Instances: Setup, Parameters & Operations

Why does a parameter changed online via RZ11 revert after a restart, and how do you make it permanent?

What are the two steps to save profile changes in RZ10, and when do they take effect?

When switching operation modes, how does the dispatcher handle idle vs busy WPs?

When the same parameter appears in both the default and instance profiles, which wins, and which kind of parameter belongs only in the default?

Why should instance number 89 be avoided on Windows?

What is an operation mode, and what problem does it solve?

What are the two timetables for operation modes, and which transaction maintains them?

What are the value-evaluation orders for static vs dynamic parameters?

What do the DO_NOT_TOUCH... files in the HANA datafile/log directories mean?

What are the SAP Host Agent's HTTP/HTTPS ports, and what is special about them?

Which command validates a profile and estimates memory requirements at the OS level?

What are the standard port numbers for the HANA daemon and nameserver (SYSTEMDB) (xx = instance number)?

On Linux/UNIX, what are each SAP system's OS user and primary group, and what is the sapinst group for?

Can startsap/stopsap still be used on Linux? What is used now to start/stop instances?

Which directory is the SAP Host Agent installed in, and why does the path contain no SID?

What are the port numbering rules for an ABAP instance's dispatcher, gateway, and message server?

What are the four steps to configure an operation mode in RZ04?

What is the RSPARAM report used for?

Roughly how many SAP parameters are there, and are the names case-sensitive?

What fixed characteristic does stopping a HANA tenant database have, and what command is used?

What are RZ10's three maintenance modes, and which is the most used?

In sapcontrol GetProcessList, what do GREEN, YELLOW, and GRAY mean?

Which executable is the SAP Start Service, and what tool calls it?

Which sapcontrol functions start/stop the whole system, a single instance, and stop the service?

What must you do before starting an instance with sapcontrol, and what happens if you don't?

GetProcessList does not show work processes — how do you see WPs at the OS level?

What starts/stops the whole HANA system from the command line, and what is its limitation?

What happens to the old developer trace when an instance stops, and how many generations are kept?

Which kind of RFC/session does SMLG vs RZ12 manage?

Why must a few SAP kernel files be owned by root? Give an example.

Where are almost all of HANA's files, and what is in /usr/sap/<HSID>?

Can dynamic/standby WPs be started/stopped manually? Between standby and dynamic, which does SAP recommend?

What does the work directory under an instance directory /usr/sap/<SID>/<instance> hold?

What is the difference between an SAP system's soft shutdown and hard shutdown?

What are the defaults of the three commonly-changed quotas in RZ12 (Max. No. of Logons / Separate Logons / WPs used)?

What is a dynamically started work process, and how is the maximum number calculated?

Which work process does asynchronous RFC run in, and why is quota control needed?

What are the three FavTyp methods for picking a favorite (B, R, W), and which is the recommended default?

On Linux, what is the startup chain from sapstartsrv to the instance's main process?

What type is a restricted/standby work process, which parameter sets its count, and what is the default?

What do SAP's two OS users on Windows do, and when is a domain install required?

Which transaction displays any parameter's current value and documentation online, and what condition allows changing it online?

When maintaining profiles with RZ10, what must the first step after installation be, and why?

Why use a logon group instead of connecting users directly to one instance for load balancing?

What is the most important trace for troubleshooting an instance, and what are the trace file names for the dispatcher and work processes?

What are developer trace levels 0–3, and why must you never set 0?

What is the typical use case for the dpmon tool?

What is special about the sharing scope of /usr/sap/trans, and which parameter sets its path?

What constraints apply when switching between operation modes (total count, SPO, BTC A)?

What do the global, profile, and exe subdirectories under /sapmnt/<SID> hold?

Which two files are exported when a change request is released, and what does each hold?

What are SAP's two top-level directories on Linux/UNIX, and how do they differ in sharing?

What are the two levels of profile files, and what is the default profile's file name?

How is the local kernel (exe) in an instance directory synchronized from the central kernel?

Which aliases let <sid>adm switch to the dialog instance directory, the ASCS instance directory, global, and profile?

Which two Linux distributions does the S/4HANA application server support, and which UNIX is the only one supported?

Where are HANA parameters stored, and how does that differ from an ABAP instance profile?

What is in the /usr/sap/<SID>/SYS directory, and what is its purpose?

Which transaction configures logon groups, and what is the default implicit group called?

Which tool checks the supported platform/version combinations for an SAP product, and why doesn't the book hardcode version numbers?