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達(dá)夢(mèng)數(shù)據(jù)庫(kù)常用命令概述

達(dá)夢(mèng)數(shù)據(jù)庫(kù)（DMDB）是一款高性能、高可靠、易管理的國(guó)產(chǎn)數(shù)據(jù)庫(kù)，廣泛應(yīng)用于政府、金融、電信、能源等行業(yè)。本文將為您介紹達(dá)夢(mèng)數(shù)據(jù)庫(kù)的一些常用命令，幫助您快速上手。

一、數(shù)據(jù)庫(kù)相關(guān)命令

1. 查詢實(shí)例信息

```sqlSELECT ame, isame FROM visace;```

2. 查詢授權(quán)截止有效期

```sqlSELECT EXPIREDDATE FROM vlicese;```

3. 查詢數(shù)據(jù)庫(kù)最大連接數(shù)

```sqlSELECT SFGETPARAVALUE(2, 'MAXSESSIOS');```

4. 查看密碼策略

```sqlSELECT FROM vdmii a WHERE a.PARAAME = 'PWDPOLICY';```

5. 查看每個(gè)用戶的密碼策略

```sqlSELECT userame, passwordversios, accousaus FROM dbausers;```

二、表空間相關(guān)命令

1. 查詢表空間大小

```sqlSELECT FILEAME, FILEID, TABLESPACEAME, BYTES/1024/1024 'M' FROM dbadaafiles;```

2. 創(chuàng)建表空間

```sqlCREATE TABLESPACE ablespace_ameDATAFILE 'file_pah' SIZE 100MAUTOEXTED O EXT 10M MAXSIZE ULIMITED;```

3. 刪除表空間

```sqlDROP TABLESPACE ablespace_ame;```

三、用戶相關(guān)命令

1. 查詢數(shù)據(jù)庫(kù)用戶信息

```sqlSELECT userame, userid, defaulablespace, profile FROM dbausers;```

2. 創(chuàng)建用戶

```sqlCREATE USER user_ame IDETIFIED BY passwordDEFAULT TABLESPACE ablespace_ameQUOTA ULIMITED O ablespace_ame;```

3. 刪除用戶

```sqlDROP USER user_ame;```

四、權(quán)限相關(guān)命令

1. 查看用戶的角色和權(quán)限

```sqlSELECT FROM SYS.DBAROLEPRIVS;```

2. 授予權(quán)限

```sqlGRAT SELECT O able_ame TO user_ame;```

3. 撤銷權(quán)限

```sqlREVOKE SELECT O able_ame FROM user_ame;```

五、數(shù)據(jù)表相關(guān)命令

1. 查看數(shù)據(jù)表結(jié)構(gòu)

```sqlDESCRIBE able_ame;```

2. 創(chuàng)建數(shù)據(jù)表

```sqlCREATE TABLE able_ame ( colum1 colum_ype colum_opio, colum2 colum_ype colum_opio, ...);```

3. 刪除數(shù)據(jù)表

```sqlDROP TABLE able_ame;```

4. 修改數(shù)據(jù)表

```sql-- 重命名表ALTER TABLE old_able_ame REAME TO ew_able_ame;-- 添加新字段ALTER TABLE able_ame ADD colum_ame colum_ype colum_opio;-- 修改字段ALTER TABLE able_ame CHAGE old_colum_ame ew_colum_ame colum_ype colum_opio;-- 刪除字段ALTER TABLE able_ame DROP COLUM colum_ame;```

六、數(shù)據(jù)操作相關(guān)命令

1. 查詢數(shù)據(jù)

```sqlSELECT FROM able_ame;```

2. 插入數(shù)據(jù)

```sqlISERT ITO able_ame (colum1, colum2, ...) VALUES (value1, value2, ...);```

3. 更新數(shù)據(jù)

```sqlUPDATE able_ame SET colum1 = value1, colum2 = value2, ... WHERE codiio;```

4. 刪除數(shù)據(jù)

```sqlDELETE FROM able_ame WHERE codiio;```

七、其他常用命令

1. 查看數(shù)據(jù)庫(kù)版本

```sqlSELECT FROM vdaabase;```

2. 查看數(shù)據(jù)庫(kù)狀態(tài)

```sqlSELECT saus FROM visace;```