What is delta log in SAP HAN - SAP HANA?

SAP Term: delta log

• Component: HAN

• Component Name: SAP HANA

• Description: SAP A Log created by the column store containing entries for all operations executed on the delta storage. The delta log is used to rebuild the delta storage after a system restart. This is necessary because the delta storage structure of the column store exists only in memory and is not persisted to disk.

Smart SAP Assistant

• Key Concepts: 
  Delta log is a feature of SAP HANA that allows for the efficient storage and retrieval of data. It stores only the changes made to data, rather than the entire dataset, which reduces the amount of storage space needed. This makes it ideal for applications that require frequent updates to data.
  
  How to use it: 
  Delta log can be used to store and retrieve data in SAP HANA. To use it, you must first enable delta logging in the system settings. Once enabled, any changes made to data will be stored in the delta log. This allows for efficient retrieval of data when needed.
  
  Tips & Tricks: 
  When using delta log, it is important to ensure that the system settings are configured correctly. This will ensure that only the necessary changes are stored in the delta log and that no unnecessary data is stored. Additionally, it is important to regularly check the delta log for any errors or inconsistencies.
  
  Related Information: 
  Delta log is related to other features of SAP HANA such as column store and row store. Column store is used for storing large amounts of data while row store is used for storing smaller amounts of data. Additionally, delta log can be used in conjunction with other features such as replication and backup/restore.