转换目标逻辑备用库角色为主库角色。
Step 5 Switch the target physical standby database role to the primary role.
记住，您可能需要将开发库与主库文件包分开安装。
Remember that you may need to install the development libraries separately from the main library package.
这样，所有的客户端都可以在主库上看到同样的数据。
一旦数据库装载后，数据库就能从主库接收归档重做日志。
Once mounted, the database can receive archived redo data from the primary database.
2003年诺贝尔文学奖得主库切的两部重要长篇小说迈克尔。
J. M. Coetzee, the winner of Nobel literature prize in 2003, his novel Life and Time of Michael.
同样的，你可以在主库删除日志文件组或成员而不影响你的备库。
Similarly, you can drop log file groups or members from the primary database without affecting your standby database.
你可以在主库添加或删除在线重做日志组或者日志成员而不影响备库。
You can add or drop online redo log file groups or members to the primary database without affecting the standby database.
当物理备库是打开时，来自主库的重做数据被备库接收，但是不会被应用。
When a physical standby database is open, redo data from the primary database is received by the standby database, but the log files are not applied.
不仅是在主库宕机的时候，当你需要对服务器进行维护的时候，这都成为了问题。
This is a problem not only when the database fails, but when you want to perform maintenance on the server.
在接到确认信息后，主库把相应结果反馈给客户端，客户端将在那时进行处理。
Upon receiving acknowledgment, the master returns a result to the client, which then can proceed.
在接到确认信息后，主库把相应结果反馈给客户端，客户端将在那时进行处理。
After the commit and before slave acknowledgment, other clients can see the committed transaction before the committing client.
将只读的从库提升为主库可以使尽快恢复服务，但是这种切换需要系统管理员的关注和动手。
Promoting one of the read slaves to master allows you to recover relatively quickly, but this switcharoo requires hands-on attention from the sysadmins.
在有点伤，你需要在备库上重新应用重做数据，应用归档日志来同步备库和主库之间的数据。
At some point, you need to resume redo apply on the standby database, and apply the archived redo log files to resynchronize the standby database with the primary database.
依此作为约束条件，以主库弃水量最小为目标，提出了北大港水库优化调度的问题，并予以求解。
In order to reach the aim of the lowest loss water of main reservoir, the best dispatching problem is drawn and come to a conclusion.
无论何时，你在主库添加在线重做日志文件，你应该在备库添加相应的在线重做日志和备用重做日志文件。
Whenever you add an online redo log file to the primary database, you should add corresponding online and standby redo log files to the standby database.
下载包含一个 asrc/facebook.php文件（这是主库）和一个examples/example.php 文件。
The download contains a src/facebook.php file (this is the main library) and an examples/example.php file.
在应用了扩展MBean提供程序定义之后(无论是否保存到主库)，这个定义将出现在这个服务器的Extension MBeanProviders页面中(图8)。
Once the Extension MBean Provider definition has been applied (whether saved to the master repository or not), it will show up in the Extension MBean Providers page for this server (Figure 8).
在应用了扩展MBean提供程序定义之后(无论是否保存到主库)，这个定义将出现在这个服务器的Extension MBeanProviders页面中(图8)。
Once the Extension MBean Provider definition has been applied (whether saved to the master repository or not), it will show up in the Extension MBean Providers page for this server (Figure 8).
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