Database Status

After databases are connected, run the following commands to check the database list and synchronization status:

View the kernel version.
```
select version();
```
Check database status.
```
show databases;
```
Check synchronization status.
Querying binlog information will occupy the hourly query quota of GaussDB(for MySQL). You are advised to run this command at most once a minute.
```
show full slave status;
```
Check snapshot status.
```
show snapshot status;
```
The status field is valid only when snapshots are enabled.
- READY: ready for query.
- NOT_READY: not ready and cannot be used.
- ERROR: synchronization or update errors.
- RECONNECTING: Synchronization link disconnected.
- PREPARING_UPDATE: ready for update.
- UPDATING: updating.