系统视图
CnosDB 提供了系统视图用来查看集群状态和集群 Schema 信息。
cluster_schema：用于存放集群信息。information_schema：用于存放租户信息。usage_schema：用户存放用量信息。
cluster_schema
tenants
SELECT * FROM cluster_schema.tenants;
+-------------+----------------------------------------------------------------------------------------------+
| tenant_name | tenant_options |
+-------------+----------------------------------------------------------------------------------------------+
| cnosdb | {"comment":"system tenant","limiter_config":null,"drop_after":null,"tenant_is_hidden":false} |
+-------------+----------------------------------------------------------------------------------------------+
users
SELECT * FROM cluster_schema.users;
+-----------+----------+--------------------------------------------------------------------------------+
| user_name | is_admin | user_options |
+-----------+----------+--------------------------------------------------------------------------------+
| root | true | {"hash_password":"*****","must_change_password":true,"comment":"system admin"} |
+-----------+----------+--------------------------------------------------------------------------------+
information_schema
databases
+-------------+---------------+-----+-------+----------------+---------+-----------+
| tenant_name | database_name | ttl | shard | vnode_duration | replica | precision |
+-------------+---------------+-----+-------+----------------+---------+-----------+
| cnosdb | usage_schema | INF | 1 | 365 Days | 1 | NS |
| cnosdb | public | INF | 1 | 365 Days | 1 | NS |
+-------------+---------------+-----+-------+----------------+---------+-----------+
tables
SELECT * FROM information_schema.tables;
+--------------+----------------+---------------------+------------+--------------+---------------+
| table_tenant | table_database | table_name | table_type | table_engine | table_options |
+--------------+----------------+---------------------+------------+--------------+---------------+
| cnosdb | usage_schema | http_writes | TABLE | TSKV | TODO |
| cnosdb | usage_schema | vnode_cache_size | TABLE | TSKV | TODO |
| cnosdb | usage_schema | coord_data_in | TABLE | TSKV | TODO |
| cnosdb | usage_schema | http_data_out | TABLE | TSKV | TODO |
| cnosdb | usage_schema | http_write_duration | TABLE | TSKV | TODO |
| cnosdb | usage_schema | coord_data_out | TABLE | TSKV | TODO |
| cnosdb | usage_schema | http_queries | TABLE | TSKV | TODO |
| cnosdb | usage_schema | http_data_in | TABLE | TSKV | TODO |
| cnosdb | usage_schema | http_query_duration | TABLE | TSKV | TODO |
| cnosdb | usage_schema | vnode_disk_storage | TABLE | TSKV | TODO |
| cnosdb | usage_schema | coord_queries | TABLE | TSKV | TODO |
| cnosdb | usage_schema | coord_writes | TABLE | TSKV | TODO |
+--------------+----------------+---------------------+------------+--------------+---------------+
columns
SELECT * FROM information_schema.columns;
+-------------+---------------+---------------------+-------------+-------------+------------------+----------------+-------------+-----------------------+-------------------+
| tenant_name | database_name | table_name | column_name | column_type | ordinal_position | column_default | is_nullable | data_type | compression_codec |
+-------------+---------------+---------------------+-------------+-------------+------------------+----------------+-------------+-----------------------+-------------------+
| cnosdb | usage_schema | http_writes | time | TIME | 0 | NULL | false | TIMESTAMP(NANOSECOND) | DEFAULT |
| cnosdb | usage_schema | http_writes | api | TAG | 1 | NULL | true | STRING | DEFAULT |
| cnosdb | usage_schema | http_writes | database | TAG | 2 | NULL | true | STRING | DEFAULT |
| cnosdb | usage_schema | http_writes | host | TAG | 3 | NULL | true | STRING | DEFAULT |
| cnosdb | usage_schema | http_writes | node_id | TAG | 4 | NULL | true | STRING | DEFAULT |
| cnosdb | usage_schema | http_writes | tenant | TAG | 5 | NULL | true | STRING | DEFAULT |
| cnosdb | usage_schema | http_writes | user | TAG | 6 | NULL | true | STRING | DEFAULT |
| ... ... |
enabled_roles
SELECT * FROM information_schema.enabled_roles;
+-----------+
| role_name |
+-----------+
+-----------+
roles
SELECT * FROM information_schema.roles;
+-----------+-----------+--------------+
| role_name | role_type | inherit_role |
+-----------+-----------+--------------+
| owner | system | |
| member | system | |
+-----------+-----------+--------------+
database_privileges
SELECT * FROM information_schema.database_privileges;
+-------------+---------------+----------------+-----------+
| tenant_name | database_name | privilege_type | role_name |
+-------------+---------------+----------------+-----------+
+-------------+---------------+----------------+-----------+
members
SELECT * FROM information_schema.members;
+-----------+-----------+
| user_name | role_name |
+-----------+-----------+
+-----------+-----------+
queries
SELECT * FROM information_schema.queries;
+----------------------+------------+-------------------------------------------+----------------------------------------+-----------+----------------------------------------+-------------+-----------+-------------+-----------------+-------------+
| query_id | query_type | query_text | user_id | user_name | tenant_id | tenant_name | state | duration | processed_count | error_count |
+----------------------+------------+-------------------------------------------+----------------------------------------+-----------+----------------------------------------+-------------+-----------+-------------+-----------------+-------------+
| 11368439095065267093 | batch | SELECT * FROM information_schema.queries; | 78322384368497284380257291774744000002 | root | 78322384368497284380257291774744000001 | cnosdb | OPTMIZING | 0.002147042 | 0 | 0 |
+----------------------+------------+-------------------------------------------+----------------------------------------+-----------+----------------------------------------+-------------+-----------+-------------+-----------------+-------------+
usage_schema
coord_data_in
DESCRIBE TABLE usage_schema.coord_data_in;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
coord_data_out
DESCRIBE TABLE usage_schema.coord_data_out;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
coord_queries
DESCRIBE TABLE usage_schema.coord_queries;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
coord_writes
DESCRIBE TABLE usage_schema.coord_writes;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
http_data_in
DESCRIBE TABLE usage_schema.http_data_in;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| api | STRING | TAG | DEFAULT |
| host | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| user | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
| database | STRING | TAG | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
http_data_out
DESCRIBE TABLE usage_schema.http_data_out;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| api | STRING | TAG | DEFAULT |
| host | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| user | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
http_queries
DESCRIBE TABLE usage_schema.http_queries;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| api | STRING | TAG | DEFAULT |
| host | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| user | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
http_query_duration
DESCRIBE TABLE usage_schema.http_query_duration;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| api | STRING | TAG | DEFAULT |
| host | STRING | TAG | DEFAULT |
| le | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| user | STRING | TAG | DEFAULT |
| value | DOUBLE | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
sql_data_in
DESCRIBE TABLE usage_schema.sql_data_in;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
vnode_cache_size
DESCRIBE TABLE usage_schema.vnode_cache_size;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| vnode_id | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+
vnode_disk_storage
DESCRIBE TABLE usage_schema.vnode_disk_storage;
+-------------+-----------------------+-------------+-------------------+
| column_name | data_type | column_type | compression_codec |
+-------------+-----------------------+-------------+-------------------+
| time | TIMESTAMP(NANOSECOND) | TIME | DEFAULT |
| database | STRING | TAG | DEFAULT |
| node_id | STRING | TAG | DEFAULT |
| tenant | STRING | TAG | DEFAULT |
| vnode_id | STRING | TAG | DEFAULT |
| value | BIGINT UNSIGNED | FIELD | DEFAULT |
+-------------+-----------------------+-------------+-------------------+