Reader Server:

The following is the output:

FROM_STREAMS_APPLY_READER
------------------------------------------------------------
Session SID           : 27
APPLY Name            : LN1_APPLY
Current State         : DEQUEUE MESSAGES
TOT MSGs Dequed       : 30069
Time last msg received: 2004-10-18 17:12
Last DeQued MSG  NUM  : 13335488
CRT-Time at SRCDB of Last MSG : 2004-10-18 17:12
SGA Used so far       : 800
Last browse SCN       : 0
Oldest SCN            : 13335488

With the help of the above information, the DBA can keep track of the messages and the transaction load for the Apply process.

Coordinator Process:

The coordinator process is an Oracle background process.  It gets the transactions from the reader server and passes them to Apply servers. The coordinator process name is Annn, where nnn is a coordinator process number.