Number and Float column size

What's the size limitation on the NUMBER type column, how many digits it can be?
I need to convert the data in the column to a byte array and I need to decide how long the byte array shoud be before hand.
Also, I need the same info for a FLOAT type column.
Can someone help me with it? Thanks.

see
http://technet.oracle.com/docs/products/oracle8i/doc_library/817_doc/server.817/a85397/sql_elem.htm#45443
Excerpt from the document:
NUMBER Datatype
The NUMBER datatype stores zero, positive, and negative fixed and floating-point numbers with magnitudes between 1.0 x 10^-130 and 9.9...9 x 10^125 (38 nines followed by 88 zeroes) with 38 digits of precision. If you specify an arithmetic expression whose value has a magnitude greater than or equal to 1.0 x 10^126, Oracle returns an error.

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Precision loss - conversions between exact values and floating point values

Hi!
I read this in your SQL Reference manual, but I don't quite get it.
Conversions between exact numeric values (TT_TINYINT, TT_SMALLINT, TT_INTEGER, TT_BIGINT, NUMBER) and floating-point values (BINARY_FLOAT, BINARY_DOUBLE) can be inexact because the exact numeric values use decimal precision whereas the floating-point numbers use binary precision.
Could you please give two examples: one where a TT_TINYINT is converted to a BINARY_DOUBLE and one when a TT_BIGINT is converted into a DOUBLE, both cases give examples on lost precision? This would be very helpful.
Thanks!
Sune

chokpa wrote:
Public Example (float... values){}
new Example (1, 1e2, 3.0, 4.754);It accepts it if I just use 1,2,3,4 as the values being passed in, but doesn't like it if I use actual float values.Those are double literals, try
new Example (1f, 1e2f, 3.0f, 4.754f);

How to know columns and table name whose column size are modified

Hi guys
I want to know which all columns in the tables are modify
i.e. list of columns and table name whose column size are modified
Step1 :
CREATE TABLE employees
( employee_number number(5) ,
employee_name varchar2(50) ,
department_id number(10)
CREATE TABLE Supplier
( Supplier_number number(5) ,
Supplier_name varchar2(50) ,
CREATE TABLE customers
( customer_id number(10) not null,
customer_name varchar2(50),
address varchar2(50),
city varchar2(50),
state varchar2(25),
zip_code varchar2(10),
Step2 :
Alter table employees
MODIFY employee_number number(10)
ALTER TABLE supplier
MODIFY supplier_name varchar2(100)
step3
query to dispaly
columnname table name
employee_number employees
supplier_name supplier
How to know columns and table name whose column size are modified
could you please provide query
Thanks in Advance

09:35:50 SQL> desc dba_objects
Name                            Null?    Type
OWNER                                  VARCHAR2(30)
OBJECT_NAME                             VARCHAR2(128)
SUBOBJECT_NAME                         VARCHAR2(30)
OBJECT_ID                             NUMBER
DATA_OBJECT_ID                         NUMBER
OBJECT_TYPE                             VARCHAR2(19)
CREATED                             DATE
LAST_DDL_TIME                             DATE
TIMESTAMP                             VARCHAR2(19)
STATUS                              VARCHAR2(7)
TEMPORARY                             VARCHAR2(1)
GENERATED                             VARCHAR2(1)
SECONDARY                             VARCHAR2(1)
NAMESPACE                             NUMBER
EDITION_NAME                             VARCHAR2(30)LAST_DDL_TIME can be utilized

Set maximum matrix row and column size

I hope someone can help me with this. Is there any way to set the row and column size of a matrix control? I have not been able to find a solution. The only way I've been able to set the size is by resetting matrix to its previous state if the user inputs a value outside of the bounds I would like to set. This is done in the 'value changed' event case.
The matrix is large and therefore I cannot increase the size of the control to be the maximum size and then hide the row and column index controls. These have to be displayed.
Any suggestions or help would be greatly appreciated. Thanks in advance.

Here's a quick and dirty way.
Simply hide the index controls and replace them with some fake numeric controls and set the data range accoding to your requirements.
In the attached example (LV8.0), the fake index controls are limited to 0..2, the array size is 5x5 and the displayed array portion is 3x3. Seems to work fine.
(Of course you could add a bit more code to set the limits automatically based on the various sizes.)
You could also make it more fancy and turn the entire thing into an Xcontrol.
Message Edited by altenbach on 06-06-2007 05:32 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
LimitArrayControl.vi ‏18 KB

How can I determine the number and sizes of redologs?

