Sybase 12.5.1, Руководство пользователя

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CHAPTER 1 Introduction
User’s Guide
3
Adaptive Server Enterprise Monitor architecture
Adaptive Server saves performance data in a shared memory area that Monitor
Server reads. Because of this shared memory technique, Monitor Server must
be installed and running on the same machine as the Adaptive Server being
monitored. A one-to-one relationship exists between an Adaptive Server and a
Monitor Server. For more information about Monitor Server, see the Sybase
Adaptive Server Enterprise Monitor Server User’s Guide.
Monitor Client Library applications obtain Adaptive Server performance
statistics from Monitor Server. These applications are clients of Monitor
Server. For performance reasons, Sybase recommends running Monitor Client
Library applications on machines other than the ones where pairs of Adaptive
Server and Monitor Server are running. See the Sybase Adaptive Server
Enterprise Monitor Client Library Programmer’s Guide for more information.
The Adaptive Server Enterprise plug-in for Sybase Central includes a set of
monitors showing different aspects of Adaptive Server resource usage at
various levels of detail. Each open monitor is a separate application, with a
unique client connection to Monitor Server. In Sybase Central, each Adaptive
Server installation has its own Monitors folder containing the set of monitor
objects.
Historical Server collects performance information from Monitor Server and
saves the information in files for deferred analysis. Historical Server interfaces
let users specify the data to collect and the time period desired. They also
include a historical data playback feature. The interfaces are:
• A command interface in
isql
. For more information, see the Sybase
Adaptive Server Enterprise Monitor Historical Server User’s Guide.
• A programming interface using Monitor Client Library. For more
information, see Sybase Adaptive Server Enterprise Monitor Client
Library Programmer’s Guide.
Historical Server concepts
This section describes the following Historical Server concepts:
• Recording sessions
• Playback sessions
• Views
• Data items and statistic types