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ALTER RESOURCE UNIT
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========================================
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描述
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-----------
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该语句用来修改资源单元配置。
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格式
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-----------
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```javascript
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ALTER RESOURCE UNIT unitname
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MAX_CPU [=] cpunum,
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MAX_MEMORY [=] memsize,
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MAX_IOPS [=] iopsnum,
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MAX_DISK_SIZE [=] disksize,
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MAX_SESSION_NUM [=] sessionnum,
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[MIN_CPU [=] cpunum,]
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[MIN_MEMORY [=] memsize,]
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[MIN_IOPS [=] iopsnum] ;
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```
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参数解释
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-------------
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| 参数 | 描述 |
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|-----------------|---------------------------------------------------|
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| MAX_CPU | 指定要修改的 CPU 最多数量 |
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| MAX_MEMORY | 指定要修改的最大内存容量,取值范围为\[1073741824, +∞) 单位为字节,即最小值为1G |
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| MAX_IOPS | 指定要修改的 IOPS 最多数量,取值范围为\[128,+∞) |
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| MAX_DISK_SIZE | 指定要修改的最大硬盘容量,取值范围为[536870912,+∞]单位为字节,即最小值为512M |
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| MAX_SESSION_NUM | 指定要修改的 session 最多数量,取值范围为\[64,+∞) |
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| MIN_CPU | 指定要修改的 CPU 最少数量 |
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| MIN_MEMORY | 指定要修改的最小内存容量 |
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| MIN_IOPS | 指定要修改的 IOPS 最少数量 |
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示例
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-----------
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* 修改资源单元 unit1 最高配置为 2个CPU,2G 的内存容量。
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```javascript
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OceanBase(admin@test)> ALTER RESOURCE UNIT unit1 max_cpu 2, max_memory '2G';
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Query OK, 0 rows affected (0.02 sec)
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```
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