Dear all,
How can I determine the number and sizes of redologs are sufficient to allow redo log switching while hot backup is in progress?
Please advice,
Amy

Two questions here - what the OP put as the subject title and what was asked in the thread, which are different questions.
I would interpret the question in the thread to mean "how to avoid hanging due to archiving waiting for a redo log group to become available." Alert log, wait events, and user complaints would be the source of information here.

How can I determine the number and size of the items in a window?

With operating systems before Mavericks, the number of items contained and the total size was displayed at the bottom of an open window. This was valuable, for example, when assembling files and folders for burning to discs. How can I quickly obtain the information using Mavericks?

Welcome to Apple Support Communities
That setting is hidden by default, but Finder still has got the feature. To enable it, open a Finder window and go to View menu (in the menu bar) -> Show Status Bar

How to Increase the Rows and Columns Size of Bex Query in Enterprise Portal of SAP 7.3

Dear All,
Please let me know the process how to Increase the Rows and Columns Size of Bex Query in Enterprise Portal of SAP 7.3 .
Currently I am getting Only 4 columns and 10 rows in One Page .And I am getting 1,2 etc tabs for both row and column. So i want to increase the column length more than 100 and row length more than 10000.
Please suggest me a suitable solution to over come this issue.
Please find the Below screen shot.
Thanks
Regards,
Sai

Dear All,
Please find the attached screen shot.
The report be open with 4 or 5 columns and 5 or 6 rows.
So, please let me know how to increase the length of the table.
Do the needful for me to over come this issue.
Thanks
Regards,
Sai.

Max Number of Time Series and Other Columns?

What are the ceilings on the number of Time Series and Other Columns that BOP can handle?
I can not find this very basic info anywhere but I have a client that I think has hit it.

@ cfr:
I googled. But I opened this thread the July 25th and I'd forgot about that link and the fact that my problem could be Firefox fault. Silly me. -_-
I'm trying to surf w/ Chromium right now (I don't like very much Opera and other browsers based on Webkit don't read much stuff on the web) to check if issue returns. If so I'll try to check log.
Edit:
I found that I don't even like Chromium as well. So I think I'll use W3m and Elinks for "normal browsing" and FireFox just when I need to write a mail with my damned Hotmail account.
Edit (2012-10-08):
the issue still presist, even without Firefox.
Last edited by rix (2012-10-08 20:16:25)

Finding percentage of one number and the latest in a column?

Hello, I'm very new to numbers... like started an hour ago new. Anyway, I'm wanting to find the percentage of a one number and then dynamicly the newest number in a column. I'm entering my weight and wanting to find the percentage I lost from my starting weight. Thank you, Steven.

Steve,
Nice resolution! Here's my take on a solution, as I read your problem statement:
First, Format the % Loss cell to % using the Format Bar or Cells Inspector. Then enter the formuals.
Here are the formulas:
Starting Wgt
=INDEX(Wgt Data :: A:B,MATCH(MIN(Wgt Data :: A), Wgt Data :: A),2)
Latest Wgt
=INDEX(Wgt Data :: A:B,MATCH(MAX(Wgt Data :: A), Wgt Data :: A),2)
% Loss
=1-B/A
Hope this works and that you keep the weight off
Jerry

Need dissociation street name and street number from one column?

Hi all,
I have one table A with one column with Street name and street number.
And I was adding second column and now need update this second column with street number
and delete street number from first column.
How can unpluging street name and street number from one column?
(street name are 90% char, number is 100 numeric, in 10% street name name
starts with number (1.HEROES 223, 1.HEROES 224...)
Gordan

Hi,
Solution of Mr. Wijk come first, however I like to post (it's very similar and incomplete, I know...). Supose you have a table call address (use position -1 like Mr. Wijk to look backward). It's better in cases like '1.My Street 123' (the space before the number is very important)
SELECT substr(a.street_name,
              1,
              instr(a.street_name,
                    -1) - 1) street_name,
       substr(a.street_name,
              instr(a.street_name,
                    -1) + 1) street_number
FROM address a;Regards,

Dynamically add and modify listbox columns number and names

I need to dynamically modify number and names of columns in a listbox.
What should I do for this? And is it even possible?

Frank-
Thanks for the suggestion -- I hadn't tried that but just did and it still doesn't seem to work. Would the binding cache AttrDefs separately from results?

