65ff464e3d
Currently, the `show data` does not support sorting. When the number of tables increases, it is inconvenient to manage. Need to support sorting like: ``` mysql> show data order by ReplicaCount desc,Size asc; +-----------+-------------+--------------+ | TableName | Size | ReplicaCount | +-----------+-------------+--------------+ | table_c | 3.102 KB | 40 | | table_d | .000 | 20 | | table_b | 324.000 B | 20 | | table_a | 1.266 KB | 10 | | Total | 4.684 KB | 90 | | Quota | 1024.000 GB | 1073741824 | | Left | 1024.000 GB | 1073741734 | +-----------+-------------+--------------+ ```
114 lines
3.8 KiB
Markdown
114 lines
3.8 KiB
Markdown
---
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{
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"title": "SHOW DATA",
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"language": "zh-CN"
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}
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---
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<!--
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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-->
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# SHOW DATA
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## description
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该语句用于展示数据量、副本数量以及统计行数。
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语法：
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```
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SHOW DATA [FROM db_name[.table_name]] [ORDER BY ...];
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```
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说明：
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1. 如果不指定 FROM 子句，则展示当前 db 下细分到各个 table 的数据量和副本数量。其中数据量为所有副本的总数据量。而副本数量为表的所有分区以及所有物化视图的副本数量。
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2. 如果指定 FROM 子句，则展示 table 下细分到各个物化视图的数据量、副本数量和统计行数。其中数据量为所有副本的总数据量。副本数量为对应物化视图的所有分区的副本数量。统计行数为对应物化视图的所有分区统计行数。
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3. 统计行数时，以多个副本中，行数最大的那个副本为准。
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4. 结果集中的 `Total` 行表示汇总行。`Quota` 行表示当前数据库设置的配额。`Left` 行表示剩余配额。
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5. 如果想查看各个 Partition 的大小，请参阅 `help show partitions`。
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6. 可以使用 ORDER BY 对任意列组合进行排序。
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## example
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1. 展示默认 db 的各个 table 的数据量，副本数量，汇总数据量和汇总副本数量。
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```
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SHOW DATA;
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```
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```
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+-----------+-------------+--------------+
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| TableName | Size | ReplicaCount |
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+-----------+-------------+--------------+
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| tbl1 | 900.000 B | 6 |
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| tbl2 | 500.000 B | 3 |
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| Total | 1.400 KB | 9 |
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| Quota | 1024.000 GB | 1073741824 |
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| Left | 1021.921 GB | 1073741815 |
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+-----------+-------------+--------------+
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```
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2. 展示指定 db 的下指定表的细分数据量、副本数量和统计行数
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```
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SHOW DATA FROM example_db.test;
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```
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```
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+-----------+-----------+-----------+--------------+----------+
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| TableName | IndexName | Size | ReplicaCount | RowCount |
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+-----------+-----------+-----------+--------------+----------+
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| test | r1 | 10.000MB | 30 | 10000 |
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| | r2 | 20.000MB | 30 | 20000 |
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| | test2 | 50.000MB | 30 | 50000 |
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| | Total | 80.000 | 90 | |
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+-----------+-----------+-----------+--------------+----------+
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```
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3. 可以按照数据量、副本数量、统计行数等进行组合排序
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```
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SHOW DATA ORDER BY ReplicaCount desc,Size asc;
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```
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```
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+-----------+-------------+--------------+
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| TableName | Size | ReplicaCount |
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+-----------+-------------+--------------+
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| table_c | 3.102 KB | 40 |
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| table_d | .000 | 20 |
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| table_b | 324.000 B | 20 |
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| table_a | 1.266 KB | 10 |
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| Total | 4.684 KB | 90 |
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| Quota | 1024.000 GB | 1073741824 |
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| Left | 1024.000 GB | 1073741734 |
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+-----------+-------------+--------------+
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```
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## keyword
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SHOW,DATA
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