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onstat -g ath
onstat -g ath
The onstat -g ath command prints information about all threads.
The following table summarizes the threads that Enterprise Replication uses.
You can use this information about threads when you evaluate memory use.
For more information, see the utilities chapter of the IBM Informix Administrator’s Reference.
Number of
Threads
Thread Name
Thread Description
1
ddr_snoopy
Performs physical I/O from logical log, verifies potential replication, and
sends applicable log-record entries to Enterprise Replication
1
preDDR
Runs during queue recovery to monitor the log and sets blockout mode
if the log position advances too far before replication resumes
1
CDRGfan
Receives log entries and passes entries to evaluator thread
n
CDRGevaln
Evaluates log entry to determine if it should be replicated (n is the
number of evaluator threads specified by CDR_EVALTHREADS)
This thread also performs transaction compression on the receipt of
COMMIT WORK and queues completed replication messages.
1 per large
transaction
CDRPager
Performs the physical IO for the temporary smart large object that holds
paged transaction records
Grouper paging is activated for a transaction when its size is 10 percent
of the value of SHMVIRTSIZE or CDR_QUEUEMEM or when it includes
more than 100,000 records.
1
CDRCparse
Parses all SQL statements for replicate definitions
1 per
connection
CDRNsTn
Sending thread for site
1 per
connection
CDRNrn
Receiving thread for site
2...n
CDRACK_n
Accepts acknowledgments from site
CDRNsAn
At least 2, up to a maximum of the number of active connections
(1 of 2)
onstat Command Reference C-3