# groonga - An open-source fulltext search engine and column store.

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# 7.3.29. `logical_shard_list`

## 7.3.29.1. Summary

Note

This command is an experimental feature.

New in version 5.0.7.

`logical_shard_list` returns all existing shard names against the specified logical table name.

## 7.3.29.2. Syntax

This command takes only one required parameter:

    logical_shard_list logical_table

## 7.3.29.3. Usage

You need to register `sharding` plugin to use this command:

Execution example:

    plugin_register sharding
    # [[0, 1337566253.89858, 0.000355720520019531], true]

Here are sample shards:

Execution example:

    table_create  Logs_20150801           TABLE_HASH_KEY ShortText
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    column_create Logs_20150801 timestamp COLUMN_SCALAR  Time
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    table_create  Logs_20150802           TABLE_HASH_KEY ShortText
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    column_create Logs_20150802 timestamp COLUMN_SCALAR  Time
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    table_create  Logs_20150930           TABLE_HASH_KEY ShortText
    # [[0, 1337566253.89858, 0.000355720520019531], true]
    column_create Logs_20150930 timestamp COLUMN_SCALAR  Time
    # [[0, 1337566253.89858, 0.000355720520019531], true]

You can get the all shard names in ascending order by specifying `Logs` as the logical table name:

Execution example:

    logical_shard_list --logical_table Logs
    # [
    #   [
    #     0,
    #     1337566253.89858,
    #     0.000355720520019531
    #   ],
    #   [
    #     {
    #       "name": "Logs_20150801"
    #     },
    #     {
    #       "name": "Logs_20150802"
    #     },
    #     {
    #       "name": "Logs_20150930"
    #     }
    #   ]
    # ]

## 7.3.29.4. Parameters

This section describes parameters.

### 7.3.29.4.1. Required parameters

There is one required parameter.

#### 7.3.29.4.1.1. `logical_table`

Specifies the logical table name. `logical_shard_list` returns a list of shard name of the logical table:

Execution example:

    logical_shard_list --logical_table Logs
    # [
    #   [
    #     0,
    #     1337566253.89858,
    #     0.000355720520019531
    #   ],
    #   [
    #     {
    #       "name": "Logs_20150801"
    #     },
    #     {
    #       "name": "Logs_20150802"
    #     },
    #     {
    #       "name": "Logs_20150930"
    #     }
    #   ]
    # ]

The list is sorted by shard name in ascending order.

### 7.3.29.4.2. Optional parameters

There is no optional parameters.

## 7.3.29.5. Return value

The command returns a list of shard names in ascending order:

    [
      HEADER,
      [
        {"name": "SHARD_NAME_1"},
        {"name": "SHARD_NAME_2"},
        ...
        {"name": "SHARD_NAME_N"}
      ]
    ]

See Output format for `HEADER`.

## 7.3.29.6. See also

> - Sharding