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/READONLY is a Type 3, JDBC connect string parameter. If you pass /READONLY=YES, connections to the backend database will prohibit updates to that database. In other words, select statements are the only statements, which you may run. If you pass /READONLY=NO, you will have READ/WRITE access to that database, unless serverside settings exclude this.
Example: /READONLY = NO
See Also: JDBC, Type 3