本章节将介绍 YashanDB 数据库的实例启停方式。数据库安装过程中将实例自动切换成 OPEN 阶段，并创建名为 yashandb 的数据库。
执行如下 SQL 命令查看当前实例状态及数据库名称：
SELECT status FROM V$INSTANCE;
STATUS-----------------OPEN
SELECT database_name FROM V$DATABASE;
DATABASE_NAME----------------------------------------------------------------yashandb
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执行如下命令关闭 YashanDB 服务：
$ yasboot cluster stop -c yashandb type | uuid | name | hostid | index | status | return_code | progress | cost---------------------------------------------------------------------------------------------------------- task | 3b62bda48bad7fd1 | StopYasdbCluster | - | yashandb | SUCCESS | 0 | 100 | 1------+------------------+------------------+--------+----------+---------+-------------+----------+------task completed, status: SUCCESS
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执行如下命令开启 YashanDB 服务，同时会将实例切换至 OPEN 阶段：
$ yasboot cluster start -c yashandb type | uuid | name | hostid | index | status | return_code | progress | cost---------------------------------------------------------------------------------------------------------- task | 3b62bda48bad7fd1 | StopYasdbCluster | - | yashandb | SUCCESS | 0 | 100 | 1------+------------------+------------------+--------+----------+---------+-------------+----------+------task completed, status: SUCCESS
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执行如下命令重启 YashanDB 数据库，并将实例启动至 OPEN 阶段：
$ yasboot cluster restart -c yashandb type | uuid | name | hostid | index | status | return_code | progress | cost------------------------------------------------------------------------------------------------------------- task | 78d6449df62594b5 | ReStartYasdbCluster | - | yashandb | SUCCESS | 0 | 100 | 3------+------------------+---------------------+--------+----------+---------+-------------+----------+------task completed, status: SUCCESS
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执行如下命令重启 YashanDB 数据库，并将实例启动至 NOMOUNT 阶段：
$ yasboot cluster restart -c yashandb -m nomount type | uuid | name | hostid | index | status | return_code | progress | cost------------------------------------------------------------------------------------------------------------- task | 78d6449df62594b5 | ReStartYasdbCluster | - | yashandb | SUCCESS | 0 | 100 | 3------+------------------+---------------------+--------+----------+---------+-------------+----------+------task completed, status: SUCCESS
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执行如下命令重启 YashanDB 数据库，并将实例启动至 MOUNT 阶段：
$ yasboot cluster restart -c yashandb -m mount type | uuid | name | hostid | index | status | return_code | progress | cost------------------------------------------------------------------------------------------------------------- task | 78d6449df62594b5 | ReStartYasdbCluster | - | yashandb | SUCCESS | 0 | 100 | 3------+------------------+---------------------+--------+----------+---------+-------------+----------+------task completed, status: SUCCESS
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Note:
如需进行正常的数据库操作，请将实例切换至 OPEN 阶段。
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