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26-Jul-2020 06:44

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As far back as Oracle 8.1.5 documentation, row movement applied to updatable partition keys.

A list partition where the partition key is a specific value is a good example of this.

if the total number of rows in a partition (either the one you delete from or the one you insert to) does not change in more than 10% i would not run runstats especially for that (assuming you are running runstats on some regular basis so the new statistics of the tables would be updated eventually).

updating partition key column-75

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if you only move 5% of the rows from one partition to another partition, then maybe you should not run runstats, especially if your partitions are very big, and runstats will consume alote of resources.

We intend to use a single SMALLINT column, PARTN_ID (Partition ID), as the partition key column on each partitioned table. If we UPDATE column PARTN_ID for existing rows via static SQL, will DB2 automatically redistribute the updated rows to the partitions indicated by the new values in PARTN_ID, or will the redistribution only happen at the next REORG? Will a RUNSTATS be required or merely advisable after the redistribution or REORG? Will plans need to be rebound after the redistirbution or REORG?

The column value would determine the partition to which INSERTed rows would be put. 1) The DBMS (in this case DB2) will locate data according to data partitioning key. If you update the partitioning key, and the partitioning map says they key belongs in another partition, it will be moved there, but the runstats is now out of balance, because the row count is now different among the partitions.

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. When records age out and are no longer relevant you can move those partitions off to an archive table or database so they are no longer processed.

Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community I am partitioning a table based on a column that is not a primary key? Partitioning will work with pretty much any field, but in order for it to work WELL the field(s) you partition on should be used in most, if not all, of your queries.this is a better way to do the update if you are about to update many rows, because when you update many rows using a sql statement you will cause massive logging, you will probably hit the maxium lock allowed and lock the entire partition, and it's a bit complex to implement commit logic into this massive update.



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