BLOCKING_SESSION column of v$session in 10g
Hi. all.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2088.htm#REFRN30223
what does BLOCKING_SESSION column mean?
For example,
SID Blocking_session
500 400
In the above case,
SID 400 is blocking SID 500 ?
or
SID 500 is blocking SID 400?
Thanks and Regards.
Dear Yas.
Thanks for your confirmation.
Best Regards.
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Columns Display Support in Oracle 10g Express Edition..................
I am working with the Oracle 10g Express Edition, and I Created a Table with 52 Fields and even successfully inserted data into the table via Java Program. But the problem is when I am displaying the table from the Oracle 10g Express Edition Interface, it is displaying only first 31 Fields and displaying "<div class="fielddata">First 31 columns displayed.</div>". What should i do if I want to display all the 52 columns. Awaiting for the Reply. Thank You..
duplicate post
Columns Display Support in Oracle 10g Express Edition.................. -
Hi,
I need the output from columns to rows in oracle 10g.
this is my original output using some select query,
select a.created_by,b.modified_by from created_tp a,modified_tp b where a.col_id=b.col_id.
created_by modified_by
Siva Raja
but i need this same output by rows like
user--anything fine
Siva
Raja
Thanks
SivaHi,
select case l when 1 then a.created_by
else b.modified end
from created_tp a,modified_tp b, (select level l from dual connect by level <= 2)
where a.col_id=b.col_id. -
COMMAND column in V$SESSION table
Is there any table which stores all the meaning of various values that can be stored in COMMAND column of V$SESSION table
Like 3 is for SELECT and 47 for Execute, I found some documentation in data dictionary but was wondering if there is some table that can be used when a trigger or procedure is running to pull the values on the fly.
ThxYou can find the various values for V$SESSION.COMMAND in Table 7-5 COMMAND Column of V$SESSION and Corresponding Commands found in the link below to build your own table.
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2088.htm#sthref3985 -
COMMAND column in V$SESSION just show s SELECT
Hi,
i queried command column in v$session, but it shows only 3(which is for SELECT) and 0 (which is for unknown), even i update some thing its not shown.
ThanksHi Pavan,
following is the list for that
Number Command Number Command
1 CREATE TABLE 2 INSERT
3 SELECT 4 CREATE CLUSTER
5 ALTER CLUSTER 6 UPDATE
7 DELETE 8 DROP CLUSTER
9 CREATE INDEX 10 DROP INDEX
11 ALTER INDEX 12 DROP TABLE
13 CREATE SEQUENCE 14 ALTER SEQUENCE
15 ALTER TABLE 16 DROP SEQUENCE
17 GRANT OBJECT 18 REVOKE OBJECT
19 CREATE SYNONYM 20 DROP SYNONYM
21 CREATE VIEW 22 DROP VIEW
23 VALIDATE INDEX 24 CREATE PROCEDURE
25 ALTER PROCEDURE 26 LOCK
27 NO-OP 28 RENAME
29 COMMENT 30 AUDIT OBJECT
31 NOAUDIT OBJECT 32 CREATE DATABASE LINK
33 DROP DATABASE LINK 34 CREATE DATABASE
35 ALTER DATABASE 36 CREATE ROLLBACK SEG
37 ALTER ROLLBACK SEG 38 DROP ROLLBACK SEG
39 CREATE TABLESPACE 40 ALTER TABLESPACE
41 DROP TABLESPACE 42 ALTER SESSION
43 ALTER USER 44 COMMIT
45 ROLLBACK 46 SAVEPOINT
47 PL/SQL EXECUTE 48 SET TRANSACTION
49 ALTER SYSTEM 50 EXPLAIN
51 CREATE USER 52 CREATE ROLE
53 DROP USER 54 DROP ROLE
55 SET ROLE 56 CREATE SCHEMA
57 CREATE CONTROL FILE 59 CREATE TRIGGER
