Executables, Difference between Central and Local (SAP Library

Executables, Difference Between Central and Local

After a standard installation, you can do the following:

Putting the central storage for the executables on a central server. The executables can be used commonly through distributed instances over the network (NFS).

Advantages

Disadvantages

You need to provide storage for executables only once, on a central system in your network.

If the executables are changed, all the instances are automatically provided with the correct executables are a restart.

Startup of instances is slow because executables have to be loaded across the network rather than from local disk storage.

Central storage can result in workload problems that lower performance.

If the hosts of distributed R/3 instances run out of memory, then they must page active executables over the network. This can result in heavy workloads on the network and on the central system where the executables are stored.

Putting local storage of executables in distributed SAP instances while using automatic adjustment.
If the executables were updated in the central directory, each SAP instance updates its executables when the system starts up.

With this procedure, you can specify for each instance, if it takes part in the automatic executable adjustment, or if it works with its local executables.

SAP recommends storing executables locally if the host systems in your network have adequate disk storage. To store SAP executables locally, a host system must have several hundred MB of free disk storage (depending on the SAP Release).

Note

Not all of your R/3 instances must use local executables. You can create a "mixed" configuration in which the executables are stored locally only on certain host systems. The host systems with less memory space then access the central executables.

Caution

If the prerequisites for the automatic executable adjustment are only partially met, or not at all, the executables are not automatically kept at the same release level on the various instances. If you upgrade your system, or import Hot Packages, you risk forgetting to update your executables on the individual dialog instances.