Size of datatype number

what happens if i don't specify a size of a "number"-column?
in oracle database concepts i found this:
"If a precision is not specified, the column stores values as given. If no scale is specified, the scale is zero."
could someone explain me this a littlebit more please? what means zero? does this mean maximum?
thanks

Oracle stores numbers as a binary value in the range of:
Positive numbers in the range 1 x 10-130 to 9.99..9 x 10125 with up to 38 significant digits
Negative numbers from -1 x 10-130 to 9.99..99 x 10125 with up to 38 significant digits.
Each number is stored in scientific notation with Oracle using 1 byte to store the exponent and up to 20 bytes to store the value.
For more information refer to:
http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76965/c10datyp.htm#743

Similar Messages

  • 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

  • What is the default font size and font number used in OBIEE piechar Legend

    Hi Experts,
    What is the default font size and font number used in OBIEE pie-chart Legend
    Thanks
    V

    The default is font size 11, Tahoma.

  • Reducing size of datatype involved in index fails where as increasing size work

    This question is related to my question in SO Database
    events that will cause deletion of index
    For example if i create a table like
    CREATE TABLE dbo.Customers (ID INT IDENTITY(1,1) PRIMARY KEY CLUSTERED, CustomerName NVARCHAR(200));
    CREATE INDEX IX_CustomerName ON dbo.Customers(CustomerName);
    And then try to change column datatype like shown below to 230 from 200.
    alter table Customers
    alter column CustomerName nvarchar(230) null
    The above alter command runs successfully and index IX_CustomerName is not dropped.
    But if i try to reduce the size of column to 150 from 200 then it shows error.
    alter table Customers
    alter column CustomerName nvarchar(150) null
    I get error like
    Msg 5074, Level 16, State 1, Line 1
    The index 'IX_CustomerName' is dependent on column 'CustomerName'.
    Msg 4922, Level 16, State 9, Line 1
    ALTER TABLE ALTER COLUMN CustomerName failed because one or more objects access this column.
    So reducing the size(data may loss) of a column does not work if index is present on a column where as if the index not present then above
    query works successfully. So why does it does not allow reducing the column when index present where as increasing size does not show any problem and works?

    Hello,
    Indeed, a little bit strange even because in BOL it's documented for a different behaviour, see
    ALTER TABLE (Transact-SQL) => Remarks =>
    "Changing the Size of a Column
    You can change the length, precision, or scale of a column by specifying a new size for the column data type in the ALTER COLUMN clause. If data exists in the column, the new size cannot be smaller than the maximum size of the data. Also, the column cannot
    be defined in an index, unless the column is a varchar, nvarchar, or varbinary data type and the index is not the result of a PRIMARY KEY constraint. See example P."
    Olaf Helper
    [ Blog] [ Xing] [ MVP]

  • Identify iPod SIZE by serial number

    Does anyone know how to conclusively identify an iPod shuffle storage size solely by its serial number? I've tried a couple of the online Mac serial number decoders, but I am not getting much info for the 3rd gen shuffle. I was sold a defective shuffle (Serial number 4H9437ESALD) and was told it was a 4gb. Since it could not be identified by iTunes or Windows, I could not confirm the size. I went through the Apple warranty replacement process and received a new Shuffle (Serial Number 4H0096BAALD) and immediately sold it on eBay (since it was sealed and new) and my buyer says it is a 2gb unit. Is there a specific digit placement in the SN sequence that identifies the SIZE? Thanks is advance. shmeebs

    Thanks B-rock, but unfortunately I do not have access to the model numbers for the same reasons as in my initial post - the defective one wouldn't load and the replacement was sold and is gone. All I have left for identification purposes now are the serial numbers I've listed: 4H9437ESALD & 4H0096BAALD. I was hoping there is something in the serial number encoding that would tell the size. There is no display, of course, and iTunes does not display the model numbers as shown in your link correct? shmeebs

  • How to find Average transaction size and average number of transactions/sec

    Would like to know
    1. how to find average transaction size
    2. number of transactions per sec
    using SQL queries. We also have statspack installed.
    Regards,
    Anirban

