A slower loading into partitioned table as the non partitioned table - why?

Hello

Using oracle 11.2.0.3.

Have a large fact table and do some comparative tests on the loading of large amounts of data histroical (several hundred GB) in fact range partitioned to date table.

Although I understand if use exhange partition loading may be faster to load a partitioned table, trying to figure out why a standard sql insert takes 3 x long to load a table partitioned compared to an identical table but not partitioned. Identical EVERYHING in terms of columsn and the sql that the insert and second partitioned sql execution to
ensure caching with no impact.

Local partitioned table a partitioned bitmap index as compared to the non-partitioned table that has standardnon-partioned bitmap indexes.

Any ideas/thoughts?

Thank you

One would expect that the queries that cannot no partition pruning may be slowed down, Yes.

An easy way to see this is to imagine that you have a partitioned local index b-tree and a query that needs to scan all partitions of the index to find a handful of lines that interest you (of course, this is not likely to be exactly what you see probably but we hope informative of the source of the problem). Let's say that each partition of the index has a height of 3, so for each partition, Oracle has read 3 blocks to reach the correct terminal node. So to analyze each of the N index partitions, you need block index 3 * N bed. If the index is not partitioned, perhaps the height of the index would go up to 4 or 5 If, in that case not partitioned, you must read 4 or 5 blocks. If you have hundreds or thousands of partitions, it can easily be hundreds of times more work to analyze all the index partitions individual he would to analyze one unpartitioned index.

Partitioning is not a magical option "go faster". It is a compromise - you optimize certain operations (such as those that can partition pruning) at the expense of operations that do not partition size.

Justin

Tags: Database

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