Explanation for V$ view columns....

Hi All,
Is there any data dictionary table or third party tool which explains or has comments on the columns of the V$ views ? i.e. what column shows what info in the V$ views.
The Dict & Dict_columns tables have comments for all the data dictionay tables but not for V$ views.
If anyone knows, please enlighten.
Regards,
Azhar.

The Oracle Database Reference has a chapter on the various dynamic performance views.
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/toc.htm
This, along with all the other Oracle documentation, is available online at http://tahiti.oracle.com
Justin
Distributed Database Consulting, Inc.
www.ddbcinc.com/askDDBC

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Need to know base table and base column name for Oracle view columns

I am trying to load metadata for some views and that requires me to know what the final table and column name would be corresponding to the view column.
For example, if I have a view x_v that is select a,b from x_v2; and x_v2 is a view that is select a,b,c from x;
I need to get the following information.
View View Col Base Table Base Col
X_V A X A
X_V B X B
and so on.
Is it possible to get this programmatically using any SYS schema tables or Dependency tables?
I tried an indirect approach wherein I lock tables using LOCK TABLE or FOR UPDATE OF. But I'm not too sure if I can go down to the level of individual view columns.
Can you help me with this?

Thanks. I was looking at some indirect approaches.
I came up with this script that does it faster than dependencies but thats just for tables and not column mapping.
declare
cursor bt(cp_sid number) is
select u.name uname, o.name oname
from sys.obj$ o, sys.user$ u
where o.obj# in (select id1
from v$lock
where sid=cp_sid)
and u.user# =o.owner#;
cursor c_sid is
select sid
from v$session
where audsid =userenv('sessionid');
l_sid number;
l_view varchar2(100):= 'PER_PEOPLE_V';
l_schema varchar2(10):= 'APPS';
begin
open c_sid;
fetch c_sid into l_sid;
close c_sid;
dbms_output.put_line('SID: '||l_sid);
execute immediate 'lock table '||l_schema||'.'||l_view||' in row share mode nowait';
for i in bt(l_sid) loop
dbms_output.put_line(i.uname||'.'||i.oname);
execute immediate 'alter table '||i.uname||'.'||i.oname||' disable table lock';
execute immediate 'alter table '||i.uname||'.'||i.oname||' enable table lock';
end loop;
end;
It basically uses locks on views to verify locks on the base tables.
Just wondering, can we use FOR UPDATE OF statements to get to the columns?

Data type size for the view column

I am creating a view from base table using substr() for some fields. The data type size of the column in the view becomes twice the size of the corresponding column in the base table. Example
SQL> create table temp_sat(name varchar2(20));
Table created.
SQL> create view temp_view as select substr(name,1,10) name from temp_sat;
View created.
SQL> desc temp_view
Name Null? Type
NAME VARCHAR2(40)
Can i specify the size of the column while creating view

satish asnani wrote:
I am creating a view from base table using substr() for some fields. The data type size of the column in the view becomes twice the size of the corresponding column in the base table. Example
SQL> create table temp_sat(name varchar2(20));
Table created.
SQL> create view temp_view as select substr(name,1,10) name from temp_sat;
View created.
SQL> desc temp_view
Name                                      Null?    Type
NAME                                               VARCHAR2(40)Can i specify the size of the column while creating viewHi,
Which platform and Oracel DB version?
I had try to replicate, but I can't:
SQL> create table t_v
2 (id varchar2(20));
Tabla creada.
SQL> desc t_v
Nombre                                                            ┐Nulo?   Tipo
ID                                                                         VARCHAR2(20)
SQL> r
1 create view v_t_v
2 as
3 select substr(id,1,10) id
4* from t_v
Vista creada.
SQL> desc v_t_v
Nombre                                                            ┐Nulo?   Tipo
ID                                                                         VARCHAR2(10)John

MetaData For Database View Columns How ??

SELECT * FROM user_tabs_columns WHERE table_name = 'EMPLOYEES';
The above query will return column information like data_type, lenght etc for the columns in the EMPLOYEE table, how can one retrieve such information on the columns / fields in a view instead of a table. I have views built from several tables, and I use the data returned from quering the views as records displayed to the user in an AJAX application, using the data-grid widget in the said AJAX library. If the user has rights to edit the records, I need to use specific ajax widgets (like a date widget) to edit a field if the datatype information provided by the database is DATE or DATETIME, if the field is nullable, I can permit the user to enter nothing, and I can restrict input length to the lenght of the column. But since the record is spread across several tables and pulled out from a view, I therfore need a way to get the column information on the said view.
How can this be achieved.
Thanks.
Charles Odili.