Storage Spaces, Columns and different Disk sizes

Let's assume the szenario of a 8-disk Storage Pool:
6x 4 TB HDD
2x 1 TB HDD
Now, a virtual Disk is created that uses a Mirrored-Layout and 4 Columns.
What will happen, once the written amount of data equals 1 TB per Disk?
Since the Drive is configured as double mirror with 4 Columns, will it:
- Stop accepting any data, since there is no 4th column available (The 1TB Disks are full)?
- Continue accepting data, but create a "pseudo-4-Column-Layout", where the actual 4th column is on the same disk as column 1,2 or 3?
- Switch to a 3 Column layout in order to utilize the remaining diskspace on disk 1-6? (If so, can the column count be restored later on, when adding more disks?)
- ...explode?
- Anyting else?
best,
dognose

Hi,
Columns correlate to underlying physical disks across which one stripe of data for a storage space is written. Since the virtual disk uses a Mirrored-Layout and 4 Columns, it will only get space equal to the size of 4*smallest drive=4*1=4TB, which will leave
portions of the larger drives unused. If the written amount of data equals 1 TB per Disk, you will add 2*4=8 disks to expand the virtual disk.
For more detailed information about NumberOfColumns, you could refer to the artice below:
Storage Spaces Frequently Asked Questions (FAQ)
http://social.technet.microsoft.com/wiki/contents/articles/11382.storage-spaces-frequently-asked-questions-faq.aspx#What_are_columns_and_how_does_Storage_Spaces_decide_how_many_to_use
Best Regards,
Mandy
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

What table column size is needed to accomodate Unicode characters

Hi guys,
I have encounter something which i dont understand and i hope gurus here will shed some light on me.
I am running a non-unicode database and i decided to port the data over to a unicode database.
So
1) i export the schema out --> data.dmp
2) then i create the unicode database + create a user
3) then i import the schema into the database
during the imp i can see that character conversion will take place.
During importing of data into the unicode database
I encounter some error
saying column size is too small
so i went to check the row that has the column value that is too large to fit in the table.
I realise it has some [][][][] data.. so i went to the live non-unicode database and find the row. Indeed it has some [][][][] rubbish data which i feel that someone has inserted other language then english into the database.
But regardless,
I went to modify the column size to a larger size, now the row can be accommodated. However the data is still [][][].
q1) why so ? since now my database is unicode, during the import, this column data [][][] should be converted to unicode already but i still have problem seeing what language it is.
q2) why at the non-unicode database, the [][][] data can fit into the table column size, but on unicode database, the same table column size need to be increase ?
q3) while doing more research on unicode, it was said that unicode character takes up 2 byte per character. Alot of my table data are exactly the same size of the table column size.
E.g Name VARCHAR2(5);
value - 'Peter'
Now if converting to unicode, characters will take 2byte instead of 1, isnt 'PETER' going to take up 10byte ( 2 byte per character ),
why is it that i can still accomodate the data into the table column ?
q4) now with unicode database up, i will be supporting different language characters around the world. How big should i set my column size to ? the longest a name can get ? or ?
Thanks guys!