60 ALTER TRIGGER 61 DROP TRIGGER
62 ANALYZE TABLE 63 ANALYZE INDEX
64 ANALYZE CLUSTER 65 CREATE PROFILE
66 DROP PROFILE 67 ALTER PROFILE
68 DROP PROCEDURE 70 ALTER RESOURCE COST
71 CREATE MATERIALIZED VIEW LOG 72 ALTER MATERIALIZED VIEW LOG
73 DROP MATERIALIZED VIEW LOG 74 CREATE MATERIALIZED VIEW
75 ALTER MATERIALIZED VIEW 76 DROP MATERIALIZED VIEW
77 CREATE TYPE 78 DROP TYPE
79 ALTER ROLE 80 ALTER TYPE
81 CREATE TYPE BODY 82 ALTER TYPE BODY
83 DROP TYPE BODY 84 DROP LIBRARY
85 TRUNCATE TABLE 86 TRUNCATE CLUSTER
91 CREATE FUNCTION 92 ALTER FUNCTION
93 DROP FUNCTION 94 CREATE PACKAGE
95 ALTER PACKAGE 96 DROP PACKAGE
97 CREATE PACKAGE BODY 98 ALTER PACKAGE BODY
99 DROP PACKAGE BODY 100 LOGON
101 LOGOFF 102 LOGOFF BY CLEANUP
103 SESSION REC 104 SYSTEM AUDIT
105 SYSTEM NOAUDIT 106 AUDIT DEFAULT
107 NOAUDIT DEFAULT 108 SYSTEM GRANT
109 SYSTEM REVOKE 110 CREATE PUBLIC SYNONYM
111 DROP PUBLIC SYNONYM 112 CREATE PUBLIC DATABASE LINK
113 DROP PUBLIC DATABASE LINK 114 GRANT ROLE
115 REVOKE ROLE 116 EXECUTE PROCEDURE
117 USER COMMENT 118 ENABLE TRIGGER
119 DISABLE TRIGGER 120 ENABLE ALL TRIGGERS
121 DISABLE ALL TRIGGERS 122 NETWORK ERROR
123 EXECUTE TYPE 157 CREATE DIRECTORY
158 DROP DIRECTORY 159 CREATE LIBRARY
160 CREATE JAVA 161 ALTER JAVA
162 DROP JAVA 163 CREATE OPERATOR
164 CREATE INDEXTYPE 165 DROP INDEXTYPE
167 DROP OPERATOR 168 ASSOCIATE STATISTICS
169 DISASSOCIATE STATISTICS 170 CALL METHOD
171 CREATE SUMMARY 172 ALTER SUMMARY
173 DROP SUMMARY 174 CREATE DIMENSION
175 ALTER DIMENSION 176 DROP DIMENSION
177 CREATE CONTEXT 178 DROP CONTEXT
179 ALTER OUTLINE 180 CREATE OUTLINE
181 DROP OUTLINE 182 UPDATE INDEXES
183 ALTER OPERATOR -
How to interprete P* value of v$session in 10g??( event=library cache lock)
Hi, all.
The database is 2 node RAC (10.2.0.2.0) on 32-bit windows 2003 EE SP1.
One session on Node 2 is waiting for "library cache lock" to be released
for "178874" seconds.
The detail for the session is as follows:
SID : 444
TYPE : USER
PROGRAM : ORACLE.EXE(J001)
MODULE : EM_PING
EVENT : library cache lock ▲
WAIT_CLASS : Concurrency
P1TEXT : handle address ▲
P1 : 1206060532 ▲
P1RAW : 47E305F4 ▲
P2TEXT : lock address ▲
P2 : 1108075084 ▲
P2RAW : 420BE24C ▲
P3TEXT : 100*mode+namespace ▲
P3 : 301 ▲
P3RAW : 0000012D ▲
WAIT_IN_SECONDS : 178874
BLOCKING_SESSION : <-- NONE
There is no blocking session in v$lock.
Could you teach me how to interprete P* value of v$session in case of "library cache lock"??
Thanks and Regards.Dear user449027.
Thanks for your reply.
column wevent format a20
column bevent format a20
select
waiter.sid waiter,
waiter.p1raw wlockp1,
waiter.event wevent,
blocker_event.sid blocker,
blocker_event.event bevent
from
x$kglpn p,
gv$session blocker_session,
gv$session_wait waiter,
gv$session_wait blocker_event
where
p.kglpnuse=blocker_session.saddr and
p.kglpnhdl=waiter.p1raw and
(waiter.event like 'library cache lock' ) and
blocker_event.sid=blocker_session.sid
order by
waiter.p1raw,waiter.sid
returns NO rows.
The database is 2 Node RAC db.
Do both instances share "x$kglpn"??
On Node2, sid=444 session is waiting for library cache lock.
I issued the following script.
select kglnaobj, kgllkreq
from x$kgllk x , v$session s
where s.saddr = x.kgllkses
and x.kgllkhdl=s.p1raw
and s.sid = 444;
KGLNAOBJ KGLLKREQ
MGMT_JOB_EXEC_SUMMARY 2
The owner of MGMT_JOB_EXEC_SUMMARY is sysman.
