ORA-16627: operation disallowed since no standby databases would remain to support protection mode
Cause: This status was returned because of one of the following:
– The broker rejected an attempt to change the overall configuration protection mode since it could not find any enabled standby databases that supported the proposed protection mode.
– The broker rejected an attempt to enable the configuration if it determined that there were no enabled standby databases that supported the overall protection mode.
– The broker rejected an attempt to disable or remove a database that, if disabled or deleted, would result in no remaining standby databases that could support the overall configuration protection mode.
– The broker rejected an attempt to switchover if doing so would violate the overall configuration protection mode.
– Performing automatic health check if the broker determined that no standby datbases supported the overall protection mode.
Action: – If changing the overall protection mode, confirm that at least one standby database satisfies the new protection mode.
– For enable failures, confirm that at least one standby database has a LogXptMode configurable property setting that supports the current overall protection mode.
– For delete and disable failures, confirm that at least one other standby database has a LogXptMode configurable property setting that supports the overall protection mode.
– For switchover failures that occur when the configuration is operating in maximum protection or maximum availability mode, confirm that at least one other standby database has its LogXptMode configurable property set to the value “SYNC”. If the configuration contains a primary database and a single standby database and is operating in either maximum protection or maximum availability mode, ensure that the LogXptMode configurable property of the primary database is set to the value “SYNC”. Since the old primary database will become the standby database after switchover completes, its LogXptMode configurable property setting must support the configuration protection mode.
– For health check error, confirm that at least one standby database has a LogXptMode configurable property setting that supports the current overall protection mode.
ORA-16627 错误是Oracle数据库故障诊断管理器(ADM)发出的一种错误。它表明在一个防护模式下，没有保留备用数据库来支持这种模式，所以不能执行此操作。
ORA-16627表示尝试执行所涉及的操作会耗尽现有备用数据库，从而使系统处于受保护模式。在这种情况下不允许这么做，因为必须至少有一个备用数据库才可以维护受保护模式的实例。
ORA-16627是在Oracle RAC环境中常见的一个错误，通常会在用户尝试从受保护模式转换回非受保护模式时发生。
1.要解决ORA-16627错误，首先需要检查数据库中是否有备用数据库。
2. 如果没有备用数据库，可以重新安建一个新的备用数据库，并尝试再次转换。
3.在系统中删除不需要备用数据库的节点，从而确保系统中有一个剩余的备用数据库。
4.重新建立一个备用数据库，然后再尝试转换。
5.在系统中安装更多的新节点，确保备用数据库的数量足够支持其节点。
6. 确保系统中有足够数量的备用数据库，然后再次尝试转换。