Oracle 10.2 g-lack of number sequences
We have identified some numbers were dropped generated by Oracle 10.2 g sequence features. Sequences were ongoing for most of the time, however, we witness a few gaps that occur randomly at times. This has happened in three of our tables. For an example that has only about 80 000 entries between sequences of ID from 800 000 to 900,000. Sequence jumped no permanently several times.Is this a known problem or is there another way, that this can happen?
Code sequence:
create sequences CASE_SEQ
MinValue 1
MaxValue 999999999999999999999999999
Start with 966251
Increment 1
NoCache;
Published by: user9276811 on April 4, 2011 02:02
Look at the configuration of the cache of your sequences.
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:369390500346406705
Tags: Database
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Hi people,
Please review below,
SQL> select * from v$version; BANNER Have a Identity column created. Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production PL/SQL Release 12.1.0.1.0 - Production CORE 12.1.0.1.0 Production TNS for 64-bit Windows: Version 12.1.0.1.0 - Production NLSRTL Version 12.1.0.1.0 - Production SQL> @1; TABLE_NAME COLUMN_NAME GENERATION IDENTITY_OPTIONS -------------------- --------------- ---------- -------------------------------------------------- IDENTITY_TEST_1 ID ALWAYS START WITH: 1, INCREMENT BY: 1, MAX_VALUE: 9999999 999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N , CACHE_SIZE: 20, ORDER_FLAG: N SQL> @1; TABLE_NAME SEQUENCE_NAME -------------------- ------------------------------ IDENTITY_TEST_1 ISEQ$$_92327 Trying to alter Cache value of sequence. from SYSDBA SQL> alter sequence ISEQ$$_92327 CACHE 1000; alter sequence ISEQ$$_92327 CACHE 1000 * ERROR at line 1: ORA-02289: sequence does not exist From Owner Schema Error starting at line 4 in command: alter sequence ISEQ$$_92327 CACHE 1000 Error report: SQL Error: ORA-32793: cannot alter a system-generated sequence Altering was not an option.
By default oracle set Cache size to 20 for the internal sequence implicitly created as part of the identity column.
Suppose that a scenario were we now upgrade the value of the sequence Cache to avoid performance problems (line cache lock wait event!).
Is it possible to change the sequence of the underlying If yes how?
If NOT then no solution to workaround or Expert thought about even?
Thank you
Deepak M.
The ALTER TABLE command.
CREATE TABLE t1 (id NUMBER GENERATED ALWAYS AS IDENTITY, description VARCHAR2(30)); table T1 created. select * from user_tab_identity_cols where table_name = 'T1'; TABLE_NAME COLUMN_NAME GENERATION_TYPE SEQUENCE_NAME IDENTITY_OPTIONS ---------- ----------- --------------- ------------- ------------------------------------------------------------------------------------------------------------------------------------ T1 ID ALWAYS ISEQ$$_96257 START WITH: 1, INCREMENT BY: 1, MAX_VALUE: 9999999999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N, CACHE_SIZE: 20, ORDER_FLAG: N alter table t1 modify id generated always as identity (INCREMENT BY 10 CACHE 100); table T1 altered select * from user_tab_identity_cols where table_name = 'T1'; TABLE_NAME COLUMN_NAME GENERATION_TYPE SEQUENCE_NAME IDENTITY_OPTIONS ---------- ----------- --------------- ------------- ------------------------------------------------------------------------------------------------------------------------------------- T1 ID ALWAYS ISEQ$$_96257 START WITH: 1, INCREMENT BY: 10, MAX_VALUE: 9999999999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N, CACHE_SIZE: 100, ORDER_FLAG: N
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I want to output sequence as below
SQL > SELECT ID FROM (SELECT level as the id FROM dual connect by level < 20) WHERE id BETWEEN 8 AND 19.
ID
--------------
8
9
10
11
12
13
14
15
16
17
18
19
12 selected lines.
Y at - it all another way to achieve the same result.
Thanks in advance.
concerningHello
CONNECT is the best way. It is not more complicated than the others, always at least as fast, sometimes much more quickly.
