Internationalization: time zone settings

The SAP system can deal with multiple time zones. This blog will explain the settings.

Questions that will be answered are:

  • How can I check my current time zone settings in my SAP system?
  • How can I check and update time zone customizing settings?
  • If there is a time zone or day light saving change, in which note can I find which settings I should change?

Check the current time zone settings

The active time zone of your system can be checked via transaction STZAC:

Time zone customizing

Detailed time zone customizing settings can be made via transaction STZBC:

Changes that are needed to time zone settings (for example new change for daylight saving) can be found in the central OSS note 198411 – Current data and information about time zones.

Background information

More background information can be found on the SAP wiki on time zones.

S4HANA embedded livecache activation

In S4HANA you have a choice to activate the embedded livecache for SCM functionality. Or to keep your current SCM livecache in a separate system.

This blog will describe the steps to activate the SCM livecache embedded in S4HANA.

Questions that will be answered in this blog are:

  • How to activate the embedded S4HANA livecache technically?
  • How to monitor the embedded S4HANA livecache?
  • How to activate the embedded S4HANA livecache functionally?

Installation

First read the embedded livecache OSS note: 2593571 – FAQ: SAP HANA Integrated liveCache.

Then determine via OSS note 2074843 – Version Matrix for HANA integrated liveCaches, which exact version to download and install.

Then follow all the manual installation steps described in OSS note 2407589 – Manual installation of liveCache for S/4HANA.

Installation will take few hours, up to a few days (depends on your experience).

Technical checks

When you start LC10 transaction, like you are used to on an SCM server, you will be re-directed to DB50 or DBACOCKPIT transaction:

In DBACOCKPIT you can see the 3 schemas for Livecache:

And you can see all livecache related technical parts:

Functional activation

After the technical activation the functional activation has to be done in customizing for advanced planning and scheduling:

And separately for global ATP:

Functional testing

After the activation you can check to see all works by creation of new material in transaction MM01. The new tab Advanced Planning should be available now:

FIORI cache refresh

After update of a FIORI app UI5 code you will sometimes face issues that the browser or server still holds components from the old app version. This issue is there for both custom developed and for standard SAP UI5 apps. The root cause is the caching at multiple levels to assure highest performance. There are caches on frontend browser, gateway server and backend server.

Questions that will be answered are:

  • What do I need to do on the browser for refresh?
  • How do I clear the caches on the gateway frontend server?
  • How do I clear the caches on the backend server?

Browser cache refresh

After an update of the UI code best to clear the browser cache. In Chrome also: open the application in chrome and use key combination ctrl + shift + R to perform a hard reload.

Or run in Private or Incognito mode.

Best browser for testing is Chrome.

Gateway and backend server cache clearing

Use the following sequence to clear all caches:

1. Execute /IWBEP/CACHE_CLEANUP transaction in ECC system (or other backend system) as well as Gateway system.

2. Execute /IWFND/CACHE_CLEANUP transaction in Gateway system with checkbox checked.

3. In the gateway system, you need to do the below steps:

  • Goto transaction SMICM
  • Click on ‘Goto’ menu bar button
  • Select option ‘HTTP Plug-In’ Select option ‘Server Cache’
  • Select option ‘Invalidate Globally’

4. Execute report “/IWBEP/R_MGW_MED_CACHE_CLEANUP” in the back-end system and delete all the cached metadata.

5. Execute reports /UI2/INVALIDATE_GLOBAL_CACHES, /UI2/INVALIDATE_CLIENT_CACHES, /UI5/APP_INDEX_CALCULATE in front-end gateway system.

For the last program ( /UI5/APP_INDEX_CALCULATE) you can do a delta or full for all or for a specific application.

Note on the cache cleanup: 2319491 – How to clean up the cache after applying changes that affect SAP Fiori apps.

qRFC tips & tricks

This blog will give tips and trick on the basis part of qRFC (queued RFC).

Questions that will be answered are:

  • How to assign a specific server group to qRFC?
  • How to correct host ID in SMQS?
  • What to do with the scheduler error RES_LACK?
  • What to do when inbound entries in SMQ2 stay in status RETRY?

Assigning specific server group for qRFC

In RZ12 you have defined a specific server group. In SMQR or SMQS you can assign that server group with menu option Edit / Change AS group:

How to correct host ID in SMQS?