    SQL> select maxval,minval,average from SYS.V_$SYSMETRIC_SUMMARY where metric_name in ('User Transaction Per Sec');
    MAXVAL MINVAL AVERAGE
    .7 0 .149170735
    SYS.V_$SYSMETRIC_SUMMARY have to many other metrics check the one you need. (10G and above)
    Coskan Gundogar
    http://coskan.wordpress.com
    Edited by: coskan on Mar 31, 2009 12:42 PM

  • How to increase the size and the number of log files

    OS Win2000 BD version Oracle8.0.5
    When i Execute a big Transaction, for example: Insert into a table with 100,000 records,
    Oracle tell me that archive log require,
    but I write log_archive_start =true in init.ora;
    I think Maybe the size of log file too small?
    Any other suggestion?
    Thanks

    Hello Long Guohui,
    If your Database is running in Archive Log mode and if the Automatic Archiving is not enable then obviously Oracle
    will ask that "Archive Log Required".
    But if your Database is running with NoArchive Log mode then Oracle should never ask you that "Archive Log Required".
    If your Database is running with Archive Log Mode then Oracle always recommends that the Tablespace where
    you are going to Insert the 1,00,000 records, make that Tablespace Mode from Logging to Nologging, so that
    Archive will not be generated for those entries because Redo does not Generate for that Tablespace as it is
    Running in Nologging mode. If Redo generates for those 1,00,000 entries then it may affect the other DML
    executing in you Database. So it is always recommended to do like this. But after the Insertion is done
    successfully Oracle recommends immediately takes the Back of that Tablespace where you have just
    Inserted 1,00,000 Data.
    For making a Tablespace Nologging:
    ALTER TABLESPACE <TABLESPACE NAME> NOLOGGING;
    For Making a Database from NoArchive to Archive:
    1)     SHUTDOWN IMMEDIATE
    2)     IN THE init<sid>.ora FILE SET THE FOLLOWING PARAMETER WITH VALUE:
    LOG_ARCHIVE_START = TRUE
    3)     STARTUP MOUNT
    4)     ALTER DATABASE ARCHIVE LOG
    5)     ALTER DATABASE OPEN

  • Trouble with output string size of the 'number to hexadecima​l string' VI

    Hi everyone.
    I am new to Labview, so I apologise if this question is too simple. I am trying to convert a float to a hex string so I can pass it to a VISA Write VI. I first cast it, so it becomes a 32-bit int and then on to the 'number to hex string' VI. Now, since after the casting the number is a 32-bit int, I would assume that the output hex string would also be 32-bit long (so 4 bytes, which is what I need). However, I use the 'string length' Vi and it says the hex string is 8-byte long. Could someone please tell me why this is the case?
    Thank you very much in advance,
    Gabriel

    Are you sure it is 8 bytes? Don't confuse a nibble and a byte.
    Try the "flatten to string" function. 
    "There is a God shaped vacuum in the heart of every man which cannot be filled by any created thing, but only by God, the Creator, made known through Jesus." - Blaise Pascal

  • Size of datatypes (double, long, Date, BigDecimal)?

    In the language specification chapter 4 (http://java.sun.com/docs/books/jls/second_edition/html/typesValues.doc.html#48440) there are some sizes of some types. So, is this correct:
    * Estimated size of one instance of this class: 36 bytes + object overhead.
    public class MyBO {
        public String ID = null; //in general 10 chars long => 10 bytes
        public double amount = 0.0;  //double is 64 bits => 8 bytes
        public Date date = null; //Date stores long value (64 bits) => 8 bytes
        public BigDecimal bd = null; //BigDecimal: 32 bit scale + about 6 digits on the left side => 32 bits + 6 bytes => 10 bytes
    }Of course, I don't count the initial null values but estimate the size of all fields are set. Is this the correct size of such an object: 36 bytes + overhead of object?

    Of course, I need all 1.5 million objects in memroy
    at the same time - that's the reason of a cache! We
    calculate massive amount of data and if we read for
    eah customer, each portfolio, each asset, each
    position, each transaktion, each currency, each
    exchange rate, each value date the corresponding
    price value from the database, it takes hours and
    days to finish. That's the reason of this price
    cache. And that's the reason why I need as small
    objects as possible. And a full fledged Date object
    is much bigger than the corresponding long value.Is it safe to say that this thing could grow so that you'd then claim that you "need" to keep 1.5 billion or trillion etc objects in memory at the same time? What are you going to do about making it all fit then? Or is 1.5 million a set-in-stone watermark that you'll never need to grow beyond? I doubt the latter. It looks like your definition of a cache isn't what it really is supposed to mean - a cache should hold up to a certain level for fast retrieval of often-used or most-recently-used items, but 1.5 million seems like way too many.

