Server User Manual

Recover On Restart (Automatic Recovery)
To set the Recover on Restart attribute with the Admin Console, go to Congurations >
cong-name > Transaction Service. Click the Recover check box to set it to true (checked, the
default) or false (un-checked).
You can also set automatic recovery with asadmin, for example:
asadmin set server1.transaction-service.automatic-recovery=false
When Recover on Restart is true, the server will always perform transaction logging, regardless
of the Disable Distributed Transaction Logging attribute.
If Recover on Restart is false, then:
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If Disable Distributed Transaction Logging is false (the default), then the server will write
transaction logs.
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If Disable Distributed Transaction Logging is true, then the server will not write transaction
logs.
Not writing transaction logs will give approximately twenty percent improvement in
performance, but at the cost of not being able to recover from any interrupted transactions.
The performance benet applies to transaction-intensive tests. Gains in real applications
may be less.
Keypoint Interval
The keypoint interval determines how often entries for completed transactions are removed
from the log le. Keypointing prevents a process log from growing indenitely.
Frequent keypointing is detrimental to performance. The default value of the Keypoint Interval
is 2048, which is sucient in most cases.
HTTP Service Settings
Monitoring and tuning the HTTP server instances that handle client requests are important
parts of ensuring peak Enterprise Server performance.
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“Monitoring the HTTP Service” on page 60
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“Tuning the HTTP Service” on page 64
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“Tuning HTTP Listener Settings” on page 69
Monitoring the HTTP Service
Enable monitoring statistics for the HTTP service using either Admin Console or asadmin.In
the Admin Console, the monitoring level (LOW or HIGH) has no eect on monitoring the
HTTP Service.
HTTP Service Settings
Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 200960