February 10, 2018

Read e-book online A First Course in Database Systems (3rd Edition) PDF

By Jeffrey D. Ullman

ISBN-10: 0144006375

ISBN-13: 9780144006373

Foreign reprint version. Paperback. released in China. Contents in ENGLISH and completely similar as US variation.

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Extra info for A First Course in Database Systems (3rd Edition)

Example text

The details on how to use and set up this pool can be found in Chapter 3. DefaultPool Every user logged in to the Grid Control application will use a connection from this pool. Since the connections are pooled and reused, multiple Administrators logged in to the Console can be using the same connection on the OMS to process the requests. SystemPool This is used for all internal OMS operations and housekeeping tasks. All data that needs to be persisted is saved in the repository. This can come from Agents in the form of metadata (target definitions, metric settings), state data (condition of the targets and metric run on that target), configuration data, and metric data.

Table 1-1 describes the use of these ports. Port Used By Communication To and From 1159 OMS Server Used by the Agents to communicate to the OMS servers in a secure way. 1521 Repository Used by the OMS servers to communicate to the repository database listener. 3872 Agents Used by the OMS servers to communicate to the Agents. Can be either secure or unsecure. 4444 OMS Server Used by the Administrator’s browser UI to communicate to the OMS server (HTTP Server) in a secure way. The traffic will be redirected to port 8250.

Note Webcache is not a strict requirement for the application rollout. Given the dynamic nature of Grid Control, with pages getting constructed on the fly based on the specifics specified by the logged-in user, the benefic of using Webcache to speed up the web pages is very limited. It is needed only if end-user monitoring is used to track the usage of specific URLs of the application. Users logging in to Grid Control can use either of these two sets of ports. The reason for the second set of ports is to separate the traffic from the Agents from traffic from the people using Grid Control.

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A First Course in Database Systems (3rd Edition) by Jeffrey D. Ullman


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