Enqueue and dequeue in SAP ABAP
Enqueue - It is used to lock the database while updating the database. Because values are not overlapped. Dequeue - It is used to unlock the database after updating the database. In This scenario I am updating the date in database TVARVC. Report REPORT zab_rp_enqueue_dequeue . PARAMETERS : p_date TYPE sy - datum . CONSTANTS : g_c_po_date TYPE string VALUE 'ZAB_DATE1' . DATA ( lv_year ) = p_date+0 ( 4 ) . DATA ( lv_mon ) = p_date+4 ( 2 ) . DATA ( lv_date ) = p_date+6 ( 2 ) . CONCATENATE lv_year lv_mon lv_date INTO DATA ( lv_final ) . CALL FUNCTION ' ENQUEUE_E_TABLE ' EXPORTING mode_rstable = 'E' tabname = 'TVARVC' EXCEPTIONS foreign_lock = 1 system_failure = 2 OTHERS = 3 . IF sy - subrc = 0 . UPDATE tvarvc SET low = lv_final WHERE name = g_c_po_date . IF sy - subrc = 0 .