Size of the numeric data type
HelloPlease can anyone suggest what will be the size allocated for a NUMBER data type in a table.
When we question user_tab_columns all the table illustrates data_length 22 with the NUMBER data type.
So what is the importance of accuracy on the size it takes to store data on the storage device?
Please suggest...
I think it depends on the values that you actually store and you can find with VSIZE.
Please take a look at this article:
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:1856720300346322149
Published by: hm on 29.09.2011 05:33
Tags: Database
Similar Questions
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Hello
I know size of integer data type is 4 bytes. It is predefined. But I could see integer (5) in some articles. whether a statement is correct or not. If Yes, could you please explain me a little more.
See you soon
Ravi KNo, the INTEGER data type is an alias for Number (38)
http://download.Oracle.com/docs/CD/E11882_01/server.112/e17118/sql_elements001.htm#SQLRF00213
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Largest number of digits for the NUMBER data type?
What length more of a NUMBER that Oracle will "support"?
The documentation says the following:
Limitations of the data type says:
«Can be represented in a comprehensive precision 38 digits»
NUMBER of Data Types says:
"Oracle guarantees portability of numbers with precision of up to 20 digits of base-100, which equals 39 or 40 decimal digits according to the position of the decimal point."
I realize account that if I define a column as simply NUMBER, I can insert numbers with a size up to 126 characters. However, Oracle seems to maintain only the first 40 digits in MOST cases. The largest number of digits, it seems to allow is 40 before it begins to be replaced by 0.
With numbers that have more than 40 figures, Oracle will sometimes replace all numbers according to the 38th numbers with a 0 and sometimes replace 0 after the digit 39th or 40th.
Therefore, what is the largest number of digits, can be trusted to safely store Oracle?
This is the code I used for this testing process.
create the table max_num (num number);
declare
number of l_x;
Start
for x in 1.200
loop
l_x: = x;
insert into max_num values (rpad (1, x, 1));
end loop;
exception
while others then
dbms_output.put_line ('STOP: ' | l_x);
dbms_output.put_line (SQLERRM);
end;
/
Select num, length (replace (num, 0)) of max_num;
What length more of a NUMBER that Oracle will "support"?
You have already given your own answer. If 'length': the maximum number of digits is written the doc gives you the answer:
999... (38 9's) x 10 value maximum125
The 38/39/40, hereinafter referred to as the doc means "significant digits". This is why rounding or truncation occurs if you provide more significant digits of 38/39/40.
Oracle stores the numbers internally in a binary format 21 bytes using a documented structure in the doc of the OIC in the section 'NUMBER'.
http://docs.Oracle.com/CD/E11882_01/AppDev.112/e10646/oci03typ.htm#i423684
Oracle database stores the values of the
NUMBER
data type in a variable length format. The first byte is the exponent and is followed by 1 to 20 mantissa bytes. The high bit of the exponent byte is the sign bit; It is defined for positive numbers, and it is cleared for negative numbers. The lower 7 bits represent the exponent, which is a number of base-100 with an offset of 65.This article from doc continues to show you how to convert the internal format to the real value.
An additional byte of 1 is used for all types of data to store the length; That's why you often see docs saying numbers can take 22 bytes.
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Problem with the CLOB data type.
Greetings,
I am facing a problem with the CLOB data type. I know that the CLOB data type is 4 GB (I use Oracle 9i). But in the Pl Sql procedure, I can only store 34305 size for a CLOB variable character data.
This is the test script that I am trying to run.
DECLARE
-Local variables here*.
I have INTEGER;
C_1 CLOB.
BEGIN
FOR Rec IN (SELECT
*
ACCORDING TO THE TABLE)
LOOP
C_1: = c_1 | Rec.Clo_1;
END LOOP;
EXCEPTION
WHILE OTHERS THEN
Dbms_Output.put_line (SQLERRM);
END;
Here variable C_1 range value 34305 good character regardless of type CLOB. Now the above script fails if query my buckle - huge number of return values. It is throwing the exception "error during transfer of files ORA-06502: PL/SQL: digital error or value."