  • Change the size of and number of rows retrieved in Popup Key LOV

    I have a Page Item of type Popup Key LOV (Displays description, returns key value).
    There are 100+ rows returned but each "page" in the popup window only holds 10, then the user has to click next to see the next 10 rows. Where can I change this setting so that 25 rows are returned per page?
    Also, is there a way to make this popup window wider so that a long string doesn't wrap, but stays on a single row.
    Edited by: mimi_jones on Nov 20, 2009 9:48 AM ADDED: APEX 3.1.1 Oracle 10g

    Go to Shared Components in the Application Builder for your app.
    Go to Templates.
    Go to Popup LOV template.
    The Window section allows you to change the height and width. The Pagination section allows you to change how many entries you see per page.
    Boris

  • Impact of table columns with number datatype but has no precision in Forms

    Hi.
    Currently, I have table columns that have a data type of number but has no precision declared (e.g. AGREEMENT_CODE NUMBER). I would just like to ask if there's anyone out there who knows if this has a negative impact on Oracle's forms and reports...with the way buffer memories are allocated or other things on performance. I am still putting in maximum length values for base table items. I don't know if this will affect buffer memory allocation as well.
    Thank you.

    I don't know this for fact, but I would think that numbers with a large number of significant figures might affect buffer sizes, but I'll bet your example AGREEMENT_CODE values would never have a large number of figures. In fact, whether or not you limit the size of a number in the database or your form probably does not affect the way the actual data values are transmitted or stored.
    If someone is telling you to worry about this, I think they are barking up the wrong tree someplace way out in left field.
    There are so many other things that can seriously affect processing speed and data transfer speed, starting with query plans and index usage. I have never heard this one causing concern anywhere before.

  • How do i change datatype to text from number from an excel input file

    I have a simple 2 column excel spreadsheet with 29k rows.
    The 1st column does contain numbers, but are really text and not to be treated as number, so i selected format cells/text and then saved the file as an excel .xls file.
    However whenever i use this data source in crystal, the 1st column/field is always datatype number, and i do not see the text type fields, even if i create a formula totext(datafield)
    .How, or what can i do to the original data source to see both columns as text in crystal ? i have tried saving as .csv.
    i have crystal 12.3.0.601 sp3

    Hi John,
    In Excel if first value i.e. first record value is a number (even though you format as text) it will consider as number.  So, try to make your first record in excel as text field.
    Example :
    123-- takes as number
    '123-- try this --start with a single quote and followed by number.
    or
    A123--This will make this filed as text.
    Thanks,
    Sastry

  • Number datatype to timestamp

    Hi,
    i have date column in the db as datatype Number - 1354874161000 . i want a query to convert this into timestamp. pls help

    APC wrote:
    What sort of timestamp is it?
    It's not an Oracle timestamp rendered as a number because the figures don't match to meaning time elements. Unless the joker who stored the data forgot to pad the parts with leading zeroes, it which case you have absolutely no chance of converting the string into a timestamp with any degree of certainty about the validity of the outcome.
    Cheers, APC:D

  • Number datatype showing exponential value...

    Hi,
    i hav a column phone_no (datatype number) in some database. why it showing the phone no in this format
    PHONE_NO
    9.873E+09
    plz give me solution.

    Hi,
    It looks like the default width for number columns on your system is 9.
    Are you using SQL*Plus?
    If so, you can change the default to 10 (or more) for your session:
    SET  NUMWIDTH 10or you can specifically format that column:
    COLUMN  phone_no  9999999999

  • What is the size of number data type.

    what is the size of number data type (in term of memory storage ;byte ).
    Does it make different in size if mention number(38,0)?
    Thanks all in advance...:)
    Edited by: user10648897 on Jan 7, 2009 6:43 AM

    NUMBER (p,s)
    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.number(38,0) = number(38)
    http://download.oracle.com/docs/cd/B19306_01/server.102/b14196/schema002.htm#sthref472

Maybe you are looking for