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Oracle 10g AdministrationOracle Shared Server
Copyright ©2006, Custom Training Institute.
Copyright ©2006, Custom Training Institute.
Oracle Shared Server
Previously known as Multi-Threaded Server (MTS).
Now “default” behavior.
Dynamically configured after initial setup.
Copyright ©2006, Custom Training Institute.
Overview of Oracle Shared Server
Clients send requests.
Dispatcher processes on server receive requests.
Dispatcher activates process from shared server pool to satisfy client request.
Dispatcher returns to service another client request.
Copyright ©2006, Custom Training Institute.
Benefits of Oracle Shared Server
Small number of processes; large number of users.
Reduces amount of memory.
Optimizes processor workload.
Copyright ©2006, Custom Training Institute.
Determining Appropriate Usage of Oracle Shared Server
Greatest benefit:Many users initiating connections
Users frequently interrupting activity
Copyright ©2006, Custom Training Institute.
Configuring Oracle Shared Servers
Use SHARED_SERVERS parameter:Set to a value greater than zero
Indicates number of processes to be started in shared server pool
Parameter may be dynamically altered through ALTER SYSTEM.
Copyright ©2006, Custom Training Institute.
Oracle’s Self-Tuning of Shared Servers
Approximately one shared server process for every 10 client connections.
OLTP applications may cause there to be more than 10 client connections per shared server process
Copyright ©2006, Custom Training Institute.
Oracle’s Self-Tuning of Shared Server Usage
SHARED_SERVERS parameter indicates both initial and minimum number of shared server processes.
Can help smooth out dynamically-changing workloads.
Copyright ©2006, Custom Training Institute.
Configuration Parameters for Oracle Shared Server
SHARED_SERVERS
MAX_SHARED_SERVERS
DISPATCHERS
MAX_DISPATCHERS
CIRCUITS
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Obsoleted MTS Parameters
MTS_SERVERS
MTS_MAX_SERVERS
MTS_DISPATCHERS
MTS_MAX_DISPATCHERS
MTS_CIRCUITS
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DISPATCHERS Parameter
One, and only one, of the following attributes is REQUIRED:
PROTOCOL
ADDRESS
DESCRIPTION
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MAX_DISPATCHERS Parameter
Specifies the total number of dispatchers you want to start.
Dispatcher processes accept connections from clients and funnel those connections to available shared server processes.
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MAX_SHARED_SERVERS
Upper bound on total number of shared server processes that PMON can create, based upon the peak load of the system.
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Shared Server Views
V$DISPATCHER_CONFIGInformation on existing dispatchers
Information on dispatcher configurations
V$SHARED_SERVER_MONITOR
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V$DISPATCHER_CONFIG
CONF_INDXNETWORKDISPATCHERSCONNECTIONSSESSIONSPOOL
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V$DISPATCHER_CONFIG
TICKS
MULTIPLEX
LISTENER
SERVICE
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Monitoring Shared Servers
V$SHARED_SERVER_MONITORMAXIMUM_CONNECTIONS
MAXIMUM_SESSIONS
SERVERS_STARTED
SERVERS_TERMINATED
SERVERS_HIGHWATER
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Optimization
Set MAX_SHARED_SERVERS equal to one-tenth the maximum number of connections.
Set SHARED_SERVERS equal to one-tenth the average number of connections.
Copyright ©2006, Custom Training Institute.
Summary
Oracle Shared Server:Architecture
Benefits / Features
Configuration
Tuning
Monitoring
