* OPEN ALLOWING READERS is not supported by Informix. You determine in your runtime configuration file how this phrase will be interpreted. Set the variable STRENGTHEN-LOCKS to 1 (one) to cause this phrase to be treated as OPEN ALLOWING NO OTHERS. Set the variable to 0 (zero) to cause the phrase to be treated as OPEN ALLOWING ALL. The default value is 0.
* Only single-record locking is supported, unless the program is within a transaction.
* If you attempt to REWRITE a record that contains a SERIAL data type, you will receive an Informix error. You might want to change SERIAL fields to SMALLINT, as we do for the orders table in the demonstration .
* Informix does not support record encryption, record compression, or alternate collating sequences. You may include these options in your program; they will be disregarded if they are specified.
* The ACUCOBOL-GT utility program vutil cannot be used with Informix files. Instead, use utilities supplied by Informix.
* Whenever you are using the library routine RENAME, you must specify that you are using indexed files. This information is passed by the value I in the fourth parameter. If you want to delete an Informix table with the DELETE FILE verb, make sure the verb references an indexed file.