CONCURREADONLY

CONCURREADONLY is a designation used in some database access libraries to specify a read-only cursor or result set. When a cursor is opened with this concurrency mode, the application is not allowed to update, insert, or delete rows through that cursor. The read-only setting can enable the database engine to apply optimizations such as reduced locking and simpler transaction handling, since updates are not anticipated.

In practice, CONCURREADONLY appears as a flag or constant passed to cursor or statement configuration APIs. It is typically one of several concurrency options, alongside updatable or lockable modes. The exact semantics can vary by API and database; some systems distinguish read-only at the cursor level, others at the result set or data access layer.

Because the terminology is not universal, implementations may vary in naming and behavior. Some libraries use a version of CONCURREADONLY that is split into words or formatted differently, and others expose equivalent concepts under different constants or enumerations. Developers should consult their specific API or database driver documentation to confirm how read-only concurrency is requested and what guarantees it provides.

See also:

- SQL_CONCUR_READ_ONLY

- ResultSet.CONCUR_READ_ONLY

- CONCUR_UPDATABLE

- Cursor concurrency concepts