Page file concepts and how to define its size ?

Hello Experts ,
Wt is the concept and use of defining page files in standard oracle and SAP installations ? why do we need to define it ?
how much size is defined for page file size and on wt factors does it depend ? and where is it defined ?
Requested to revert to the queries at earliest . Points guaranteed .
If any supportive document is sent for the same , it sahll be appreciated .My Email id is [removed by moderator] .
Thanks and Regards,
Saumya

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/tmp/osb/msg > ls -l
-rw-r--r-- 1 weblogic weblogic 904 Jul 22 12:02 yyy_C0001279792949924_20100722_120229_BU.yyy.CH_ASS_xxx.xml
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-rw-r--r-- 1 weblogic weblogic 858 Jul 22 12:02 yyy_C0001279792950017_20100722_120230_BU.yyy.CH_ASS_xxx.xml
-rw-r--r-- 1 weblogic weblogic 890 Jul 22 12:02 yyy_C0001279792950033_20100722_120230_BU.yyy.CH_ASS_xxx.xml
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-rw-r--r-- 1 weblogic weblogic 963 Jul 22 12:02 yyy_C0001279792950158_20100722_120230_BU.yyy.CH_ASS_xxx.xml
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####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '4' ... <BEA1-07857BB52A53B9043886> <> <1279794804450> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792949955_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '0' ... <BEA1-078F7BB52A53B9043886> <> <1279794804454> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792949924_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '1' ... <BEA1-07907BB52A53B9043886> <> <1279794804457> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792949986_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '0' ... <BEA1-07917BB52A53B9043886> <> <1279794804462> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950064_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '1' ... <BEA1-07927BB52A53B9043886> <> <1279794804467> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950017_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '0' ... <BEA1-07937BB52A53B9043886> <> <1279794804607> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950142_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '4' ... <BEA1-07947BB52A53B9043886> <> <1279794804611> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950111_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '4' ... <BEA1-07957BB52A53B9043886> <> <1279794804615> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950096_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '4' ... <BEA1-07967BB52A53B9043886> <> <1279794804618> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950033_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 12:33:24 PM CEST> <... ExecuteThread: '1' ... <BEA1-07977BB52A53B9043886> <> <1279794804630> ...########## ready to process filename: .../tmp/osb/msg/yyy_C0001279792950158_20100722_120230_BU.yyy.CH_ASS_xxx.xml
How could I process files sequentially ?
I think using also Read Limit = 1 and Polling Interval = 1 sec doesn't work, because
- if the proxy instance P1 reading file A takes more than 1 sec
- after 1 sec a second proxy instance P2 starts to process file B
- but P2 can completes its processing before P1 ...
What do you suggest to do ?
Thanks in advance
ferp

Hi Anuj,
even trying with
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I see from OSB log file that the files are processed neither by time order nor by alphabetical order:
####<Jul 22, 2010 2:35:56 PM CEST> ... ExecuteThread: '0' ...<BEA1-07F27BB52A53B9043886> <> <1279802156519> .../tmp/osb/msg/yyy_C0001279792949955_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:35:58 PM CEST> ... ExecuteThread: '0' ...<BEA1-07F47BB52A53B9043886> <> <1279802158508> .../tmp/osb/msg/yyy_C0001279792949924_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:00 PM CEST> ... ExecuteThread: '1' ...<BEA1-07F67BB52A53B9043886> <> <1279802160525> .../tmp/osb/msg/yyy_C0001279792949986_20100722_120229_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:02 PM CEST> ... ExecuteThread: '4' ...<BEA1-07F87BB52A53B9043886> <> <1279802162544> .../tmp/osb/msg/yyy_C0001279792950064_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:04 PM CEST> ... ExecuteThread: '0' ...<BEA1-07FA7BB52A53B9043886> <> <1279802164564> .../tmp/osb/msg/yyy_C0001279792950017_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:06 PM CEST> ... ExecuteThread: '1' ...<BEA1-07FC7BB52A53B9043886> <> <1279802166584> .../tmp/osb/msg/yyy_C0001279792950142_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:08 PM CEST> ... ExecuteThread: '0' ...<BEA1-07FE7BB52A53B9043886> <> <1279802168606> .../tmp/osb/msg/yyy_C0001279792950111_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:10 PM CEST> ... ExecuteThread: '4' ...<BEA1-08007BB52A53B9043886> <> <1279802170624> .../tmp/osb/msg/yyy_C0001279792950096_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:12 PM CEST> ... ExecuteThread: '0' ...<BEA1-08027BB52A53B9043886> <> <1279802172644> .../tmp/osb/msg/yyy_C0001279792950033_20100722_120230_BU.yyy.CH_ASS_xxx.xml
####<Jul 22, 2010 2:36:14 PM CEST> ... ExecuteThread: '4' ...<BEA1-08047BB52A53B9043886> <> <1279802174664> .../tmp/osb/msg/yyy_C0001279792950158_20100722_120230_BU.yyy.CH_ASS_xxx.xml
As said I think that using Read Limit = 1 and Polling Interval = 1 sec doesn't work, because
- if the proxy instance P1 reading file A takes more than 1 sec for processing the file
- after 1 sec a second proxy instance P2 starts to process file B
- but P2 can completes its processing before P1 ...
Do you know if OSB when polling a file, takes it only when OSB recognizes the file has been written completely ?
I mean what happens if OSB wakes up while the file producer is still writing the file ?
Regards
ferp

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