每个ob节点就一个数据文件，不用查询。/data/1/obdemo/sstable/block_file

这点跟oracle和mysql都不一样。

/data/1/obdemo/sstable/block_file 这个路径是固定的吗？ 我创建制定的不是这个目录是否可以，怎么能查询出这个路径

OB的数据文件物理上只有一个基线数据文件 block_file，在安装目录 store/sstable 下。通过 OBServer 进程启动时一次性创建，大小根据启动参数 datafile_disk_percentage
采用磁盘预分配策略，默认值为 95%，创建后无法调整大小。

你可以初始化启动observer进程时指定数据文件存放地址
通过一下参数查询可以知道数据文件所在的目录，实质是软连接指向/data/1下的数据文件：

obclient> show parameters like 'data_dir';
+-------+----------+--------------+----------+----------+-----------+------------------------------------+---------------------------------+---------+---------+---------+------------+
| zone  | svr_type | svr_ip       | svr_port | name     | data_type | value                              | info                            | section | scope   | source  | edit_level |
+-------+----------+--------------+----------+----------+-----------+------------------------------------+---------------------------------+---------+---------+---------+------------+
| zone3 | observer | 10.10.10.131 |     2882 | data_dir | NULL      | /home/admin/oceanbase/store/ob2273 | the directory for the data file | SSTABLE | CLUSTER | DEFAULT | READONLY   |
| zone2 | observer | 10.10.10.202 |     2882 | data_dir | NULL      | /home/admin/oceanbase/store/ob2273 | the directory for the data file | SSTABLE | CLUSTER | DEFAULT | READONLY   |
| zone1 | observer | 10.10.10.91  |     2882 | data_dir | NULL      | /home/admin/oceanbase/store/ob2273 | the directory for the data file | SSTABLE | CLUSTER | DEFAULT | READONLY   |
+-------+----------+--------------+----------+----------+-----------+------------------------------------+---------------------------------+---------+---------+---------+------------+
3 rows in set (0.01 sec)

obclient> 


[admin@ob211 ob2273]$ pwd
/home/admin/oceanbase/store/ob2273
[admin@ob211 ob2273]$ ll
total 4104
lrwxrwxrwx 1 admin admin      22 Jan  6 19:05 clog -> /data/log1/ob2273/clog
-rw-r--r-- 1 admin admin 2101248 Mar 15 15:07 clog_shm
lrwxrwxrwx 1 admin admin      22 Jan  6 19:05 ilog -> /data/log1/ob2273/ilog
-rw-r--r-- 1 admin admin 2101248 Jan  6 19:17 ilog_shm
lrwxrwxrwx 1 admin admin      26 Jan  6 19:05 oob_clog -> /data/log1/ob2273/oob_clog
lrwxrwxrwx 1 admin admin      22 Jan  6 19:05 slog -> /data/log1/ob2273/slog
lrwxrwxrwx 1 admin admin      23 Jan  6 19:05 sort_dir -> /data/1/ob2273/sort_dir
lrwxrwxrwx 1 admin admin      22 Jan  6 19:05 sstable -> /data/1/ob2273/sstable
[admin@ob211 ob2273]$