Oracle Exam 1Z0-499 Topic 1 Question 32 Discussion

Thin Provisioned

Controls whether space is reserved for the volume. This property is only valid for LUNs. By default, a LUN reserves exactly enough space to completely fill the volume. This ensures that clients will not get out-of-space errors at inopportune times. This property allows the volume size to exceed the amount of available space. When set, the LUN will consume only the space that has been written to the LUN.

Hybrid Columnar Compression is an Oracle Database compression technology which enables the highest levels of data compression and provides enterprises with cost savings and performance improvements due to reduced I/O. Hybrid Columnar Compression can be enabled on Oracle Databases residing on dNFS shares without ASM on an Oracle ZFS Storage Appliance beginning with Oracle Database Enterprise Edition 11.2.0.3.

If your data does contain duplicates, enabling Data Deduplication will both save space by storing only one copy of a given block regardless of how many times it occurs.