Program Execution Area. Memory for managing the fixed data of an ABAP program while it is being executed. The PXA notably contains the byte codes of all programs running concurrently at a specific time on an AS Instance. This memory is shared by all internal sessions of the AS Instance and there is only one such memory on each server. The byte code of a program that is executed once remains buffered in the PXA as a program load for as long as possible to prevent the data being reloaded from the database if the program is executed again. Furthermore, the PXA buffers shared resources, such as values of constants, and enables initial value sharing in boxed components.