After a system copy the host ID in SMQS might be still pointing to the old system. To solve this, goto SM51 and select menu option Goto / Host Name Buffer / Reset / Entire System. Then go back to SMQS and re-activate the scheduler via menu option Edit / Activate Scheduler. See also OSS note 2377064 – How to correct the host ID in SMQS.

Outbound scheduler in status RES_LACK

If the outbound scheduler SQMS has the status RES_LACK, then the amount of DIA versus BTC processes is not balanced. Follow the instructions from OSS note 1970757 – Outbound qRFC scheduler with status RES_LACK to balance the processes.

Deletion of queued messages

Deletion of queued messages is possible, but should be done with care. After deletion, support can be lost on certain functions. See for example OSS note 2375304 – Deleted queues from SMQ2. You can apply OSS note 2837536 – Customer Connection – Improvement Request 217719 – Authorization check for message deletion in Smq2 / Smq3 to restrict the access to message deletion via special authorization object.

Inbound queues SMQ2 stay in status RETRY

When inbound entries in SMQ2 queue remain in status RETRY, this is normally caused by lack of authorization for launching batch job. This can happen to background user and user reprocessing the jobs. Check the authorization trace to see what needs to be fixed. More background in OSS note 1862256 – Inbound queues (SMQ2) stay in status RETRY.

Queue resets via batch jobs

Report RSQOWKEX can be used to reset the outbound queue. RSQIWKEX can be used to reset the inbound queue. The goal is to reprocess messages in error state like SYSFAIL, CPIERR. More details are in OSS note 2552322 – RSQOWKEX and RSQIWKEX. Note 2195856 – Double message execution explains to be careful with using these programs with status RETRY.

These programs can be scheduled in batch mode to automate reprocessing.

SWLT performance tuning worklist

This blog explains how to use the SWLT performance tuning worklist to find poorly performing Z code by combining SQL monitoring data from production and ATC results.

Questions that will be answered are:

  • How to setup the SWLT performance tuning worklist tool?
  • How to analyze the results from the SWLT performance tuning worklist tool?

Preparations

As preparation for the SWLT tool you must have run the SQL monitor in a productive system and created a snapshot of the data. This snapshot you can export and import in a development system. In the development system you configure and run the ATC code check tool.

The SWLT performance tuning worklist tool will combine these results. As example we will use this poorly written Z code:

Running the SWLT tool

Start transaction SWLT:

You can reduce the scope by just taking the needed Z packages. Goto the tab Static Checks to select the appropriate result of the ATC run:

Now select the SQL monitor tab to select your SQLM data snapshot you took from your productive system:

Now that all data is loaded, you can hit the execute button to start the SQL performance tuning worklist.

The tool will now start to merge the results. In the example above you can see the following result:

In the total result select a line. On the bottom left you can see the SQL monitor results. Bottom right you can see the ATC check result. Clicking on the underlined program or SQL statement will bring you to the poorly performing ABAP code point.

SQLM SQL monitor

This blog will explain about the SQLM tool to monitor expensive SQL statements in a productive environment.

Questions that will be answered are:

  • How to start and configure the SQLM tool?
  • How to analyze the results?

Configuration of SQLM tool

The SQLM tool does not require specific configuration or installation if you have a bit modern SAP system. To activate it start transaction SQLM and click on the Activate button for All Servers:

The trace is active now until the given time frame.

Example use of the SQLM transaction

First we start by writing a very bad performing Z program:

This program is really inefficient. After activation of the SQLM monitoring we run this program a few times.

Now we goto the SQLMD transaction (or from SQLM and then press display data button) to display the SQL monitoring results:

Selection can be done on total number of executions, execution time, amount of records. Result:

You see now the impact of our badly written program. Double click on the line will jump to the ABAP code point.

Creating snapshots

At the bottom of the SQLM start screen there are the buttons to create snapshots:

This results into the Snapshot screen:

You can create a snapshot here for later re-use. You can also download the snapshot to a different system by using these buttons: first export to file:

When you have the file, goto the target system and start SQLM and press create snapshot. Now use the option Create with Data Source File Import.

It is common practice to capture data in production by a basis administrator who exports it. Then the data download is handed over to an ABAP developer using the data as upload in SQLM database in the development system to improve poorly performing Z code. The developer can use the SWLT tool (see blog) to combine the SQLM data with the static code review data taken from the ATC tool (see blog).

Background information

More background information can be found in OSS note 1885926 – ABAP SQL monitor.