You should still be able to use the USER_TAB_COLUMNS view to obtain this information. I did a quick test below:
SQL> create view test as select * from all_objects;
View created.
SQL> select table_name,column_name from user_tab_columns where table_name='TEST';
TABLE_NAME                     COLUMN_NAME
TEST                           OWNER
TEST                           OBJECT_NAME
TEST                           SUBOBJECT_NAME
TEST                           OBJECT_ID
TEST                           DATA_OBJECT_ID
TEST                           OBJECT_TYPE
TEST                           CREATED
TEST                           LAST_DDL_TIME
TEST                           TIMESTAMP
TEST                           STATUS
TEST                           TEMPORARY
TEST                           GENERATED
TEST                           SECONDARY
13 rows selected.
SQL> spool off;

Column definition for a specific column in a view

Is there a way to query the metadata to get the definition of a single column in a view? I can see the complete DDL for a view from USER_VIEWS.TEXT, and I can see the column listing in USER_TAB_COLUMNS to give the datatype etc. However, what I'm looking for is the DDL that defined a specific column.
So, given:
create table PERSON (
SSN VARCHAR2(12),
FIRST_NAME VARCHAR2(25),
LAST_NAME VARCHAR2(25),
STREET VARCHAR2(40),
CITY VARCHAR2(30),
STATE VARCHAR2(30),
ZIP VARCHAR2(15),
COUNTRY VARCHAR2(35))
create view PERSON_VW as
select SSN,
FIRST_NAME,
LAST_NAME,
FIRST_NAME || ' ' || LAST_NAME FULL_NAME
from PERSON
I expect the query might look something like:
select DDL from metadata where table_name = 'PERSON_VW' and column_name = 'FULL_NAME'
and the result would be: "PERSON.FIRST_NAME || ' ' || PERSON.LAST_NAME"
or select DDL from metadata where table_name = 'PERSON_VW' and column_name = 'FIRST_NAME'
and the result would be: "PERSON.FIRST_NAME"
Thanks!

>
Hi again Barry,
When I queried user_tab_columns (or dba_tab_columns or all_tab_columns), I have the following list of columns:
TABLE_NAME
COLUMN_NAME
DATA_TYPE
DATA_LENGTH
DATA_PRECISION
DATA_SCALE
NULLABLE
COLUMN_ID
DEFAULT_LENGTH
DATA_DEFAULT
I don't see anything resembling the DDL for the view column. Somewhere underneath some
cover I haven't peeked under, Oracle must be keeping track of what it is supposed to be giving
for, in my example, FULL_NAME.Unless I'm very much mistaken, these columns' data (per table) looks pretty much like DDL to me.
Maybe what you need is just SQL Developer (great tool, if you don't have it, get it!).
And it's free (as in beer - not as in speech! :( )
Beside the connections tab is a "Reports" tab with various, as you might expect ;), reports.
One of them is on the Tables - with (some) DDL. This will work as a once-off if that's what
you need?
Otherwise there's the SQL tab if you open a table under connections - it's very complete - sample
at bottom of post.
HTH,
Paul...
(Ultimately, I'm diagnosing problems in existing databases that have views already created so
I don't have the option of considering virtual columns.)Quelle surprise ;(
Paul...
-Barry
CREATE TABLE "HR"."COUNTRIES"
    "COUNTRY_ID"   CHAR(2 BYTE) CONSTRAINT "COUNTRY_ID_NN" NOT NULL ENABLE,
    "COUNTRY_NAME" VARCHAR2(40 BYTE),
    "REGION_ID"    NUMBER,
    CONSTRAINT "COUNTRY_C_ID_PK" PRIMARY KEY ("COUNTRY_ID") ENABLE,
    CONSTRAINT "COUNTR_REG_FK" FOREIGN KEY ("REGION_ID") REFERENCES "HR"."REGIONS" ("REGION_ID") ENABLE
ORGANIZATION INDEX NOCOMPRESS PCTFREE 10 INITRANS 2 MAXTRANS 255 LOGGING STORAGE
    INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT
TABLESPACE "USERS" PCTTHRESHOLD 50;
COMMENT ON COLUMN "HR"."COUNTRIES"."COUNTRY_ID"
IS
'Primary key of countries table.';
COMMENT ON COLUMN "HR"."COUNTRIES"."COUNTRY_NAME"
IS
'Country name';
COMMENT ON COLUMN "HR"."COUNTRIES"."REGION_ID"
IS
'Region ID for the country. Foreign key to region_id column in the departments table.';
COMMENT ON TABLE "HR"."COUNTRIES"
IS
'country table. Contains 25 rows. References with locations table.';

In user_tab_cols the data_type is 'undefined' for view columns

Can anyone please confirm if this is the correct behaviour ?
select table_name, column_name, data_type from user_tab_cols
where table_name = 'AR_RCT_CUST_H_V'
AR_RCT_CUST_H_V     RCT_CUST_ACCOUNT_NUMBER     UNDEFINED
AR_RCT_CUST_H_V     RCT_CUST_TYPE     UNDEFINED
AR_RCT_CUST_H_V     RCT_CUST_ACCOUNT_ID     UNDEFINED
This view ( AR_RCT_CUST_H_V ) is created using force view command.
Also which table can I query to see the correct datatype for the view columns ?
database version : 11.1.0.6.0
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user809921 wrote:
I got 3 tables
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>> The issue just starts happening this week and there is no mass changes in data.
There might be a mass changes in the execution plan for several reason without mass changes in data
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>> The problem only occur if the query is issued from an IIS application but not from SSMS.
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We need to see the DDL+DML+Query and both execution plans
>> What does the Parse Tree row mean
I am not sure what you mean but the parse tree represents the logical steps necessary to execute the query that has been requested. you can check this tutorial about the execution plan: https://www.simple-talk.com/sql/performance/execution-plan-basics/ or
this one: http://www.developer.com/db/understanding-a-sql-server-query-execution-plan.html
>> regarding the usecount column or any other column check this link:
https://msdn.microsoft.com/en-us/library/ms187404.aspx?f=255&MSPPError=-2147217396.
Ronen Ariely
[Personal Site]    [Blog]    [Facebook]

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