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Don Burleson Blog 







Database sizing for Oracle tips

Oracle Database Tips by Donald BurlesonMarch 2, 2015

Question:  How to I do database sizing for Oracle?
Answer:  The easiest way to perform database sizing for Oracle is with the Oracle capacity planning spreadsheets.

Database sizing for files should be sized based on the size of the objects that will store segments in their related tablespaces. To this end, before tablespace and database sizing can be accomplished the size of tables and indexes contained in them must be determined. The Oracle DBA manual contains sizing procedures allowing a DBA to manually calculate sizing for both tables and indexes, however it is suggested that spreadsheets be obtained or created to automate and standardize the calculations.

The database table sizing spreadsheet only requires the input of the table column sizes in the appropriate column (character, date and number) and the input of table specific items that deal with size such as initial transactions, percent free in a block, and number of rows. Additionally block size is specified. If the table is clustered then that too is taken into account to give a size estimate.

Using the index database sizing spreadsheet shown above the only required inputs are the size of the columns to be included in the index, initial transactions, percent free, blocksize and number of rows expected. If the index is a non-unique index, you can also enter the expected percent of time the index column(s) will contain data.

Using standardized spreadsheets ensures that the calculation is performed identically and with repeatable results, it also allows for tweaking of the calculation until after the third or fourth time it is used it should be giving accurate estimates based on your system.

Once all of the tables and indexes are sized for the first year's data (or whatever time interval you desire) add the total sizes together for each object in each tablespace. These totals give the amount of space required for current data up to and including estimates for this year's growth, usually you double it to allow for an additional year. These adjusted totals become the sizes for the tablespaces. If the estimated sizes are too large for either operating system file size limits or available space, multiple datafiles will be required for that tablespace.

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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