He would be grateful if someone can help me on this.
Thank you.You are probably better off using DBMS_LOB.append, instead of the concatenation of varchar2 (|).
And... take off your when-other Manager exceptions, please...
-
DLL for LabWindows/CVI 8.0 with the bool data type
Hello
I want to use a new SWIR camera in LabWindows/CVI 8.0 (Windows XP 32bits).
The company delivered with the camera produced a 32-bit dll by using Microsoft Visual C++ 2010. The .dll and .lib and .h files include a working SDK/API (some functions with the bool data type)
Compilation-online syntax error, variable Boolean is not a data type in LabWindows/CVI 8.0
Generate the import of DLL-online syntax error library
I tried to convert bool char (typedef unsigned char bool => no more syntax error but the functions does not work.)
What can I do?
Martin
Hello again, Naumann!
Microsoft Visual C++ 2010 represents Boolean using 1 byte, as stated by MSDN: https://msdn.microsoft.com/en-us/library/tf4dy80a(v=vs.100).aspx
I guess that you import C++ functions using the syntax for extern "C". Otherwise, because of the C++ name mangling wouldn't you able to bind C++ library against your code CVI.
You can also specify how you import C++ functions?
In addition, because you have not described the problem as a corruption of heads or runtime error, I guess the C++ library function is called correctly the CVI. That said, I tend to believe that the problem is not really in the mechanism of interaction of C/C++, but in the C++ library. If you would start calling a dummy C++ function returning an integer from a simple CVI application that should work, because redefine bool in CVI 1 byte must ensure that settings are correctly transferred onto the stack.
If you need to create a wrapper function of C++ that is not using bool and calls the C++ function, I expect to return the same result.
Maybe you are missing a few prior initialization steps required? The provider of the camera also comes all example code?
Best regards!
-Johannes
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As an operator with the long data type
Oracle 10g.
Hi gurus
I want to apply as an operator on the long data type, but I get the error message, can you please help me why is that I use as an operator with the long data type. I did some research and but unable to find a solution, see query for more details below...
Query
SELECT trigger_body FROM user_triggers
WHERE trigger_body LIKE '% UPDA % CASE % ';
Error
ORA-00932: inconsistent data types: expected NUMBER got LONG
00932 00000 - ' incompatible data types: wait %s %s got. "
* Cause:
* Action:
Error on line: column 2: 7
Concerning
Muzz
Adrian Billington wrote to the top of your options.
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Syntex to create the table with the long data type
I'm looking to create a table based on another table that having the column long data type. Throw the error ORA-00997: illegal use of the LONG data type
I tired itcreate table abc_long (ag bgd long number);
create table abc_long_dummy as ( ) Select *of abc_long); - ORA-00997 error: illegal use of the LONG data type
How to get there?
I'm looking to create a table based on another table that having the column long data type.
You really don't want to do that.
LONG data type has been deprecated for some time now, use CLOB.
The TO_LOB() function will do the conversion on the fly:
create table abc_long_dummy as select ag , to_lob(bgd) as bgd from abc_long ;
-
CREATE or REPLACE (name in varchar2) procedure Compress_tab_partition
is
last_mnth_var varchar2 (8);
curr_mnth_var varchar2 (8);
number of last_mnth;
number of curr_mnth;
last_partition varchar2 (8);
high_val varchar2 (4000);
StartSelect to_char (add_months (trunc (sysdate, 'MM'),-1), 'YYYYMM') | ' 00' in the double last_mnth_var;
Select to_char (sysdate, 'YYYY') | TO_CHAR (sysdate, 'mm') | ' 00' in the double curr_mnth_var;
Select to_number (last_mnth_var) in the double last_mnth;
Select to_number (curr_mnth_var) in the double curr_mnth;Dbms_output.put_line ('Compression of GOLDMGR Table scores.' | table-name |) "to go". ») ;
Dbms_output.put_line(' ');/ * Step 1 - identify the name of the partition of the specified table must be compressed * /.
