<p>This article describes how to view the modification history of a parameter.</p> <p><strong>Overview</strong></p> <p>If you need to locate the modifications of a parameter value when malfunction occurs, you can view the modification history of the parameter in the RDS console.</p> <p><strong>Prerequisites</strong></p> <p>You have successfully modified a parameter value. For more information, see <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_PostgreSQL.Parameter.Edit_Parameter" target="_blank">Modify Parameters</a> or <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_PostgreSQL.Parameter.Import_Parameters" target="_blank">Import Parameters</a>.</p> <p><strong>Procedures</strong></p> <p>1.&nbsp; Log in to the <a href="http://pinganyun.com/console/rds/overview" target="_blank">RDS Console</a>.</p> <p>2.&nbsp; In the left navigation pane, click <strong>RDS-PostgreSQL</strong> to enter the <strong>DBPaaS for RDS-PostgreSQL</strong> page.</p> <p>3.&nbsp; Select the target region.</p> <p>4.&nbsp; In the <strong>Operation</strong> column of the target instance, click <strong>Manage</strong>. Click <strong>Parameters</strong> tab.</p> <p>5.&nbsp; Select <strong>Parameter History</strong> to view the modification history of all parameters of the account.</p> <table border="1" cellpadding="0" cellspacing="0"> <tbody> <tr> <td style="background-color:#ededed; vertical-align:top"> <p><strong>Configuration item</strong></p> </td> <td style="background-color:#ededed; vertical-align:top"> <p><strong>Description</strong></p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Parameter Name</p> </td> <td style="vertical-align:top"> <p>Name of parameter whose value is to be modified.</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Pre-altered Parameters</p> </td> <td style="vertical-align:top"> <p>Value of the parameter before modification.</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Altered Parameters</p> </td> <td style="vertical-align:top"> <p>Value of the parameter after modification.</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Take Effect</p> </td> <td style="vertical-align:top"> <p>Whether the modification takes effect. Currently, the following items are supported:</p> <p>&bull;&nbsp; Effective: The modified parameter value is the current value of the parameter.</p> <p>&bull;&nbsp; History: The history value of the parameter.</p> </td> </tr> <tr> <td style="vertical-align:top"> <p>Alteration Time</p> </td> <td style="vertical-align:top"> <p>The time when the parameter is modified.</p> </td> </tr> </tbody> </table> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20200707103754-15059aee91c6.png" style="height:271px; width:830px" /></p>