📅 最后修改于: 2020-11-26 05:16:27 🧑 作者: Mango
数据库是具有不同属性的重要数据模型之一，您可以根据需要对其进行修改。
以下语句是Alter Database命令的基本语法。
ALTER DATABASE
其中
下表定义了用于更改数据库的受支持属性的列表。
| Sr.No. | Attribute Name | Description |
|---|---|---|
| 1 | STATUS | Defines the database’s status between different attributes. |
| 2 | IMPORTING | Sets the importing status. |
| 3 | DEFAULTCLUSTERID | Sets the default cluster using ID. By default it is 2. |
| 4 | DATEFORMAT | Sets the particular date format as default. By default it is “yyyy-MM-dd”. |
| 5 | DATETIMEFORMAT | Sets the particular date time format as default. By default it is “yyyy-MM-dd HH:mm:ss”. |
| 6 | TIMEZONE | Sets the particular time zone. By default it is Java Virtual Machine’s (JVM’s) default time zone. |
| 7 | LOCALECOUNTRY | Sets the default locale country. By default it is JVM’s default locale country. For example: “GB”. |
| 8 | LOCALELANGUAGE | Sets the default locale language. By default it is JVM’s default locale language. For example: “en”. |
| 9 | CHARSET | Sets the type of character set. By default it is JVM’s default charset. For example: “utf8”. |
| 10 | CLUSTERSELECTION | Sets the default strategy used for selecting the cluster. These strategies are created along with the class creation. Supported strategies are default, roundrobin, and balanced. |
| 11 | MINIMUMCLUSTERS | Sets the minimum number of clusters to create automatically when a new class is created. By default it is 1. |
| 12 | CUSTOM | Sets the custom property. |
| 13 | VALIDATION | Disables or enables the validations for entire database. |
从OrientDB-2.2版本开始，添加了新的SQL解析器，该解析器在某些情况下将不允许常规语法。因此，在某些情况下，我们必须禁用新的SQL解析器(StrictSQL)。您可以使用以下Alter database命令禁用StrictSQL解析器。
orientdb> ALTER DATABASE custom strictSQL = false
如果命令执行成功，您将获得以下输出。
Database updated successfully