Database is a one of the important data models with different attributes that you can modify as per your requirements.
The following statement is the basic syntax of the Alter Database command.
ALTER DATABASE <attribute-name> <attribute-value>
Where <attribute-name> defines the attribute that you want to modify and <attribute-value> defines the value you want to set for that attribute.
The following table defines the list of supported attributes for altering a database.
| 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. |
Example
From the version of OrientDB-2.2, the new SQL parser is added which will not allow the regular syntax in some cases. Therefore, we have to disable the new SQL parser (StrictSQL) in some cases. You can use the following Alter database command to disable the StrictSQL parser.
orientdb> ALTER DATABASE custom strictSQL = false
If the command is executed successfully, you will get the following output.
Database updated successfully