Select high_value from high_val from user_tab_partitions where table_name = table-name;
Select nom_partition into last_partition from user_tab_partitions where table_name = table-name and high_value = rtrim (high_val);/ * Step 2 - Alter partition table to compress * /.
run immediately "ALTER TABLE GOLDMGR." | table_name | ' CHANGE THE PARTITION '. last_partition | "COMPRESS by low query";
/ * Step 3 - Index rebuild step * /.
I'm in (select index_name in user_indexes where table_name = table-name)
loop
run immediately "ALTER INDEX GOLDMGR." | i.index_name |' REBUILD ";
end loop;Dbms_output.put_line (' COMPLETED: compress the Table partitions change.) ") ;
end;
/I'm getting an error like: Error (21,100): PL/SQL: ORA-00997: illegal use of the LONG data type
Please resolve.
HIGH_VALUE datatype is LONG. You may not use for a long TIME in WHERE clause expressions. You need to loop through the partitions by selecting HIGH_VALUE and then comparing. Secondly, there is no need to select double to calculate expressions. For example:
Select to_char (add_months (trunc (sysdate, 'MM'),-1), 'YYYYMM') | ' 00' in the double last_mnth_var;
should be replaced by
last_mnth_var: = to_char (add_months (trunc (sysdate, 'MM'),-1), 'YYYYMM') | ' 00'.
and there is no need to add_months here:
last_mnth_var: = to_char (trunc (sysdate, 'MM') - 1, "YYYYMM"). ' 00'.
But the main question is simply ALTER TABLE MODIFY PARTITION COMPRESS allows compression but does not compress. You must issue ALTER TABLE MOVE PARTITION COMPRESS:
SQL > create table tbl (n) partition by range (n)
2 (partition p1 values less than (maxvalue))
3. Select lpad('X',4000,'X') from dual connect by level<=>=>
4.Table created.
SQL > select bytes
2 from WHERE user_segments
3 where nom_segment = 'TBL '.
4 and nom_partition = 'P1 '.
5.BYTES
----------
830472192SQL > alter table tbl
2. change the partition p1 compress
3.Modified table.
SQL > select bytes
2 from WHERE user_segments
3 where nom_segment = 'TBL '.
4 and nom_partition = 'P1 '.
5.BYTES
----------
830472192SQL > alter table tbl
2. move the partition p1 compress
3.Modified table.
SQL > select bytes
2 from WHERE user_segments
3 where nom_segment = 'TBL '.
4 and nom_partition = 'P1 '.
5.BYTES
----------
8388608SQL >
SY.
-
ORA-00997: illegal use of the LONG data type
Hi all
11.2.0.1
ALTER TABLE SAFDB MOVE TABLESPACE DATA_TS_ENC
*
ERROR on line 1:
ORA-00997: illegal use of the LONG data type
Why illegal? How can I move this table?
Thank you very much
pK
Take a look who
http://aprakash.WordPress.com/2011/01/06/how-to-move-table-containing-long-or-LOB-columns/
Concerning
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Insert/update the column with the clob data type
Hi all
ORCL Version: 11g.
I have a table with the clob data type.
Test12
(col1 clob);
I'm trying to insert/update to update the column with more than 4000 characters.
But due to the limitation of tank 4000, I could not Insert/Update.
Need your help in resolving this issue.
THX
Rod.
The limit of 4000 characters is incorrect. That pertains only to the varchar2 data type. A clob can hold more than 4 G.
Here is an example that shows how to insert it, I found...
Otherwise, here is a way 'dirty' to do.
insert into your_table (COLA, COLB)
values
(PRIMARY_KEY, PART 1 OF DATA)
;
Update your_table
Define COLB = COLB | PART 2 OF BIG DATA
where COLA = PRIMARY_KEY;
Update your_table
Define COLB = COLB | PART 3 OF BIG DATA
where COLA = PRIMARY_KEY;
.. and so on...
I don't know that I personally recommend the second style... But he could do the job.
-
Where we can find the attachment data type short text
Hello
file type attachments are store at fnd_lob.
