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How many bytes for Oracle datatype timestamp and number.

Posted on 2009-04-06
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Last Modified: 2013-12-18
How many bytes should be counted for Oracle datatype timestamp/date and numbers? What is number(8,2)? For example,
PHONE#    char(10)
is counted 10 bytes, but for
Arrive_time     timestamp
how many bytes to be counted for timestamp?
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Question by:jl66
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sdstuber earned 500 total points
ID: 24080657
13 bytes in a timestamp...

select vsize(systimestamp), vsize(sysdate) from dual

a number will use the fewest number of bytes needed to store the value with a minimum of 2
regardless of precision or scale


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by:sdstuber
sdstuber earned 500 total points
ID: 24080722
actually
11 bytes for timestamp
13 bytes for timestamp with time zone

numer(8,2) will vary from 0 (for null) or 2-5 if populated
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Author Comment

by:jl66
ID: 24081183
Thanks for the info. How did you get "numer(8,2) will vary from 0 (for null) or 2-5 if populated"?
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by:jl66
ID: 24081377
How to get "11 bytes for timestamp"?
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by:sdstuber
sdstuber earned 500 total points
ID: 24081457

select vsize(arrive_time) from your_table

systimestamp is actually a "timestamp with time zone" type, sorry for the confusion.

null is 0 simply by nature of being NULL.  :)

you can check the size of your data by populating your number(8,2) column with data and examining it.

You'll see the smallest it ever gets is 2 bytes, the largest is 5 bytes.

select your_column,vsize(your_column) from your_table

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