56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
---
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{
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"title": "SHOW ALTER",
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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 ALTER
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## description
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该语句用于展示当前正在进行的各类修改任务的执行情况
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语法：
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SHOW ALTER [CLUSTER | TABLE [COLUMN | ROLLUP] [FROM db_name]];
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说明：
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TABLE COLUMN：展示修改列的 ALTER 任务
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支持语法[WHERE TableName|CreateTime|FinishTime|State] [ORDER BY] [LIMIT]
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TABLE ROLLUP：展示创建或删除 ROLLUP index 的任务
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如果不指定 db_name，使用当前默认 db
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CLUSTER: 展示集群操作相关任务情况（仅管理员使用！待实现...）
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## example
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1. 展示默认 db 的所有修改列的任务执行情况
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SHOW ALTER TABLE COLUMN;
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2. 展示某个表最近一次修改列的任务执行情况
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SHOW ALTER TABLE COLUMN WHERE TableName = "table1" ORDER BY CreateTime DESC LIMIT 1;
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3. 展示指定 db 的创建或删除 ROLLUP index 的任务执行情况
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SHOW ALTER TABLE ROLLUP FROM example_db;
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4. 展示集群操作相关任务（仅管理员使用！待实现...）
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SHOW ALTER CLUSTER;
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## keyword
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SHOW,ALTER
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