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10 Mar

The IM column store does not replace the buffer cache, but acts as a supplement so that both memory areas can store the same data in different formats.

The IM column store is available starting with Oracle Database 12 clause is applicable only if you are using Oracle Real Application Clusters (Oracle RAC).

To enable a unique or primary key constraint, you must have the privileges necessary to create an index on the table.

With Hybrid Columnar Compression, data can be compressed during bulk load operations.

During the load process, data is transformed into a column-oriented format and then compressed.

If a query is compiled in an edition outside the usable range of editions for the virtual column, then the optimizer will not consider using the index.

based on whether they are considered valid as of a specified time, before a specified time, or during a specified time period.