June 2018
Intermediate to advanced
478 pages
10h 52m
English
Content preview from IBM Db2 11.1 Certification Guide
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ITC
Insert Time Clustering (ITC) tables provide an effective way of maintaining data clustering based on the insert time, along with easier space management. The characteristics of ITC tables are as follows:
- ITC table records are clustered based on their insert times.
- ITC tables have characteristics similar to MDC tables—they use block-based data allocation and a dimension block index. However, the data organization scheme is based on an implicitly created virtual dimension (record insert time) instead of explicitly stated dimension columns.
- ITC tables are created using the CREATE TABLE ... ORGANIZE BY INSERT TIME clause.
- ITC tables' space reclamation can be done by executing the REORG TABLE ... RECLAIM EXTENTS command.
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