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The RTR System Management Environment
Monitoring RTR
RTR Monitor pictures or the RTR Monitor let you view the
status and activities of RTR and your applications. A monitor
picture is dynamic, its data periodically updated. RTR SHOW
commands that also let you view status are snapshots, giving
you a view at one moment in time. A full list of RTR Monitor
pictures is available in the RTR System Manager’s Manual ‘‘RTR
Monitoring’’ chapter and in the help file under RTR_Monitoring.
Many RTR Monitor pictures are available using the RTR browser
interface.
Transaction
Management
The RTR transaction is the heart of an RTR application,
and transaction state characterizes the current condition of a
transaction. As a transaction passes from one state to another, it
undergoes a state transition. Transaction states are maintained
in memory, and some are stored in the RTR journal for use in
recovery.
RTR uses three transaction states to track transaction status:
• transaction runtime state
• transaction journal state
• transaction server state
Transaction runtime state describes how a transaction progresses
from the point of view of RTR roles (FE, TR, BE). A transaction,
for example, can be in one state as seen from the frontend, and
in another as seen from the router.
Transaction journal state describes how a transaction progresses
from the point of view of the RTR journal. The transaction
journal state, not seen by frontends and routers, managed by
the backend, is used by RTR for recovery replay of a transaction
after a failure.
Transaction server state, also managed by the backend, describes
how a transaction progresses from the point of view of the
server. RTR uses this state to determine if a server is available
to process a new transaction, or if a server has voted on a
particular transaction.
The RTR SHOW TRANSACTION command shows transaction
status, and the RTR SET TRANSACTION command can be
used, under certain well-constrained circumstances, to change
the state of a live transaction. For more details on use of SHOW
and SET commands, see the RTR System Manager’s Manual.
5–4 The RTR Environment