课程第50/51/52次（2018-10-26星期五、2018-10-29星期一和2018-11-02星期五）
$ srvctl stop instance -db racdb -node station12-force
$ srvctl status database -db racdb
Instance RACDB_2 is running on node station11
Instance RACDB_1 is not running on node station12
$ srvctl convert database -h
Convert RAC One Node database to RAC database having one instance.
Usage: srvctl convert database -db <db_unique_name> -dbtype RAC [-node <node>]
-db <db_unique_name> Unique name of database to convert
-dbtype <type> Type of database to which to convert: RAC
-node <node> Candidate server for administrator-managed RAC database to run on
-help Print usage
Convert RAC database having one instance to RAC One Node database.
Usage: srvctl convert database -db <db_unique_name> -dbtype RACONENODE [-instance <inst_name>] [-timeout <timeout>]
-db <db_unique_name> Unique name of database to convert
-dbtype <type> Type of database to which to convert: RACONENODE
-instance <inst_name> Instance name prefix; required for administrator-managed RAC One Node database
-timeout <timeout> Online relocation timeout in minutes
-help Print usage
12c OCMDataguard：
DGMGRL> edit database 'prod5h1' set property TransportLagThreshold=30;
Property "transportlagthreshold" updated
DGMGRL> edit database 'prod5h2' set property TransportLagThreshold=30;
Property "transportlagthreshold" updated
DGMGRL> edit database 'prod5h1' set property ApplyLagThreshold=45;
Property "applylagthreshold" updated
DGMGRL> edit database 'prod5h2' set property ApplyLagThreshold=45;
Property "applylagthreshold" updated
12c MAA环境（可以在16G内存的笔记本环境中实现）：
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