Excessive REPLICAT LAG Times

Hi,
I have a very excessive replicat lag time in the target db,and the repoa lag time is growing...
GGSCI > info all
Program Status Group Lag Time Since Chkpt
MANAGER RUNNING
REPLICAT RUNNING REPOA 34:35:33 00:45:30
REPLICAT RUNNING REPOB 00:00:00 00:00:09
In the source:
GGSCI > info all
Program Status Group Lag Time Since Chkpt
MANAGER RUNNING
EXTRACT RUNNING DPEOA 00:00:00 00:00:08
EXTRACT RUNNING DPEOB 00:00:00 00:00:07
EXTRACT RUNNING EXTOA 00:00:00 00:00:02
EXTRACT RUNNING EXTOB 00:00:00 00:00:00
The replicat repoa's parameter :
replicat repoa
SETENV (ORACLE_SID = "xzjbtjcx")
SETENV (ORACLE_HOME = "/oracle/app/oracle/product/10.2.0")
SETENV (NLS_LANG = "AMERICAN_AMERICA.ZHS16GBK")
userid ogg,password ogg
reportcount every 30 minutes,rate
reperror default,abend
transactiontimeout 5 s
assumetargetdefs
discardfile /oradata/ogg/dirrpt/repoa.dsc,append,megabytes 5000
gettruncates
allownoopupdates
DDL INCLUDE MAPPED
DDLOPTIONS REPORT
DDLERROR DEFAULT IGNORE RETRYOP
SQLEXEC "ALTER SESSION SET COMMIT_WRITE = NOWAIT"
BATCHSQL
map JSSIMIS_XZ.*, target JSSIMIS_XZ.*;
Please help me,how to overcome the replicat lag.
Thanks.
Edited by: user7418832 on 2012-2-21 下午7:18

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Dear Friends,
I want to on and off my heaters only when some X condition is fulfill. Once the conditions is TRUE only that time lag time should be executed and then it shoud run normally. when condition X get FALSE, and then again TRUE ...again lag time will be execute...I am attaching a simple plot.. which can helps you for better understading of my problem.
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Attachments:
LagTime.GIF ‏6 KB

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