Useful blog (which is start of blog series on SQLM): link.

OSS notes

Relevant OSS notes:

Solution manager demo system

This blog will explain about the free available SAP solution manager 7.2 demo system.

Questions that will be answered are:

  • How can I access the free available SAP solution manager 7.2 system?

SAP solution manager 7.2 demo system

To promote the use of SAP solution manager 7.2 SAP has made a system available for everybody to test drive.

Follow this link to goto the main page. Then scroll down to the access link:

This will bring you to the launchpad by using one of the roles (with user ID and password on the site):

After logon you reach the launchpad, for that specific role (example here is Business Process Expert):

This will enable you to test drive the new functionality for Solution documentation:

This is just one of the examples. You can also test drive Focused Build and Focused Insights functionality. Both are free to use as of 1.1.2020 (see blog).

The system that SAP offers does have regular updates and resets of data. Read the SAP blog for the actual dates.

I18N internationalization

This blog will explain about the I18N internationalization transaction.

Questions that will be answered are:

  • How can I see which languages are installed in my system?
  • How is my system configured for internationalization?

Transaction I18N

Almost all internationalization topics in SAP are centrally maintainable from transaction I18N:

In the menu on the left you can select all the topics and tools. More background on the transaction itself can be found in OSS note 848036 – Transaction ‘I18N’ (Internationalization).

Installed languages

By selecting the installed languages tool you can see which languages are installed in your system and which ones are allowed for logon:

Current internationalization configuration

By selecting the troubleshooting tool Current I18N system configuration, you can list all the related current system settings:

Webservice message monitoring

This blog will explain about webservice message monitoring.

Questions that will be answered are:

  • How can I display webservice messages?
  • How can I set the deletion retention timing for webservice messages?

This blog assumes that you have correctly activated the basic SOAP webservice runtime. See separate blog on this topic.

Webservice message monitoring

You can start the webservice message monitoring with transaction SRT_MONI. In the selection screen fill out filtering parameters are per need:

Result will look like:

By clicking on the message itself you can see the content in XML format.

Setting retention period of webservice message deletion

Webservice messages will get deleted automatically in the SAP system. The default value is one week. You might need to keep the messages longer. The setting that controls this retention period is quite hidden. To change the setting, you need to start transaction SXMB_ADM and then select the option Schedule Delete Jobs:

Then you change the retention settings as per need:

SAP buffers and buffer refreshes

This blog will explain the SAP buffer setup and the SAP buffer refresh process.

Questions that will be answered are:

  • What is the use of table buffers?
  • Which tables are buffered?
  • How to force a buffer refresh in general?
  • How to force a buffer refresh for a specific table?
  • How to force a buffer refresh on a specific application server?

Background of table buffers

The primary reason of a table buffer is pretty simple: performance improvement.

SAP has a 3 tier setup of:

  1. Front end GUI
  2. Application server
  3. Database server

If data is read from the database server it is processed on the application server. This data is buffered on the application server. If a user asks the same data twice, the application server already has the data. Also very frequently read tables (like company code and plant data) are buffered on the application server.

In transaction SE11 in the technical settings of a table you can see if a specific table is buffered or not, and the type of buffering. Example is for table T000, which is fully buffered:

When to set buffering?

Buffering is extremely useful on small and infrequently changing tables, which have a lot of read access. For these tables buffering will help a lot. That is why a lot of customizing table have buffering activated. You can do the same for your Z tables if they are used for customizing like purposes.

How to reset table buffers?

In some specific case you might want to force a buffer reset.

For this reason you can enter specific commands (enter same way like transaction code or the famous /h for debugging):

/$TAB – Resets all the table buffers on the application server

/$TAB <table name> – Resets the TABLE buffers on the application server for that specific table

/$SYNC Resets the buffers on the application server

/$CUA Resets the CUA buffer of the application server (the CUA buffer is not for central user admin, but holds screen elements like menus, buttons, etc)

/$DYN Resets the screen buffer on the application server

/$ESM Resets the exp/imp shared memory Buffer on the application server

/$PXA Resets the program (PXA) buffer on the application server

/$OBJ Resets the shared buffer of the application server

Other buffer and caching resets

There are other buffer and caching resets:

  • User buffer reset: goto transaction SU53 and select menu Authorization Values / Reset User Buffer
  • User role combination refresh: transaction PFUD, see dedicated blog.
  • FIORI buffers, see dedicated blog.