And MGMT_JOB_EXEC_SUMMARY is valid.
I issued "DESC MGMT_JOB_EXEC_SUMMARY".
"DESC MGMT_JOB_EXEC_SUMMARY" hangs.
The sid=444 session is waiting for almost 2 days.
I stopped dbconsole and emagent.
Thanks and Regards. -
About the last_call_et column in v$session
Hello,
Can someone help me about a behaviour that is very strange ...
We have connection about SAS on a database which manipulate Oracle table and others SAS Structure.
The query is a "join" about that table and a "SAS Table" between million of lines in the Oracle table one ....
It last a long time ....
During the query, we have time to see at the v$session table...
At any time (it lasts 3h), we saw that the column 'last_call_et' of the v$session never change : it continuesly stay at 0.
What does it mean ? it means that SAS send a query every second ? Or this column shows the last "internal call"?
If this is the right reason, i would'nt understand why, when i take the same query( launched by SAS) in TOAD, there is no the same behaviour and this behaviuor is in that case the right behaviour : the session is ACTIVE but the last_call_et respresents really the time since i launched the query... So why when SAS do it, the last_call_et stay at 0 ? it works like SAS launch every second this query !!!!
Can someone help me ?
Thanks ...Jonathan Lewis wrote:
user12046632 wrote:
When you say :
A FETCH is a database call :
That means that it must affect the value of 'last_call_et' or not ?"A Fetch is a database call"
"last_call_et" -- certainly sounds like that could be something to do with database calls, perhaps End Time of LAST database CALL.
A parse is also a database call, as is an execute ... I feel that perhaps I was a little too concise with my description. You asked why SAS could be doing lots of calls (although that wasn't exactly how you put the question) and I replied that calls could include fetches. And yes, the last_call_et is reset on every fetch (amongst other things - and ignoring the special behaviour of background processes).Ok
>
(accordint to me, only to user's activity do so and not to "database internal callsl") ! isn't it ?You don't want to believe everything you read on the internet - even if it did come from the online manuals. But a "fetch" is not a "database internal call" anyway, it's a call from a client to the server.Be sure that i don't do so.
But the explanation of Oracle of the term 'cal' is not so precise at all ...
>
Your follonwing explanations seems to answers contrarily ....
But the question is there : what sort of call affetcs the value of "last_call_et"All database calls - which you should read as "all calls from the client to the server".Ok
>
>>
>>
When you say
all_rows plan => parse call, execute call ..... with very long call time, lots of fetch calls
first_rows_n plan => parse call, execute call ... with very short call time, lots of fetch calls
In the first case you would see last_call_et constantly growing until the fetches started
In the second case last_call_et would keep resetting to zero so fast you probably wouldn't see it as a non-zero value.
I don't understand : ok for the conséquences on the timing ... but if there are a lot of fetch call in both cases : the behaviour on the 'last_call_et' has to be equal ?True - but in one case I've included an execute call that is active for a very long time, and in the other I've proposed an execute call that is active for a very short time. (And execute calls are calls, and I did ask you about the exact details of your observations.)Ok
If we consider that every call reset to 0 the value of 'last_call_et',
why, in the case of launching the same request by TOAD, shouldn't i see the reset to 0 when the fetches works (because in TOAD during the whole query, which means since the click on "launching query" to the retrieving of data, the value did not reset to 0) ?
>
>>
When you say
Having said that, I've just run a quick test in SQL*Plus on 11.1.0.6 and 10.2.0.3 to demonstrate this point, and 11g is behaving differently from 10g - in the case where the last_call_et should be growing it stays at zero.
"in the case" : in the case of the v11 or the v10 ?11g
In my case : i'am on a v10.2.0.3 ::: Is there a bug ?Not that I know of.ok. So it is in V11 that you have an incorrect behaviour ....
>>
>
Regards
Jonathan LewisLAST NEWS : we have relaunched the query in SAS and observed that we have the same context of plan in both cases (by SAS en y TOAD) : ALL_ROWS.
Very strange ...
Last question :
Just to be sure : When you talk about "First Rows plan" : it means that the retrieve data are restricted to the first rows encountered
or
it is just the plan of the query which is in "that context" which means that the engine works so although the whole data are retrieved ....
thanks for your return -
GROUP BY: determinstic function column of group by expression 10g vs 11g
The following works in 10g but now fails in 11g.
