Edit backup and recovery is controlled by two edit recovery tables. Table ISREDRT is used for PDF edit without the Edit Interface (EDIF) service. Table ISREIRT is used for PDF edit with the EDIF service. A copy of the tables is automatically saved in each user's profile library. The number of entries (rows) in each table controls the number of recursion levels supported for backup and recovery. CLIST ISREDRTI or ISREIRTI for the EDIF service, builds the edit recovery table (aaaaEDRT, where aaaa is the ZAPPLID) the first time edit recovery is used for a given user and application ID.

The default table allows eight levels of recursion. After the table is built, you can execute CLIST ISREDRTS or ISREIRTS for the Edit Interface service to display it. To change the default size of the table, change the ‘SET N = ’ statement in CLIST ISREDRTI or ISREIRTI to any number from 1 to 99.

When a user enters Edit mode and recovery mode is on, or when a user attempts to turn on recovery mode, Edit automatically allocates a recovery data set if there is an unused entry in the edit recovery table. The edit recovery data set name is generated and placed in the table. The names generated are ZPREFIX.ZUSER.AAAAxxxx.BACKUP, (where AAAA is the application ID and xxxx is a 4-digit number between 0000 and 9999) if ZPREFIX and ZUSER are different, and ZUSER.AAAAxxxx.BACKUP if ZPREFIX and ZUSER are the same.

The edit interface recovery table contains data set names with a last qualifier of BACKUPI instead of BACKUP. These data set names are passed to the data set name change exit, if one exists, and the installation can change the names, if desired. Whenever the data set name change exit changes the recovery data set name, the PDF-generated recovery data set name is deleted and reused. The data set name change exit should check the recovery table and generate a unique data set name. The modified name is placed in the recovery table. If there is no unused entry, a message is displayed indicating recovery mode is not available. The user can continue editing with recovery mode off.

When you enter Edit, the edit profile controls the initial setting of recovery mode. When you terminate Edit, the system automatically deletes the recovery data set and frees the corresponding entry in the edit recovery table.

These restrictions apply to edit recovery data sets:

• They must be allocated as sequential data sets of record format U.
• They cannot be striped, or striped and compressed data sets.
• They cannot be multivolume data sets.

Edit recovery will not delete edit recovery data sets listed in the edit recovery table when the table has a disposition field set to 'K' associated with the recovery data set name. This is an obsolete facility for preallocating edit recovery files or enforcing naming conventions for edit recovery files. Instead, use the data set name change exit for this purpose.