关于dispatchers 各版本对比,及Re…

本文详细介绍了 Oracle 数据库中 DISPATCHERS 参数的相关信息,包括不同版本的参数特性、可修改性及可能遇到的错误消息及其解决办法。

dispatchers<wbr></wbr><wbr><wbr><wbr><span style="font-weight: normal; color: rgb(0, 0, 0);"><br></span></wbr></wbr></wbr>

<本文转自http://www.orafaq.com/parms/parm508.htm>


<wbr><wbr><wbr><wbr><font style="font-size: 20px;">Oracle 11.1.0:</font> <table style="font-family: Arial; font-size: 12px; color: rgb(0, 0, 139); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;" border="1"><tbody> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Parameter Name:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Description:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> specifications of dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Type:</td> <td style="font-family: Arial; font-size: 12px;">CHAR</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Obsoleted:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Can ALTER SESSION:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Can ALTER SYSTEM:</td> <td style="font-family: Arial; font-size: 12px;">IMMEDIATE</td> </tr> </tbody></table> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 10.2.0:</h3> <table style="font-family: Arial; font-size: 12px; color: rgb(0, 0, 139); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;" border="1"><tbody> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Parameter Name:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Description:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> specifications of dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Type:</td> <td style="font-family: Arial; font-size: 12px;">CHAR</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Obsoleted:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Can ALTER SESSION:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Can ALTER SYSTEM:</td> <td style="font-family: Arial; font-size: 12px;">IMMEDIATE</td> </tr> </tbody></table> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 10.1.0:</h3> <table style="font-family: Arial; font-size: 12px; color: rgb(0, 0, 139); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;" border="1"><tbody> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Parameter Name:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Description:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> specifications of dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Type:</td> <td style="font-family: Arial; font-size: 12px;">CHAR</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Obsoleted:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Can ALTER SESSION:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Can ALTER SYSTEM:</td> <td style="font-family: Arial; font-size: 12px;">IMMEDIATE</td> </tr> </tbody></table> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 9.2.0:</h3> <table style="font-family: Arial; font-size: 12px; color: rgb(0, 0, 139); font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;" border="1"><tbody> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Parameter Name:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Description:</td> <td colspan="3" style="font-family: Arial; font-size: 12px;"> specifications of dispatchers</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Type:</td> <td style="font-family: Arial; font-size: 12px;">CHAR</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Obsoleted:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> </tr> <tr> <td style="font-family: Arial; font-size: 12px;" bgcolor="#D0D0D0"> Can ALTER SESSION:</td> <td style="font-family: Arial; font-size: 12px;">FALSE</td> <td style="font-family: Arial; font-size: 12px;" align="right" bgcolor="#D0D0D0">Can ALTER SYSTEM:</td> <td style="font-family: Arial; font-size: 12px;">IMMEDIATE</td> </tr> </tbody></table> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 8.1.7:</h3> <span style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); display: inline ! important; float: none; text-indent: 2em;">No such parmeter in Oracle 8.1.7.</span> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 8.0.6:</h3> <span style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); display: inline ! important; float: none; text-indent: 2em;">No such parmeter in Oracle 8.0.6.</span> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Oracle 7.3.4:</h3> <span style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); display: inline ! important; float: none; text-indent: 2em;">No such parmeter in Oracle 7.3.4.</span> <hr style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <h3 style="color: rgb(102, 102, 153); background-color: rgb(255, 255, 255); font-family: helvetica,arial,serif; font-size: 16pt; font-weight: bold; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; text-indent: 2em;"> Related Error Messages:</h3> <b style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;">ORA-00101: invalid specification for system parameter DISPATCHERS</b> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The syntax for the DISPATCHERS parameter is incorrect. <p><b>Action:</b><span><wbr></wbr></span>Refer to the manual for correct syntax.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-00102: network protocol %s cannot be used by dispatchers</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The network specified in DISPATCHERS does not have the functionality required by the dispatchers. <p><b>Action:</b><span><wbr></wbr></span>Refer to the manual on network protocols supported by the dispatchers.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-00113: protocol name %s is too long</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>A protocol name specified in the DISPATCHERS system parameter is too long. <p><b>Action:</b><span><wbr></wbr></span>Use a valid protocol name for the DISPATCHERS value.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-00134: invalid DISPATCHERS specification #%s</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The syntax for the n-th DISPATCHERS specification was incorrect. <p><b>Action:</b><span><wbr></wbr></span>Refer to the Oracle Reference Manual for the correct syntax.