Solution : https://service.sap.com/sap/support/notes/832343 (SAP Service marketplace login required)
Summary :
The SAP Note discusses the concept and impacts of the clustering factor on database index performance. It begins by defining the clustering factor as a measure from index statistics reflecting the physical proximity of database records. A low clustering influence suggests good index-table alignment, enhancing data retrieval efficiency. Conversely, a high clustering factor often indicates that index entries are dispersed across the database, which can degrade performance due to increased disk I/O operations. Various strategies, including using the keep pool for smaller tables or the ALTER TABLE CACHE command for frequently accessed tables, are suggested to mitigate issues related to poor clustering factors. Additionally, the note offers SQL commands for assessing the clustering factor and explains when to consider optimization, reinforcing that interventions should be cautiously applied to avoid adversely impacting other operations.
Key words :
c1 + c2 + c3 + c4 + c5 + c6 + c7 + c8 + c9+c10, c1 + c2 + c3 + c4 + c5 + c6 + c7 + c8 + c9, c1 + c2 + c3 + c4 + c5 + c6 + c7 + c8, c1 + c2 + c3 + c4 + c5 + c6 + c7, c1 + c2 + c3 + c4 + c5 + c6, c1 + c2 + c3 + c4 + c5, c1 + c2 + c3 + c4, parallel insert operations insert data, c1 + c2 + c3, consecutive index entries frequently refer
Related Notes :
| 1016172 | Sorting table records during reorganization |
| 915242 | FAQ: Reverse key indexes |
| 912620 | FAQ: Oracle indexes |
| 910389 | FAQ: Oracle Segment Shrinking |
| 821687 | FAQ: Space utilization and fragmentation in Oracle |
| 789011 | FAQ: Oracle memory areas |
| 766349 | FAQ: Oracle SQL optimization |
| 762808 | FAQ: Keep pool |
| 750631 | Approximations for cost calculation of the CBO |
| 722188 | FAQ: Oracle partitioning |
| 641435 | FAQ: Oracle Index Organized Tables (IOTs) |
| 618868 | FAQ: Oracle performance |
| 588668 | FAQ: Database statistics |
| 541538 | FAQ: Reorganization |
| 125817 | Clustering of table RESB according to the material number |
| 85558 | Tables with data sorted by index |