APQD is a standard SAP Table which is used to store DATA DEFINITION Queue data in SAP systems, such as SAP R/3, S/4HANA, depending on the version and release level.
The APQD table consists of various fields, each holding specific information or linking keys about DATA DEFINITION Queue data available in SAP. These include TRANS (Transaction counter: Batch input, statistics), BLOCK (Message counter: Batch input, statistics), SEGMT (Queue data segmentation number), MSGCOUNT (Queue data block number)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .