The SHOW RANGE ... FOR ROW statement shows information about a range for a particular row of data. This information is useful for verifying how SQL data maps to underlying ranges, and where the replicas for a range are located.
This is an experimental feature. The interface and output are subject to change.
To show information about the ranges that comprise the data for a table, index, or entire database, use the SHOW RANGES statement.
Synopsis
Required privileges
The user must have the SELECT privilege on the target table.
Parameters
| Parameter | Description |
|---|---|
table_name |
The name of the table that contains the row that you want range information about. |
table_index_name |
The name of the index for the row that you want range information about. |
row_vals |
The values of the row whose range information you want to show. |
Response
The following fields are returned:
| Field | Description |
|---|---|
start_key |
The start key for the range. |
end_key |
The end key for the range. |
range_id |
The range ID. |
lease_holder |
The node that contains the range's leaseholder. |
lease_holder_locality |
The locality of the leaseholder. |
replicas |
The nodes that contain the range replicas. |
replica_localities |
The locality of the range. |
Examples
Setup
The following examples use MovR, a fictional vehicle-sharing application, to demonstrate CockroachDB SQL statements. For more information about the MovR example application and dataset, see MovR: A Global Vehicle-sharing App.
To follow along, run cockroach demo with the --geo-partitioned-replicas flag. This command opens an interactive SQL shell to a temporary, 9-node in-memory cluster with the Geo-Partitioned Replicas Topology applied to the movr database.
$ cockroach demo --geo-partitioned-replicas
Show range information for a row in a table
> SELECT * FROM [SHOW RANGE FROM TABLE users FOR ROW ('ae147ae1-47ae-4800-8000-000000000022', 'amsterdam', 'Tyler Dalton', '88194 Angela Gardens Suite 94', '4443538758')];
start_key | end_key | range_id | lease_holder | lease_holder_locality | replicas | replica_localities
+--------------+------------------------+----------+--------------+--------------------------+----------+------------------------------------------------------------------------------------+
/"amsterdam" | /"amsterdam"/PrefixEnd | 47 | 9 | region=europe-west1,az=d | {7,8,9} | {"region=europe-west1,az=b","region=europe-west1,az=c","region=europe-west1,az=d"}
(1 row)
Show range information for a row by a secondary index
> SELECT * FROM [SHOW RANGE FROM INDEX vehicles_auto_index_fk_city_ref_users FOR ROW ('aaaaaaaa-aaaa-4800-8000-00000000000a', 'amsterdam', 'scooter', 'c28f5c28-f5c2-4000-8000-000000000026', '2019-01-02 03:04:05+00:00', 'in_use', '62609 Stephanie Route', '{"color": "red"}')];
start_key | end_key | range_id | lease_holder | lease_holder_locality | replicas | replica_localities
+--------------+------------------------+----------+--------------+--------------------------+----------+------------------------------------------------------------------------------------+
/"amsterdam" | /"amsterdam"/PrefixEnd | 94 | 8 | region=europe-west1,az=c | {7,8,9} | {"region=europe-west1,az=b","region=europe-west1,az=c","region=europe-west1,az=d"}
(1 row)
See also
SHOW RANGESSPLIT ATCREATE TABLECREATE INDEX- Indexes
- Partitioning tables
- Follow-the-Workload
- Architecture Overview
Was this helpful?
