Be aware that this is no actualĭefragmentation, so the allocated disk size won't reduce (see "Can No longer required persistence areas (e.g.
Therefore version consolidation is typically no issue in column store.Īllocated memory areas are cleaned in order to make more memory available for other purposes. Implicitly take care for a cleanup of no longer required versions. Happen when significant changes are executed against tables and Merges and reclaims of delta storage (SAP Note 2057046) and compression optimizations (SAP Note 2112604) In a table, it can indicate the necessity of version consolidation. UDIV values is significantly larger than the number of (current) records In column store both current and old versions of recordsĪre identified via unique document ID vectors (UDIV). Required consistent read versions of data. In order to avoidĬonsolidation". Garbage collection in column store refers to the cleanup of no longer Misunderstandings, it is better to name this activity "version Longer required consistent read versions of data. In order to avoid Garbage collection in the row store refers to the cleanup of no This SAP Note we will use the following naming conventions whenĭiscussing different kinds of garbage collection: Unprecise, because it can be related to several disjunct activities. The term "garbage collection" in SAP HANA environments is rather What is garbage collection in SAP HANA environments?
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