EXP-00000: Export terminated unsuccessfully

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Technical Details
NLS_LANGUAGE.....................AMERICAN
NLS_TERRITORY.....................AMERICA
NLS_CURRENCY.....................$
NLS_ISO_CURRENCY..............AMERICA
NLS_NUMERIC_CHARACTERS .,
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NLS_DUAL_CURRENCY............ $
NLS_COMP...............................BINARY
NLS_LENGTH_SEMANTICS.......BYTE
NLS_NCHAR_CONV_EXCP........FALSE
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