Oracle Database 11 g - Online Public Access Catalog

552 CHAPTER 12 ■ DATA WAREHOUSINGPARTITION_NAMETABLESPACE_NAME---------------- ---------------------------P_JAN2007ALERT_D1SYS_P53ALERT_D3SYS_P54ALERT_D4SYS_P55ALERT_D5SYS_P56ALERT_D6SYS_P57ALERT_D1SYS_P58ALERT_D2SYS_P59ALERT_D3SYS_P60ALERT_D4SYS_P61ALERT_D5SYS_P62ALERT_D6SYS_P63ALERT_D1SYS_P64ALERT_D213 rows selected.At the same time, you have to ask yourself, “Is the price of a naming standard compromiseworth the automation?” You can clearly see that interval partitioning is one of the best featuresin Oracle Database 11g for day-to-day manageability.There are additional considerations that need to be reviewed for interval partitions.Interval partitioning has these restrictions:• You can specify only one partitioning key column, and it must be of the NUMBER orDATE datatype.• Interval partitioning does not supported index-organized tables.• You cannot create a domain index on an interval-partitioned table.Extended Composite PartitioningExtended composite partitioning enhancement is a long-awaited feature for many DBAs anddevelopers. Extended composite partitioning capabilities have been increased to addresscommon business problems for companies in the 21st century. Prior to Oracle Database 11g,the only composite partitioning schemes were range-list and range-hash partitioning. OracleDatabase 11g provides the complete composite partitioning options. In Oracle Database 11g,you now have the means to partition by two relevant date ranges. For example, you can partitiona table by ORDER_DATE and SHIP_DATE or by HIRE_DATE and COMMISSION_DATE. You now havethe flexibility to create a partition based on two relevant lists. For example, you can create acomposite partition based on state and city or by region and product group. There are four newextensions to the composite partitioning paradigm, discussed next.Composite List-Hash PartitioningYou can create a list partition subpartitioned by hash partitions. This enables the granularityfor partition-wise joins. This new partition mechanism can increase performance and fulfillsbusiness requirements for partitioning.