Where we can find the attachment data type short text in oracle apps.
Concerning
Hello
Thanks, that's useful.
-
How to use the LOB data type?
I can't create a table with the LOB data type.
Do I need an additional parameter in sys.odbc.ini?
My dsn information is
[tpch]
Driver=/home/TimesTen/TimesTen/tt1121/lib/libtten.so
Data store = / home/timesten/TimesTen/tt1121/tpch/tpch
LogDir = / home/timesten/TimesTen/tt1121/tpch/logs
PermSize = 4096
TempSize = 2048
PLSQL = 1
LOB = 1
DatabaseCharacterSet = US7ASCII
-bash-4, $ 1 ttdaemonadmin-version
TimesTen Release 11.2.1.2.0
There is no LOB = 1 attribute; Please, delete it from your definition ODBC to avoid potential errors.
LOB support has been added in the major version 11.2.2 TimesTen. So you use 11.2.1 LOB is not available. If you want to use LOB data, then you must upgrade to 11.2.2.
Chris
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XMLTable: definition of the columns data type of table
Hello world
I am using ORACLE 11 g and you want to shred XML into a table called test used. I was hoping I'd be able to get the types of data to the employees table existing instead of specify them in the clause of columns. Is this possible?
Here is an example of what I'm trying to do. But I get an error: PL/SQL: ORA-00907: lack the right parenthesis on the line starting with columns.
Error detailsinsert into EMPLOYEES select * from xmltable( '/employees/employee' passing EMP_XML columns FIRST_NAME EMPLOYEES.FIRST_NAME%TYPE path 'first_name', LAST_NAME EMPLOYEES.LAST_NAME%TYPE path 'last_name', GENDER EMPLOYEES.GENDER%TYPE path 'gender', AGE EMPLOYEES.AGE%TYPE path 'age' );
Thank you.columns FIRST_NAME EMPLOYEES.FIRST_NAME%TYPE path 'first_name', * ERROR at line 16: ORA-06550: line 16, column 42: PL/SQL: ORA-00907: missing right parenthesis ORA-06550: line 11, column 5: PL/SQL: SQL Statement ignored
Specification of column names is required, but you can omit the declaration of data types.
See: the function XMLTABLE SQL/XML in Oracle XML DB
XMLTable is used with storage XML based on a schema of XMLType data type is optional. If absent, the data type is inferred from the XML schema. If Oracle > XML DB is unable to determine the right type of a node, a default type VARCHAR2 (4000) is used.
It is an Oracle extension; in the SQL/XML standard, the data type is always required.
Note:
The alleged data type might change as a result of the application of a patch or upgrade of Oracle XML DB. In particular, a new set of release or patch might be able to > determine the data type when the previous version was unable to do so (and therefore not reimbursed to VARCHAR2 (4000)). To protect against such an eventuality, specify an explicit data type with the data type. -
ORA-02327: cannot create indexes on the LOB data type expression
DB 10.2.0.4
DB 5.2
I am not able to move lobindex and lobsegment. While try occurs below error
SQL > ALTER INDEX dev. "" SYS_IL0000718396C00002$ $"REBUILD THE TABLESPACE DATA_TEMP;
ALTER INDEX dev. "" SYS_IL0000718396C00002$ $"REBUILD TABLESPACE DATA_TEMP
*
ERROR on line 1:
ORA-02327: cannot create indexes on the LOB data type expression
Thank you
Published by: user13382934 on October 16, 2012 14:05correct syntax is
ALTER TABLE.MOVE the LOB (
)
STORE AS (tablespace); Where
is a name of the / columns LOB, not the name of the segment. Moving type LOB data will move its indexes as well. -
I want to convert the double data type to string type
I want to convert the double data type to string, have idea about thatHello
Use f
FN: String (ARG) returns the string value of the argument. The argument can be a number, boolean, or node-set element
Example: string (314)
Result: "314".http://w3schools.com/XPath/xpath_functions.asp#string
See you soon,.
Vlad
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