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Programming Interfaces
Data Management : Database Access : Sequences : Choosing between sequences and control tables : Storage limits
Storage limits
The number of sequence objects you can maintain at a time depends on the database block size (250 sequence objects per 1K of database block size). If you need to maintain more sequences, you must either increase the database block size or add another database to define more sequences or us a control table to generate incremental values in your application. The number of incremental fields you can maintain in a control table is limited only by the number of integer fields you can store in the table.