Table of Contents
- 1 How often does SAP HANA create a savepoint?
- 2 What is the purpose of SAP HANA parameters?
- 3 What is Delta storage in SAP HANA?
- 4 What is Delta storage in HANA?
- 5 How can I tell if Hana parameter is dynamic?
- 6 What is RTO and RPO in SAP HANA?
- 7 How does SAP HANA persist in-memory data?
- 8 What is the role of the savepoint coordinator?
How often does SAP HANA create a savepoint?
every five minutes
In SAP HANA database, changed data is automatically saved from memory to disk and at the interval on which it is saved is called savepoints and by default they are set to occur every five minutes.
What is Delta merge in SAP HANA?
Delta Merge: Delta merge is a process of moving data from delta area to main area called as delta merges. The purpose of the delta merge operation is to move changes collected in the delta storage to the read-optimized main storage.
What is the purpose of SAP HANA parameters?
1. What is the purpose of SAP HANA parameters? SAP HANA parameters are configuration options that can be used to influence the behavior of SAP HANA in various ways.
What is point in time recovery in SAP HANA?
Point in Time Recovery used in the HANA database for recovering database to the specific point in time. For this recovery, the data backup and log backup have to be available since last data backup and log area are required to perform the above type recovery.
What is Delta storage in SAP HANA?
The column store is the part of the SAP HANA database that manages data organized in columns in memory. Instead, all changes are written to a separate data structure called the delta storage . The delta storage uses only basic compression and is optimized for write access.
What are the services in Hana database?
Main Servers
Server Component | OS Process | Service Name |
---|---|---|
SAP HANA Deployment Infrastructure (HDI) server | hdbdiserver | diserver |
XS classic server | hdbxsengine | xsengine |
Extended store server | hdbesserver | esserver |
Data provisioning server | hdbdpserver | dpserver |
What is Delta storage in HANA?
What is global ini in SAP HANA?
ini) ini file stores global configuration properties for each service in the landscape. …
How can I tell if Hana parameter is dynamic?
find if a parameter is dynamic in HANA
- open cdexe on the OS side, if you already configured this alias.
- otherwise go to the folder “cd /usr/sap/$SAPSYSTEMNAME/SYS/exe/hdb”
- open the config folder by command “cd config”
- open the Master ini files you need with the editor (do not adjust value in these files)
How do I refresh DB in Hana?
HANA DB refresh/copy using Point in Time Recovery option
- Copy Backups (Data and at-least 1 log backup) from source to target server.
- Create backup catalog in target DB with backup files from Source DB.
- Recover Target DB.
What is RTO and RPO in SAP HANA?
The RPO is the maximal permissible period of time during which operational data may be lost without ability to recover (time between the last backup and the crash) • The RTO is the maximal permissible time it takes to recover the system, so that its operations can resume.
What is the SAP HANA savepoint mechanism?
SAP HANA Savepoint Mechanism – Internal stages. SAP HANA persists in-memory data by using savepoints. Each SAP HANA service has its own separate savepoints. During a savepoint operation, SAP HANA database flushes all changed data from memory to the data volumes.
How does SAP HANA persist in-memory data?
SAP HANA persists in-memory data by using savepoints. Each SAP HANA service has its own separate savepoints. During a savepoint operation, SAP HANA database flushes all changed data from memory to the data volumes.
What is the difference between a savepoint and a log?
The data belonging to a savepoint represents a consistent state of the data on disk and remains so until the next savepoint operation has completed. Redo log entries are written to the log volumes for all changes to persistent data.
What is the role of the savepoint coordinator?
The savepoint coordinator triggers writing of all these pages and waits until the I/O operations are complete. Phase 2 (CRITICAL): The is the critical part of a savepoint operation where no concurrent write operations are allowed. This is achieved using the consistent change lock.