System Generated Constraints
Jul 5, 2012
I was wondering with dba_constraints and i found unexpected result shown as below
select constraints_name, constraint_type from dba_constraints
constraint_name constraint_type
SYS_C00141 c
SYS_C00142 c
SYS_C00143 c
SYS_C00144 c
SYS_C00145 c
SYS_C00146 c
SYS_C00147 c
SYS_C00148 c
SYS_C00149 c
i jst want to know that what is this system generated constraints ?
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May 14, 2007
Lets say you're making upa school database and you awnted to give the students each a unique student number generated by thesystem.
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Jun 13, 2012
I want to create a store procedure to copy data from a source tables(which may not have any constraints defined) to a table which has primary key, foreign key and unique key constraints.
Any records which are rejected due to these constraints not being satisfied need to go another table.
Once the initial data load is done, these procedures need to be automated(through cron) to do the future incremental uploads in the same manner.
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Apr 1, 2012
We have system.current_item and system.cursor_item.....
both represent the same....
like this we have few other system variables also .....
what is the main difference between current_item and cursor_item?
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Aug 21, 2012
couple of questions about below parameters, do they measure single processor or avg usage across all processorss and cpus for example will i recieve alert if CPU system time goes above 95% for single processors? or not
CPU Idle Time (%)
CPU System Time (%)
CPU User Time (%)
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Dec 3, 2010
The trace directory is full of trc files with the text below:
--------Dumping Sorted Master Trigger List --------
Trigger Owner : INPUT
Trigger Name : CUS_TST
--------Dumping Trigger Sublists --------
There is like a file generated every minute, and i cant stop it from happening.I have tried setting the trace_enabled parameter to FALSE but no success.
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Oct 9, 2012
i just noticed on my 11g database - no AWR snapshots are generated.
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May 15, 2011
Forms 10g is insatalled recently on my machine. New form is developed,when we run the form it generates FMX file for the same but output is not dispalyed. The output window get closed automatically.
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Nov 5, 2010
in eache record we are receiving information from differente city, we pretend to get an output where we have a row for each city (delimited by comma) that we have in column CITY
Input data
SELECT '1001001' as CLIENT_ID, 'LONDON, PARIS' as CITY, TO_DATE('20101105', 'YYYYMMDD') as DT_REG FROM DUAL UNION
SELECT '1022201' as CLIENT_ID, 'MADRID, OSLO' as CITY, TO_DATE('20101105', 'YYYYMMDD') as DT_REG FROM DUAL UNION
SELECT '1033001' as CLIENT_ID, 'PARIS' as CITY, TO_DATE('20101105', 'YYYYMMDD') as DT_REG FROM DUAL UNION
SELECT '1033004' as CLIENT_ID, 'MADRID, OSLO, PARIS' as CITY, TO_DATE('20101105', 'YYYYMMDD') as DT_REG FROM DUAL
Output expected
CLIENT_IDDT_REGCITY
100100105/11/2010 LONDON
100100105/11/2010 PARIS
102220105/11/2010 MADRID
[code]...
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Mar 29, 2010
How to find out how much undo will be generated by a dml / ddl statement in Oracle 9i? With Oracle 10g we can use the famous mystat.sql and mystat2.sql with argument as 'undo change vector size'.
However with Oracle 9i there is no statname as 'undo change vector size'
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Feb 7, 2013
Is there any way to get the amount of redo generated in last 2 hour. which has below chareteistic
1. redo generated by currently connected session from last 2 hour.
2. redo generated by session disconnected during last 2 hour.
total_redo = disconnected sessoin during last 2 hour + connected session generating redo during last 2 hour.
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Jul 2, 2012
in our database 10.0.2.4 with RAC archive log generated each 4 min , did this increase the performance of database and how i can fix it
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Jun 6, 2011
I am facing issue with my sequence number about sequence number generated..I want it to follow the sequence all the time, i.e. it should take next incremental number to last generated seauence, but it generates random one all the time, i.e
s.nextval() = 4
s.nextval() = 5
s.nextval() = 10
s.nextval() = 543
s.nextval() = 544
My sequence defination is as below
CREATE SEQUENCE s
START WITH 1
MAXVALUE 999999999999999999999999999
MINVALUE 1
NOCYCLE
CACHE 20
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Feb 25, 2008
How do know all the constraints that are present on the data in a table in oracle ??
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Nov 1, 2013
I want to display columns along with their constraints using describe command
Is it possible?
SQL> desc dept;
Name Null? Type
----------------------------------------- -------- -------------
DEPTNO NUMBER(2)
DNAME VARCHAR2(14)
LOC VARCHAR2(13)
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Mar 7, 2010
Basically, I need to fulfil the constraint:
"student cannot have more than 100 points"
I need to use a trigger to do this, but I don't understand how this would work.
Written in plain english I imagine it work work something like:
AFTER UPDATE
WHERE student.lessonid = lesson.lessonid
IF SUM(lesson.points) > 100 then ROLLBACK
lessonid is the only field relating the two tables.
--
How to fulfill that criteria, whether it be using triggers or not.
