Partitions Related Questionn...

Hi All,
I want to move a partition from one table to another temporary table, by retaining the actual copy of the data in the initial table as well... Is it possible.... Howw,, Any documentationnn??
What happens when we move a partition?? Does the partition goes into read-mode only automaticallyy... As when this movement is happening, is it possible to insert the data in the partition simoultaneouslyy...
Are there anyy online documentss available through whichh i can grill more into Partitioning Conceptss... I have gone through the basic concepts of the partitioningg...
Thanks in Advance...

rahul12289471 wrote:
What happens when we move a partition?? The partition contents do not move - merely the ownership. With a partition exchange, the owner of the table data is swapped with the owner of the partitioned data. So the table now owns the partition data (and indexes) and the partition owns the table's data (and indexes).
The actual data does not move. Which is why exchanging a 1TB partition is as efficient (fast) as exchanging a 0 byte partition. And why this makes a very effective means of managing data in partition sets.
As there is no copying/moving of data involved, you cannot "retain" a copy of the data. To make a copy means requiring I/O to read the entire partitioned data set (all 1TB if that is the case) and then duplicating that (writing 1TB of data if that is the case).
Also keep in mind that duplicating data sets in a RDBMS is usually a silly and wrong thing to do. Relational design and relational databases are all about eliminating the need to duplicate data and then programatically maintain these duplicate data sets.
I/O is also the slowest and thus most expensive operation on a database. Why would you want to contribute to that, slowing down the database and server, by doing totally redundant I/O by reading and writing the exact same data multiple times?

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