/// does oracle automatically "look" at the each and individual characters in a word and determine how much byte it should take.
Characters usually originate from a keyboard, which has an associated keyboard layout and an associated character set encoding (a.k.a code page, a.k.a. encoding). This means, the keyboard driver knows that when a key with a letter "á" on it is pressed on a French keyboard, and the associated character set encoding is MS Code Page 1252 (Oracle name WE8MSWIN1252), then one byte with the value 225 is generated. If the associated character set encoding is UTF-16LE (standard internal Windows encoding), two bytes 225 and 0 are generated. When the generated bytes travel through APIs, they may undergo character set conversions from one encoding to another encoding. The conversion algorithms use translation tables to find out how to translate given byte sequence from one encoding to another encoding. In case of translation from WE8MSWIN1252 to AL32UTF8, Oracle will know that the byte sequence resulting from conversion of the code 225 should be 195 followed by 161. For a Chinese characters, for example when converting it from ZHS16GBK, Oracle knows the resulting sequence as well, and this sequence is usually 3 bytes.
This is how AL32UTF8 data gets into a database. Now, when Oracle processes a multibyte string, and needs to look at individual characters, for example to count them with LENGTH, or take a substring with SUBSTR, it uses information it has about the structure of the character set. Multibyte character sets are of two type: fixed-width and variable-width. Currently, Oracle supports only one fixed-width multibyte character set in the database: AL16UTF16, which is Oracle's name for Unicode UTF-16BE encoding. It supports this character set for NCHAR/NVARCHAR2/NCLOB data types only. This character set uses two bytes per each character code. To find the next code, 2 is simply added to the string pointer.
All other Oracle multibyte character sets are variable-width character sets, including AL32UTF8. In most cases, the length of each character code can be determined by looking at its first byte. In AL32UTF8, the number of 1-bits in the most significant positions in the first byte before the first 0-bit tells how many bytes a character has. 0 such bits means 1 byte (such codes are identical to 7-bit ASCII), 2 such bits mean two bytes, 3 bits mean 3 bytes, 4 bits mean four bytes. 1 bit (e.g. the bit sequence 10) starts each second, third or fourth byte of a code.
In other ASCII-based multibyte character sets, the number of bytes is usually determined by the value range of the first byte. Bytes below 128 means a one-byte code, bytes above 128 begin a two- or three-byte sequence, depending on the range.
There are also EBCDIC-based (mainframe) multibyte character sets, a.k.a shift-sensitive character sets, where a sequence of two-byte codes is introduced by inserting the SO character (code 14=0x0e) and ended by inserting the SI character (code 15=0x0f). There are also character sets, like ISO-2022-JP, which use more complicated byte sequences to define the length and meaning of byte sequences but Oracle supports them only in limited number of places.
/// e.g i have a word with 4 character. the 3rd character will be a chinese character..the rest are ascii character
/// will oracle use 4 byte per character regardless its ascii(english) or chinese
No.
/// or it will use 1 byte per english character then 3 byte for the chinese character ? e.g.total - 6 bytes taken
It will use 6 bytes.
Thnx,
Sergiusz

Difference between datatype NUMBER and NUMBER(38)

Difference between datatype NUMBER and NUMBER(38)

From
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements001.htm#i54330
NUMBER Datatype
The NUMBER datatype stores zero as well as positive and negative fixed numbers with absolute values from 1.0 x 10-130 to (but not including) 1.0 x 10126. If you specify an arithmetic expression whose value has an absolute value greater than or equal to 1.0 x 10126, then Oracle returns an error. Each NUMBER value requires from 1 to 22 bytes.
Specify a fixed-point number using the following form:
NUMBER(p,s)
where:
p is the precision, or the total number of significant decimal digits, where the most significant digit is the left-most nonzero digit, and the least significant digit is the right-most known digit. Oracle guarantees the portability of numbers with precision of up to 20 base-100 digits, which is equivalent to 39 or 40 decimal digits depending on the position of the decimal point.
s is the scale, or the number of digits from the decimal point to the least significant digit. The scale can range from -84 to 127.
Positive scale is the number of significant digits to the right of the decimal point to and including the least significant digit.
Negative scale is the number of significant digits to the left of the decimal point, to but not including the least significant digit. For negative scale the least significant digit is on the left side of the decimal point, because the actual data is rounded to the specified number of places to the left of the decimal point. For example, a specification of (10,-2) means to round to hundreds.
Scale can be greater than precision, most commonly when e notation is used. When scale is greater than precision, the precision specifies the maximum number of significant digits to the right of the decimal point. For example, a column defined as NUMBER(4,5) requires a zero for the first digit after the decimal point and rounds all values past the fifth digit after the decimal point.
It is good practice to specify the scale and precision of a fixed-point number column for extra integrity checking on input. Specifying scale and precision does not force all values to a fixed length. If a value exceeds the precision, then Oracle returns an error. If a value exceeds the scale, then Oracle rounds it.
Specify an integer using the following form:
NUMBER(p)
This represents a fixed-point number with precision p and scale 0 and is equivalent to NUMBER(p,0).
Specify a floating-point number using the following form:
NUMBER
The absence of precision and scale designators specifies the maximum range and precision for an Oracle number.
And
2
NUMBER[(precision [, scale]])
Number having precision p and scale s. The precision p can range from 1 to 38. The scale s can range from -84 to 127
Sybrand Bakker
Senior Oracle DBA

Gather_table_stats with a method opt of "for all indexed columns size 0"