If the output does not 1, then it might be a bit more efficient to add a constant, rather than generate many kinds you want:
SELECT LEVEL + 7 AS id FROM dual CONNECT BY LEVEL <= (20 - 8) ;
In Oracle 8 (and earlier versions), this kind of CONNECT BY query did not work. People had to SELECT ROWNUM of a real table or view, for example object, which usually included at least 500 lines:
SELECT ROWNUM + 7 AS id FROM all_objects WHERE ROWNUM <= (20 - 8) ;
If there is no doubt that all_object had the same number of rows you need numbers, your could square of this:
SELECT ROWNUM + 7 AS id FROM all_objects , all_objects WHERE ROWNUM <= (20 - 8) ;
From Oracle 10, you can use model. Features XML to do this became available at the same time.
From Oracle 11.2, you can use a recursive subquery in the WITH clause.
Published by: Frank Kulash, April 21, 2011 09:05 -
Number sequence for the value in the column group
I need to create a sequnece number in a column from 5, and incrementing 5, based on the presenet values in the first column. If the value in the first column changes then the sequence would start with 5 and an increment of 5.
for example: I want to generate the following output
Cat_code Seq_No
1001 5
1001 10
1001 15
1001 20
5 2001
10 2001
15, 2001
3001 5
10-3001
4001 5
4001 10
4001 15
4001 20
5001 5
6001 5
5 7001
7001 10
7001 15
7001 20
7001-25
So if the cat_code changes, the sequence number should still start at 5 and should be to generate the sequence number until the cat_code changes again.
any help apreciated.
Thank you
RahulHi, Rahul,
You can use the analytical function of the ROW_NUMEBR to generate the numbers, like this:
SELECT cat_code , 5 * ROW_NUMBER () OVER ( PARTITION BY cat_code ORDER BY NULL ) AS seq_no FROM table_x ORDER BY cat_code , seq_no ;
You must use an ORDER byclause of Analytics when you call ROW_NUMBER. If you don't really care the order, so you can ORDER BY a constant, but you still need the analytical ORDER BY clause.
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Oracle vs response column Format DOUBLE NUMBER/INTEGER
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$sysmanager
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OM profile option: method of invoice numbering works at the level of the Site and there are two values by this profile options - delivery name and automatic.
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Best regards, please rate.
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https://dev.MySQL.com/doc/refman/5.0/en/information-schema.html
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Thank you!
Select dbms_metadata.get_ddl ('SEQUENCE', 'COURSE_NO_SEQ') of double;
Hello
No it will not give the sequence. This u give query will be, how U created the sequence, I mean how u written code for the design of this sequence. That's all...
After you generate the query, you can use it in another schema, if the sequence is not available with this same name. After you have compiled successfully in other patterns, this sequence will start to give the starting number sequence number...
See you soon!
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Hi all
I have a requirement like this
1. in my Oracle database, I have a column Number type (38,10)
2. According to the requirement of user I want to store the numbers as 12.450000 as it is.
When this number (12.450000) gets into the system, it is automatically converted to 12:45, but I still need the user entered number
For example, one tell me a solution for this
Thank you
PadmaPadma says:
HelloDon't say unnecessary things. If you do not know the answer just better be quite.
Why do you think that the answers of FlyingGuy was not necessary or that he did not know the answer.
He was be truthful. Mathematically there is no difference between 1.0, 1.0000, 1.000000000000 etc.
If the numbers are numbers so they must be stored as numbers. If a "user" must be able to see a number with a certain number of digits after the decimal point, so this has nothing to do with the way the data is stored on the database, but is rather a UI issue, such that the interface needs to format the number to a varchar2 for exhibition purposes (using for example TO_CHAR (numbercol ((, 'fm990.0000000000')) so that the correct number of digits after the decimal point are shown. A user cannot reasonably hope that if they enter 0 5 leak so when they see the data once again, it will have 5 0 leak or if they get 10 completed 0 it appears again with 10 end of 0. It's not how to work the numbers and not how they should be stored in the database.
* with moderators hat on * please show more respect for people who are trying to give you the correct answers. Just because you didn't understand the answer only gives you the right to be offensive to people. * Moderators hat off *.
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