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-02066: missing or invalid DISPATCHERS text</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>A character string literal was expected, but not found, following ALTER SYSTEM SET DISPATCHERS <p><b>Action:</b><span><wbr></wbr></span>place the string literal containing the dispatcher's specification after ALTER SYSTEM SET DISPATCHERS</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-12509: TNS:listener failed to redirect client to service handler</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The dispatcher terminated unexpectedly <p><b>Action:</b><span><wbr></wbr></span>Attempt to connect again and if the same error occurs,contact the DBA to check the state of the dispatchers for this SID.If the problem persists, turn on tracing in the listener to determinethe TNS error caused by the redirect.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-12510: TNS:database temporarily lacks resources to handle the request</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The dispatchers appear to be busy handling other requests. <p><b>Action:</b><span><wbr></wbr></span>Attempt the connection again. If error persists, askthe DBA to increase the number of dispatchers and/or dispatchers' limit on number of connections/sessions that they can accept.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-12511: TNS:service handler found but it is not accepting connections</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The dispatchers notified the listener that they temporarily do not accept new connections. <p><b>Action:</b><span><wbr></wbr></span>Attempt the connection again. If error persists, contact the DBAto check the state of the dispatchers and/or ask him to increase the numberof dispatchers.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-12513: TNS:service handler found but it has registered for a different protocol</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>The dispatchers registered for this service are connected tothe listener by way of a different network protocol than that of the client. <p><b>Action:</b><span><wbr></wbr></span>Contact the DBA to register a dispatcher on your protocol.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-32021: parameter value longer than %s characters</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>An attempt was made to alter a parameter value but the number of characters in the parameter value was longer than the allowed maximum. For a list parameter, one of the values in the list was longer than the allowed maximum. <p><b>Action:</b><span><wbr></wbr></span>Reduce the parameter value length and retry the command. For the DISPATCHERS parameter, use listener aliases to reduce value length.</p> </div> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <b>ORA-32022: parameter value longer than %s characters</b></p> <div style="background-color: rgb(255, 255, 255); color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; margin-left: 2em; orphans: 2; text-indent: 2em; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px"> <b>Cause:</b><span><wbr></wbr></span>An attempt was made to alter a parameter value but the combined length of all the parameter values was more than the allowed maximum. <p><b>Action:</b><span><wbr></wbr></span>Reduce the parameter value length and retry the command. For the DISPATCHERS parameter, use listener aliases to reduce value length.</p> </div> <hr style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> <p style="color: rgb(0, 0, 139); font-family: Arial; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; background-color: rgb(255, 255, 255); text-indent: 2em;"> This parameter is documented in the<span><wbr></wbr></span><a href="http://www.oracle.com/pls/db111/drilldown?remark=quick_search&amp;word=dispatchers&amp;tab_id=">Oracle Server Reference Guide</a>. Search for more info about [<a href="http://www.orafaq.com/cgi-bin/search/query/dispatchers">dispatchers</a><span><wbr></wbr></span>] on the Oracle FAQ.</p> </wbr></wbr></wbr></wbr>
<think>嗯,用户想知道Oracle数据库dispatchers参数的作用和配置方法。首先,我需要回忆一下Oracle的架构,特别是关于共享服务器模式的部分。记得在专用服务器模式下,每个连接都有一个专用进程,而共享服务器模式则使用调度进程(dispatchers)来处理多个用户进程的连接请求,这样可以更高效地利用资源。 那dispatchers参数的具体作用是什么呢?应该是用来配置调度进程的数量和类型,比如TCP/IP或其他协议。用户可能需要知道如何设置这个参数来优化连接管理,特别是在高并发环境下。需要解释DISPATCHERS参数的结构,比如PROTOCOL、DISPATCHERS数量、LISTENER等属性。 接下来是配置方法,应该分步骤说明如何用ALTER SYSTEM命令修改,或者直接修改spfile。例如,设置DISPATCHERS='(PROTOCOL=TCP)(DISPATCHERS=3)'。还要提到查看当前配置的方法,比如查询V$DISPATCHER视图。 另外,用户可能不知道共享服务器和专用服务器的区别,需要简要说明两者的不同,以及何时使用共享服务器模式。可能还需要提到相关的其他参数,比如SHARED_SERVERS和MAX_SHARED_SERVERS,这些参数是否也需要调整? 还有,需要注意配置后的验证步骤,如何检查调度进程的状态,是否有监听器配置的关联。可能需要引用Oracle的文档或错误消息资料,比如引用[^3]关于实例结构的描述,或者引用[^1]中提到的账户配置相关内容? 用户可能还会遇到配置错误,比如端口冲突或协议不支持,这时候需要如何排查?例如检查监听日志或使用lsnrctl status命令。这部分可以作为常见问题解答,帮助用户避免常见陷阱。 最后,生成相关问题的时候,要考虑用户可能进一步想了解的内容,比如如何监控调度进程的性能,或者共享服务器模式下的限制,以及如何优化配置参数。确保问题覆盖配置、优化、故障排除等方面,方便用户深入探索。</think>### Oracle数据库dispatchers参数的作用及配置方法 #### 1. **参数作用** `dispatchers`参数用于配置Oracle共享服务器模式(Shared Server Mode,旧称MTS: Multi-Threaded Server)中的调度进程(Dispatcher Process)。 - **核心功能**:调度进程负责接收客户端连接请求,将请求分配给共享服务器进程处理,并通过监听器(Listener)协调通信。 - **适用场景**:适用于高并发、短事务的OLTP系统,可减少系统进程数量,优化资源利用率。 #### 2. **参数配置语法** 基本格式: $$ \text{DISPATCHERS = '(PROTOCOL=协议)(属性=值)...)'} $$ **关键属性**: - `PROTOCOL`:指定网络协议(如TCP、TCPS、IPC) - `DISPATCHERS`:指定调度进程数量 - `LISTENER`:关联的监听器名称 - `SERVICE`:指定服务名 **示例配置**: ```sql ALTER SYSTEM SET dispatchers = '(PROTOCOL=TCP)(DISPATCHERS=5)(SERVICE=orclXDB)'; ``` #### 3. **配置步骤** 1. **修改参数**: ```sql -- 动态修改(需重启实例生效) ALTER SYSTEM SET dispatchers = '(PROTOCOL=TCP)(DISPATCHERS=3)'; -- 或直接修改spfile ``` 2. **验证配置**: ```sql SELECT name, network FROM v$dispatcher; -- 查看调度进程状态 SHOW PARAMETER dispatchers; -- 显示当前参数值 ``` 3. **关联监听器**: 确保监听器(`listener.ora`)配置与`dispatchers`参数匹配,例如: ```ini LISTENER = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = dbserver)(PORT = 1521))) ``` #### 4. **注意事项** - 需同时配置`shared_servers`参数定义共享服务器进程数量 - 调度进程过多可能导致内存浪费,需根据并发量调整 - TCP协议下需避免端口冲突(默认端口可通过`ADDRESS`属性指定) ---
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