63 lines
2.1 KiB
Markdown
63 lines
2.1 KiB
Markdown
---
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{
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"title": "ALTER DATABASE",
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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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# ALTER DATABASE
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## description
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该语句用于设置指定数据库的属性。（仅管理员使用）
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语法：
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1) 设置数据库数据量配额，单位为B/K/KB/M/MB/G/GB/T/TB/P/PB
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ALTER DATABASE db_name SET DATA QUOTA quota;
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2) 重命名数据库
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ALTER DATABASE db_name RENAME new_db_name;
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3) 设置数据库的副本数量配额
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ALTER DATABASE db_name SET REPLICA QUOTA quota;
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说明：
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重命名数据库后，如需要，请使用 REVOKE 和 GRANT 命令修改相应的用户权限。
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数据库的默认数据量配额为1024GB，默认副本数量配额为1073741824。
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## example
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1. 设置指定数据库数据量配额
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ALTER DATABASE example_db SET DATA QUOTA 10995116277760;
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上述单位为字节,等价于
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ALTER DATABASE example_db SET DATA QUOTA 10T;
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ALTER DATABASE example_db SET DATA QUOTA 100G;
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ALTER DATABASE example_db SET DATA QUOTA 200M;
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2. 将数据库 example_db 重命名为 example_db2
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ALTER DATABASE example_db RENAME example_db2;
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3. 设定指定数据库副本数量配额
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ALTER DATABASE example_db SET REPLICA QUOTA 102400;
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## keyword
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ALTER,DATABASE,RENAME
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