OAM pages are used when performing a table scan on a data only locked (DOL) table. These OAM pages refer to allocation-units, which must then be scanned to find the extents on the pages for the table being scanned; when this scan is started, a list of pages is generated with the information in the allocation-page. Any newly allocated pages produced by another process in this allocation unit are not seen by the scanning process as they were not allocated when the scan began. This is due to the way DOL tables are implemented. To include the newly allocated pages:
Use isolation level 3 type of scans (select with holdlock) or,
add an index, which can be used to prevent a table scan, to the DOL-table, or,
Convert the DOL table to an APL-table.