I have 9 databases I support that contain the same structure, and very similar data concentrations. We are seeing inconsistent performance in the different databases due to bind variable peeking.. I have tracked it down to the Min and Max values that are gathered during the analyze. I analyze from one cluster, and export/import those statistics into the other clusters.. I then go about locking down the stats gathered. Some of the statistics are on tables that contain transient data (the older data is purged, and new data gets a new PK sequence number).
Since I am gathering statistics with a 'FOR ALL INDEXED COLUMNS SIZE 1', a min and max value are grabbed. This value is only appropriate for a short period of time, and only for a specific database. I do want oracle to know the density to help calculate, but I don't want cardinality based on whether the current bind values fall in this range..
Example
COLUMN PK
When I analyze the min is 1 and max is 5. I then let the database run, and the new min is 100 and max is 105.. same number of rows, but different min/max. At first a select * from table where pk>=1 and pk <=5 would return a cardinality of 5.. Later, a seelct * from tables where pk>=100 and pk<=105 would return a cardinaility 1.
Any ideas how to avoid this other than trying set min and max to something myself (like min =1 max = 99999999). ??

MarkDPowell wrote:
The Oracle documentation on bind variable peeking said it did not peek without histograms and I cannot remember ever seeing on 9.2 where the trace showed otherwise. Mark,
see this simple test case run on 9.2.0.8. No histograms, but bind variable peeking, as you can see that the EXPLAIN PLAN output generated by AUTOTRACE differs from the estimated cardinality of the actual plan used at runtime.
Which documentation do you refer to?
SQL>
SQL> alter session set nls_language = 'AMERICAN';
Session altered.
SQL>
SQL> drop table bind_peek_test;
Table dropped.
SQL>
SQL> create table bind_peek_test
2 as
3 select
4            100 as n1
5          , cast(dbms_random.string('a', 20) as varchar2(20)) as filler
6 from
7            dual
8 connect by
9            level <= 1000;
Table created.
SQL>
SQL> exec dbms_stats.gather_table_stats(null, 'bind_peek_test', method_opt=>'FOR ALL COLUMNS SIZE 1')
PL/SQL procedure successfully completed.
SQL>
SQL> variable n number
SQL>
SQL> variable n2 number
SQL>
SQL> alter system flush shared_pool;
System altered.
SQL>
SQL> exec :n := 1; :n2 := 50;
PL/SQL procedure successfully completed.
SQL>
SQL> set autotrace traceonly
SQL>
SQL> select * from bind_peek_test where n1 >= :n and n1 <= :n2;
no rows selected
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1000 Bytes=24
          000)
   1    0   FILTER
   2    1     TABLE ACCESS (FULL) OF 'BIND_PEEK_TEST' (Cost=2 Card=100
          0 Bytes=24000)
Statistics
        236 recursive calls
          0 db block gets
         35 consistent gets
          0 physical reads
          0 redo size
        299 bytes sent via SQL*Net to client
        372 bytes received via SQL*Net from client
          1 SQL*Net roundtrips to/from client
          4 sorts (memory)
          0 sorts (disk)
          0 rows processed
SQL>
SQL> set autotrace off
SQL>
SQL> select
2            cardinality
3 from
4            v$sql_plan
5 where
6            cardinality is not null
7 and      hash_value in (
8    select
9           hash_value
10    from
11           v$sql
12    where
13           sql_text like 'select * from bind_peek_test%'
14    );
CARDINALITY
          1
SQL>
SQL> alter system flush shared_pool;
System altered.
SQL>
SQL> exec :n := 100; :n2 := 100;
PL/SQL procedure successfully completed.
SQL>
SQL> set autotrace traceonly
SQL>
SQL> select * from bind_peek_test where n1 >= :n and n1 <= :n2;
1000 rows selected.
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1000 Bytes=24
          000)
   1    0   FILTER
   2    1     TABLE ACCESS (FULL) OF 'BIND_PEEK_TEST' (Cost=2 Card=100
          0 Bytes=24000)
Statistics
        236 recursive calls
          0 db block gets
        102 consistent gets
          0 physical reads
          0 redo size
      34435 bytes sent via SQL*Net to client
       1109 bytes received via SQL*Net from client
         68 SQL*Net roundtrips to/from client
          4 sorts (memory)
          0 sorts (disk)
       1000 rows processed
SQL>
SQL> set autotrace off
SQL>
SQL> select
2            cardinality
3 from
4            v$sql_plan
5 where
6            cardinality is not null
7 and      hash_value = (
8    select
9           hash_value
10    from
11           v$sql
12    where
13           sql_text like 'select * from bind_peek_test%'
14    );
CARDINALITY
       1000
SQL>
SQL> spool offRegards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Number and Float column size

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