SQL - CREATE SEQUENCE

Creates a new sequence. Command introduced in version 2.2.

Syntax

CREATE SEQUENCE <sequence> TYPE <CACHED|ORDERED> [START <start>] 
[INCREMENT <increment>] [CACHE <cache>]
  • <sequence> Logical name for the sequence to cache.
  • TYPE Defines the sequence type. Supported types are,
    • CACHED For sequences where it caches N items on each node to improve performance when you require many calls to the .next() method. (Bear in mind, this may create holes with numeration).
    • ORDERED For sequences where it draws on a new value with each call to the .next() method.
  • START Defines the initial value of the sequence.
  • INCREMENT Defines the increment for each call of the .next() method.
  • CACHE Defines the number of value to pre-cache, in the event that you use the cached sequence type.
  • CYCLE Defines if sequence will restart from START value after LIMIT value reached. Default value is FALSE.
  • LIMIT Defines limit value sequence can reach. After limit value is reached cyclic sequences will restart from START value, while non cyclic sequences will throw message that limit is reached.
  • ASC | DESC Defines order of the sequence. ASC defines that next sequence value will be currentValue + incrementValue, while DESC defines that next sequence value will be currentValue - incrementValue (assuming that limit is not reached). Default value is ASC.

Examples

  • Create a new sequence to handle id numbers:

    orientdb> CREATE SEQUENCE idseq TYPE ORDERED

  • Use the new sequence to insert id values

    orientdb> INSERT INTO Account SET id = sequence('idseq').next()

For more information, see