Delete Vertex command is used to remove vertices from the database. While deleting, it checks and maintains the consistency with the edges and removes all cross-references (with the edges) to the deleted vertex.
The following statement is the basic syntax of Delete Vertex Command.
DELETE VERTEX <vertex> [WHERE <conditions>] [LIMIT <MaxRecords>>] [BATCH <batch-size>]
Following are the details about the options in the above syntax.
<vertex> − Defines the vertex that you want to remove, using its Class, Record ID, or through a sub-query.
WHERE − Filters condition to determine which records the command removes.
LIMIT − Defines the maximum number of records to be removed.
BATCH − Defines how many records the command removes at a time, allowing you to break large transactions into smaller blocks to save on memory usage.
Example
Try the following command to learn how to delete single vertex or multiple vertices.
Execute the following command to remove the vertex ‘#14:1’.
orientdb> DELETE VERTEX #14:1
If the above command is executed successfully, you will get the following output.
Delete record(s) '1' in 0.005000 sec(s)
Execute the following command to remove all vertices from the class ‘Customer’ marked with the property ‘isSpam’.
orientdb> DELETE VERTEX Customer WHERE isSpam = TRUE
If the above command is executed successfully, you will get the following output.
Delete record(s) '3' in 0.005000 sec(s)