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Message Posted: Thu, 18 Dec 2003 @ 14:02:49 GMT


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Subj:		Partitioned Primary Index

From:		Ferry, Craig

We are thinking about using Partitioned Primary Indexes on some of our bigger tables. Does anyone have any feedback good or bad about using PPIs (i.e. performance gains/losses, access problems, etc)?

Does something like the following make sense if I want to partition in monthly chunks. Our tables are loaded each month with an additional month of information. Any thoughts/suggestions?

Would something like the following make sense for yearly/monthly partition, or is there a better way to do this? I'm not sure if the parser would know where to find the data this way. I tried to do a partition by year then by month but didn't have any luck.

CREATE TABLE my_db.my_table ,NO FALLBACK ,
     NO BEFORE JOURNAL,
     NO AFTER JOURNAL
     (date_invoice DATE FORMAT 'YY/MM/DD' NOT NULL,
      join_no INTEGER NOT NULL)
PRIMARY INDEX (date_invoice, join_no)
     PARTITION BY (extract(year from date_invoice) * 100 + extract(month
from date_invoice))

Thanks

Craig