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Mar 21, 2011
How to create any constraints other than NOT NULL in PLSQL RECORD.
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Mar 5, 2012
Ive created a scenario to what im trying to achieve here so ignore how its set-up attribute wise.
CREATE TYPE object_obj AS OBJECT (
obj_id NUMBER,
NAME VARCHAR2(20),
age NUMBER) NOT FINAL;
/
CREATE TYPE object_ext UNDER object_obj (
course_name VARCHAR2(20));
/
CREATE TYPE object_ext2 UNDER object_obj (
location VARCHAR2(20);
/
CREATE TABLE object_tab OF object_obj(obj_id PRIMARY KEY);
/
Now for the course_name i need to make sure it can only be on of these three values ('Science','Math','English'). I can't find a way to apply this constraint without making a table. But then that creates another issue of how to insert the data from the main supertype (object_obj) and i only want the object_tab table and view the subtypes via a select query.
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Aug 23, 2013
When a table structure is copied from another table.What are the constraints copied and why?Unique keyPrimary keyForeign KeyCheckNot null.
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Sep 14, 2010
i have faced one problem with reports. i had created 4 reports. recently we are designed new application using oracle forms6i. we are created more than 10 forms and added to application they were working fine. but when i was added these reports they are not generated. but in server report are running. i mean the report genereted in server but not in local system.
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Sep 6, 2010
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup plus archivelog command at 09/06/2010 12:36:47
ORA-19715: invalid format F for generated name
ORA-27302: failure occurred at: slgpn
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Nov 2, 2012
I have found there is a wearied of email generated from my database. I have the data base server located in US (estern time) and the sysdate in the database is AUSTRALIA (AEST). But i am working from India (IST).I have one procedure, which will send email to some recipients once the job is done. It is using UTL_SMTP for sending the email from database.
Now problem is, the email i got from this procedure has a different timestamp which is NOT matching to any of the times:
Time in Mail : 2-Nov-2012 9.56 PM
IST Time : 2-Nov-2012 10.56 AM
Easter Time : 2-Nov-2012 01.30 AM
AEST Time : 2-Nov-2012 4.30 PM
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Jul 19, 2010
Is there a way to show the sql statements generated by the Forms?
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Dec 17, 2012
As we know that, MV is generating more redo logs during the FAST refresh. but i need more clarifications on that.
see the below examples:
exec dbms_mview.REFRESH ( LIST => 'mv_test', method=>'F');
PL/SQL procedure successfully completed.
select a.name, b.value
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and a.name = 'redo size';
NAME VALUE
---------------------------------------------------------------- ----------
redo size 147144
see the redo size is 147144 bytes. Immediately, i refreshed in MV view. now there is no update or insert or delete stats happened in source tables. but i do see redo log generation is high for NO DATA refresh.
select a.name, b.value-147144
from v$statname a, v$mystat b
where a.statistic# = b.statistic#
and a.name = 'redo size';
NAME VALUE
---------------------------------------------------------------- ----------
redo size 42352
For no rows refresh, it takes 42352 bytes.. why oracle generated redo logs when there is no DML operations happened in source table.
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May 8, 2012
We are using the function dbms_utility.get_hash_value to create a unique identifier, the hash is created based on statement of creating an index. We see that for a different statement is being generated the same value, which in this cause errors because this value must be unique.
The Hash is to be calculated as follows HASH_VALUE = dbms_utility.get_hash_value (sql_text, a 10000)
We are using the correct the hash function or should we use another way to generate unique values?
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Nov 4, 2011
My need is to view sql statement and its explain plan generated by client (Business Objects). How do I perform it? Since it's developer's server I have sufficient rights, I just don't know particular table name.
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Jan 25, 2013
Customer is running a Job from a Schema which is generating multiple sessions . I want the all the sessions to be traced from that particular Schema .
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Feb 8, 2013
I have a problem with Dynamic SQL.
I have written an SQL which will dynamically generate the Select statement with from and where clause in it.
But that select statement when executed will get me hundreds of rows and i want to insert each row separately into one more table.
For that i have used a ref cursor to open and insert the table.
In the select list the column names will also be as follows: COLUMN1, COLUMN2, COLUMN3,....COLUMNn
find below the sample code:
TYPE ref_csr IS REF CURSOR;
insert_csr ref_csr;
v_select VARCHAR2 (4000) := NULL;
v_table VARCHAR2 (4000) := NULL;
v_where VARCHAR2 (4000) := NULL;
v_ins_tab VARCHAR2 (4000) := NULL;
v_insert VARCHAR2 (4000) := NULL;
v_ins_query VARCHAR2 (4000) := NULL;
[Code]...
How to fetch the column names here
|| ');';
EXECUTE IMMEDIATE v_ins_query;
END LOOP;
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Oct 19, 2006
After creating all the tables and the constraints, and inputting data to the table.. i want to delete everything. i try using drop table but it doesn't get rid of the constraints.
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Jul 1, 2010
I would like to print all the constraints on all columns given a table name.
Example:
SQL>@constrnts
Enter Table Name: emp
empno ---- Primary key
deptno ---- foreign key references Dept(deptno)
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