Design for speed: types BINARY_FLOAT vs NUMBER vs VARCHAR

We have a database which consists almost exclusively of whole numbers. All (except the identity columns) have less than 1,000 values and all are positive.

Throughout the day, many people bite with queries and never modify the data. The output is often floating point, but we do not need more than 2 or 3 decimal places of precision - a lot of it is average, quartiles, correlation, etc. - basic stats.

I'm not worried at all about the speed of INSERT/update - data set are changed only once a week on weekends, and could take 48 hours for what is important to us (it takes less than 30 minutes at the moment).

So, what are the best types of data to use for columns?

In general:

(1) for integers, is faster BINARY_FLOAT or NUMBER types (3)? I read that the types BINARY_FLOAT is faster than NUMBER because the CPU can run directly on it. The loss of precision is not important in our case.

(2) our identity columns (user ID) are 10-digit numbers - the numeric value is used only for the PK/FK relationship. Is faster BINARY_FLOAT, NUMBER types (10) or VARCHAR2 (10)?

(3) we also have a bunch of lookup columns for descriptions 2-digit numbers, strings, etc. BINARY_FLOAT, NUMBER types (2) or VARCHAR (2)?

I guess that "smaller storage in the comic book" essentially equals faster, because more of the DB should be stored in the memory cache.

Thank you, brain trust!

See the first response to this link so that Tom Kyte says about using vs PLS_INTEGER NUMBER PL_SQL. It the measure as an important place. And it's strictly in the PL/SQL engine and memory storage. So for handling and external storage it will probably not even measurable.

http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:5340131040835

Here is what Tom Kyte says about storage
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:4246401300346330419

>
virtually all of the data is stored in a mode 'string like. '

A string will be an indicator of null, a length byte or bytes (characters of <=250 characters="" -="" 1="" byte,="">250-2 bytes), followed by the data.

A number will have a null flag/length byte (numbers are length 0.22 bytes) followed by the variable amount of data.

A binary_float kinds consumes 5 bytes - a null flag/length byte followed by 4-byte floating point data of the main.

A binary_double will consume 9 bytes - leading indicator/length zero followed by 8 bytes of floating point data.
>

Here is a test code that will show you the requirements of physical storage for several types.

CREATE TABLE SCOTT.NUMBER_TEST1
(
  B_FLOAT        BINARY_FLOAT,
  NUM10          NUMBER(10),
  VARCHAR2_10    VARCHAR2(10 BYTE),
  PLAIN_INT      INTEGER,
  SMALL_INT      INTEGER,
  PLAIN_DECIMAL  INTEGER
)

insert into number_test1 values (1,1,'1', 1,1,1)

insert into number_test1 values (1000,1000,1000,1000,1000,1000)

insert into number_test1 values (999, 999,999,999,999,999)

select 'Float', b_float, dump(b_float) dump_float
from number_test1
union
select 'Num10', num10, dump(num10) dump_num10
from number_test1
union
select 'Varchar2_10', to_number(varchar2_10), dump (varchar2_10) dump_varchar2_10
from number_test1
union
select 'Int', plain_int, dump (plain_int) dump_int
from number_test1
union
select 'SmallInt', small_int, dump (small_int) dump_small_int
from number_test1
union
select 'Decimal', plain_decimal, dump (plain_decimal) dump_decimal
from number_test1

Decimal     1     Typ=2 Len=2: 193,2
Decimal     999     Typ=2 Len=3: 194,10,100
Decimal     1000     Typ=2 Len=2: 194,11
Float     1     Typ=100 Len=4: 191,128,0,0
Float     999     Typ=100 Len=4: 196,121,192,0
Float     1000     Typ=100 Len=4: 196,122,0,0
Int     1     Typ=2 Len=2: 193,2
Int     999     Typ=2 Len=3: 194,10,100
Int     1000     Typ=2 Len=2: 194,11
Num10     1     Typ=2 Len=2: 193,2
Num10     999     Typ=2 Len=3: 194,10,100
Num10     1000     Typ=2 Len=2: 194,11
SmallInt     1     Typ=2 Len=2: 193,2
SmallInt     999     Typ=2 Len=3: 194,10,100
SmallInt     1000     Typ=2 Len=2: 194,11
Varchar2_10     1     Typ=1 Len=1: 49
Varchar2_10     999     Typ=1 Len=3: 57,57,57
Varchar2_10     1000     Typ=1 Len=4: 49,48,48,48

Tags: Database

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