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
Copied!
Note:
如需进行正常的数据库操作，请将实例切换至OPEN阶段。
