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The SysLog is an acronym for “System Logging”. Selected events and problems within a SAP® system are generally logged.
The information ar written into textfiles that are saved on the operation system level. The exact location can be identified
with the help of the system parameter DIR_LOGGING. Call the transaction SA38, and enter the repoprt name RSPFPAR,
push the key F8. Enter the parameter name, and activate the execution via F8.

The name of the local file can be identified with the help of the parameter rslg/local/file. The cross-client information are written
sequentially into this file until the maximum file size is reached. The size is controlled via the parameter rslg/max_diskspace/local.
When the maximum limit is reached a new file will be created, and the old file will be saved as copy. This copy can be identified
with the help of the parameter rslg/local/old_file.

SAP® only saves one copy at a time. That means if the new file has reached the maximum size, it will be saved as a copy,
and with this, the former copy will be overwritten. A system log is written for every instance. If you run on multiple instances
you have to make sure that you look up all corresponding log information. UNIX systems allow a central logging in that way,
that the locally safed information can be send to a central instance [parameter rslg/central/file]. For evaluation of the records,
please call the transaction SM21 [the report RSLG0001 can be used as equivalent]. To check all remote instances at the same
time [which is to be preferred due to efficiency] you have to select the menu path:
System log – Choose - All remote system logs , Select then the menu path: Edit – Expert mode.

 

 

 

You can modify the layout via the menu path

 Goto – Layout:

 

 

The required authorizations for the evaluation are S_TCODE with TCD value SM21 S_ADMI_FCD with S_ADMI_FCD value SM21

 

The following events, and messages are important for audit and security reviews, and can be selected via the integrated
button Message IDs.

 

You can get the full scope of possible entries by calling the table TSL1D via transaction SE16N.

A19 allows to review if a field content was changed in debug mode e.g., which is not allowed in a production environment.
Together with the entries in A14 you can even evaluate with which program, and which line.With BXF you can see if the
table logging was deactivated in a program by a user. GEW shows if the authorization check for the lock management via
SM12 was deactivated.LC0 displays if a user has executed logical os commands.F04 provides the information about deletion 
of DB tables. R0L allows you to see if a program was set to debug mode by a user. R0S displays manually inactivation of the
update, R0T the manual activation, and R0U shows if an update request was deleted. With R0W you can see if a terminated
update was reposted. With R0Y you can show that terminated updates were diyplayed with SM13. And R65 shows, that an
update was terminated. US2 shows if the user SAP* was deleted, and by whom.AUP which transaction was locked, and
with AUQ you can also see if, and which transaction was unlocked. With AUE to AUI you can keep track of changes to
the audit configurations of the Security Audit Log.In the log, you can call the detail view via double click onto a selected entry.


Important note:
Please make sure that the access to the log files on the os level is restricted, and that the files are properly protected 
against unathorized manipulations, or even deletion.