You can start, stop, or pause a service at any time.
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Starting a service makes it available for client access. When you start a
service, the server instantiates the minimum number of instances you specified.
As clients request the service, the server returns an available instance. If
none are currently available, the server instantiates more instances to meet
demand until the maximum number of instances is reached. At this point, any new
clients that make a request for the service will be placed in a queue for the
next available instance. Pooled services will continue to run with the maximum
number of instances until recycling happens. Non-pooled services, however, will
return to the minimum number of instances as client requests diminish.
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When you stop a service, the server immediately removes all instances of that
service from the server. This frees up any machine resources that were
dedicated to the service. Clients that were using the service may fail to work
properly because the service is no longer available.
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When you pause a service, the server refuses any new client requests for the
service. However, existing clients can complete their use of the service.
Pausing a service doesn't remove instances from the server. You might pause a
service if a data source required by the service is not available. For example,
if your map services reference an ArcSDE server containing a geodatabase, and
that ArcSDE server is down for maintenance, you might pause the map service
until the database is available again. Because the instances of the service are
not removed when you pause it, it's much quicker to start a paused service than
one that is stopped.
How to stop, start, or pause a service using Manager
In Manager, click the Services tab to display a list of services as well as the
Start, Stop, and Pause commands. When you click one of these commands, it will
apply to all of the services in the list whose boxes are checked.
How to start, stop, or pause a service using ArcCatalog
In ArcCatalog, right-click a service to reveal the context menu for starting,
stopping, and pausing the service. Alternatively, you can display the ArcGIS
Service Administration toolbar that contains these same operations.