44-1: Advanced Datasource Parameters in Java

Connect qr-codes in Java 44-1: Advanced Datasource Parameters
Table 44-1: Advanced Datasource Parameters
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Parameter Name Connection String Description If a database driver accepts connection strings, you can provide any additional connection parameters in the form of a connection string provided in this parameter. If this option is enabled, ColdFusion limits the number of simultaneous database requests according to the number provided in the setting for Restrict Connections To. See the description of the preceding parameter for information. If this parameter is enabled, ColdFusion connects to the datasource once for a given client instead of reconnecting on every request. See Timeout (min) and Interval (min) for more information.
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Limit Connections
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Restrict Connections To Maintain Connections
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Parameter Name Timeout (min)
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Description If you are maintaining connections and the time between a client s requests is greater than this number of minutes, ColdFusion expires the cached connection. If you are maintaining connections, ColdFusion checks every x number of minutes for expired connections. If this option is enabled, no application can use this datasource. In connecting to a database, ColdFusion waits this number of seconds before timing out the attempt and throwing an error. Enabling this option enables ColdFusion to retrieve the entire contents of a CLOB field (meaning a Memo field in Access or a Text field in Microsoft SQL Server). Don t enable this parameter unless you are absolutely sure that you need it, as this option causes a large performance hit. Enabling this option enables ColdFusion to retrieve the entire contents of a BLOB field (meaning an Image field in Microsoft SQL Server). Don t enable this parameter unless you are absolutely sure that you need it, as this option causes a large performance hit. If CLOB retrieval is disabled, ColdFusion retrieves a maximum of this number of characters from a CLOB, Memo, or Text field and truncates the rest. The default is 64,000 characters. If BLOB retrieval is disabled, ColdFusion retrieves a maximum of this number of bytes from a BLOB or Image field and truncates the rest. The default is 64,000 bytes. This set of check boxes enables you to choose the SQL statements that can be executed through this datasource, enabling you to restrict what applications can do. This option exists only for SQL Server and Sybase datasources. The value can be either Direct, meaning to use a standard client-side retrieval (fine for nearly all users), or Cursor, meaning to use a server-side cursor (only for advanced developers). Don t change this option unless you have a compelling reason to do so. This option exists only for ODBC socket datasources. A trusted connection implies that, instead of using a username and password to access a database, the connection uses the name of the currently logged in user to connect. Using a Trusted Connection implies a Windows network and currently works only for Microsoft SQL Server.
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Interval (min) Disable Connections Login Timeout (sec) CLOB
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Java and JVM Settings
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The Java and JVM settings section of Administrator tells ColdFusion how to use the Java Virtual Machine (JVM). Naturally, these settings are rather sensitive and the defaults should be acceptable for most users. Modify these settings only if you have a compelling reason to do so.
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Part VIII ColdFusion MX Administration
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The Java Virtual Machine path tells ColdFusion where to find the Java Virtual Machine DLL (jvm.dll on Windows or jvm.so on Solaris). Don t modify this parameter unless the JVM location changes. Adjusting the Initial Memory Size and Maximum Memory upward is probably a good idea if you have the RAM to do so. The default maximum is 512MB, but don t set the maximum any lower than 32MB because ColdFusion may not be able to start up again. These settings control how much memory Java can allocate to ColdFusion. Our suggestion is to leave the Initial Memory Size value blank so that the JVM is unrestricted during ColdFusion startup, but explicitly specify a Maximum Memory value as large as your hardware, operating system, and other software requirements enable. One good indicator for how much you can safely increase the Maximum Memory value is the Available Physical Memory value that you should be measuring during your load tests. Consider increasing your JVM s Maximum Memory value if you still have RAM to spare during your load tests. The Classpath setting tells Java where to look for Java classes. This is a comma-delimited list of directories, JAR files, and/or ZIP files where ColdFusion looks for Java .class files. The only reason that you would need to modify this parameter is if you are using a custom Java extension such as a Java-based CFX custom tag or JSP tag library.
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