Defining a view to point latest partition
Hi
I have a partition table on month-year. The partition names are like P201007, P201008, P201009 etc.
Now I want to create a view which will always point to the latest partition.
Is there any SQL command to do that?
Thanx
You can specify a partition in a query, but it is not a predicate and it can not be bound. So I think you will not be able to do it directly in a view.
That is, you can say
select * from your_table partition (P201009);but you can not say
select * from your_table where partition='P201009';or anything like that.
You can certainly create a view that specifies a single partition, but the partition you want would change from month to month. So you would have to redefine the view every month. That would not be a good design.
Partitions are intended to be pretty transparent to the user. The optimizer can decide to operate on a single partition if it determines that doing so is compatible with the query.
You may be able to query ALL_TAB_PARTITIONS , where HIGH_VALUE holds the maximum value allowed in the partition. PARTITION_POSITION can be used to find the partition with the highest and next-highest values. If you wrap this in a function, for example, then you could write a view that says
create or replace view your_table_latest as
select * from your_table
where effective_date >= get_date_of_lastest_partition_fnc('YOUR_TABLE');Note that this does not directly specify a partition - it has a date predicate which should be used by the optimizer to limit its scans etc. to the latest partition.
But... having said all that, I would suggest a different approach. Don't try to figure out the latest date by examining the partitions. It is evident that, somewhere in this process, you had to know which date to create the new partition for. So save that date in a table somewhere (possiibly a table with one row per table you are managing here) and use that in your view:
create or replace view your_table_latest as
select t.* from your_table t, lastest_refresh r
where t.effective_date = r.latest_refresh_date and r.table_name = 'YOUR_TABLE';
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