How to identify fields which are fast approaching the size limits
Hi All,
Is there an easy (or any) way of identifying Database fields whose field sizes are close to the limits.
Example: I have field called SEQ_NUM, size of the field is 3 and currently latest value in the filed is 995, soon it will be a 1000.
Thanks
Raghu
Hi, Raghu,
Assuming your statistics are up to date, you can start with the information in the data dictionary view user_tab_columns (or all_tab_columns, or dba_tab_columns).
The column high_value is a RAW representing the highest value. There's a conversion function in the supplied package utl_raw.
The column data_precision is the maximum number of digits, and data_scale is the number of them to the right of the decimal point
SELECT table_name
, column_name
, utl_raw.cast_to_number (high_value) AS actual_high
, POWER (10, data_precision - data_scale) AS possible_high
FROM user_tab_columns
WHERE data_type = 'NUMBER'
AND ( utl_raw.cast_to_number (high_value) -- actual_high
/ POWER (10, data_precision - data_scale) -- possible_high
) > .95 -- or whatever
;I'm sure there are lots of special cases (large negative numbers, for example) that this will not catch.
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