Simple description: If I create a view of a number and subtract 2 from that number
and I group by the first column and include the 2nd column, it works in 10g and gives "not a group by column" in 11g.
It seems that 10g knew the 2nd column was derived by the first column so grouping by the 1st column gave an automatic pass to the 2nd column.
11g seems to be more strict (though I don't know why, if the 2nd column's function is purely deterministic as you would expect subtracting by 2 would be. Same is true for UPPER())
Is there a reason for this change in behaviour in 11g?
Is there some explicit reason for the change in functionality?
Exact versions and results below
Line: -----
Connected to:
Oracle Database 10g Release 10.2.0.3.0 - Production
SQL> drop view v1;
View dropped.
SQL> drop view v2;
View dropped.
SQL>
SQL> create view v1 as
2 select '0' c1, 0 c2 from dual
3 union all
4 select '1', 1 from dual
5 union all
6 select '2', 2 from dual
7 union all
8 select '3', 3 from dual;
View created.
SQL>
SQL>
SQL> create view v2
2 as select c1, upper(c1) c1u, c2, c2-2 c3
3 from v1;
View created.
SQL>
SQL> select c1, c1u
2 from v2
3 group by c1;
C C
1 1
3 3
0 0
2 2
SQL>
SQL> select c1, c2, c3
2 from v2
3 group by c1, c2;
C C2 C3
1 1 -1
3 3 1
2 2 0
0 0 -2
-- =============================================================================================
Connected to:
Oracle Database 11g Release 11.2.0.1.0 - 64bit Production
SQL> drop view v1;
View dropped.
SQL> drop view v2;
View dropped.
SQL>
SQL> create view v1 as
2 select '0' c1, 0 c2 from dual
3 union all
4 select '1', 1 from dual
5 union all
6 select '2', 2 from dual
7 union all
8 select '3', 3 from dual;
View created.
SQL>
SQL>
SQL> create view v2
2 as select c1, upper(c1) c1u, c2, c2-2 c3
3 from v1;
View created.
SQL>
SQL> select c1, c1u
2 from v2
3 group by c1;
select c1, c1u
ERROR at line 1:
ORA-00979: not a GROUP BY expression
SQL>
SQL> select c1, c2, c3
2 from v2
3 group by c1, c2;
select c1, c2, c3
ERROR at line 1:
ORA-00979: not a GROUP BY expression
Edited by: joriotis on Jul 25, 2011 11:01 AM
Edited by: joriotis on Jul 25, 2011 11:03 AMHi,
Just 4 hours ago, someone else had a very similar question:
Group by fails on ORA-00979
Personally, I consider that a bug in Oracle 10. When you do a GROUP BY on a view, you can't expect the SQL engine to look at the view definition, and determine if one of the columns can be derived from another.
In practice, it's easy enough to add c1u to the GROUP BY clause, or to use MAX (c1u) instead of c1u, to make your query work. -
SECONDS_IN_WAIT column of v$session in 10gr2!!
Hi, all.
Recently, I have found the unbelievale value for SECONDS_IN_WAIT in v$session view. The database is 10.2.0.2.0.
select sid, wait_time, seconds_in_waits,wait_class, event,state from v$session;
SID WAIT_TIME SECONDS_IN_WAITS WAIT_CLASS EVENT
500 0 117874 Cluster gc buffer busy WAITING
In the above example, session 500 is waiting for something for 117874 seconds.
117874 seconds is 32.7 hours(117874/60/60).
Thus, session 500 is waiting for 32.7 hours.
The unit of SECONDS_IN_WAITS column is really "seconds"????
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2088.htm#REFRN30223
Thanks and Regards.Hi, yes the metric is on seconds, you must review the definition for this field on the view, look this.
<br>
<br>
If WAIT_TIME = 0, then SECONDS_IN_WAIT is the seconds spent in the current wait condition.
<br>
<b>
If WAIT_TIME > 0, then SECONDS_IN_WAIT is the seconds since the start of the last wait, and SECONDS_IN_WAIT - WAIT_TIME / 100 is the active seconds since the last wait ended.
</b>
<br>
<br>
<br>
Regards.
<br> -
Incorrect data_length for columns with char semantics in 10g
Hi,
I was going through a few databases at my work place and I noticed something unusual.
Database Server - Oracle 10g R2
Database Client - Oracle 11g R1 (11.1.0.6.0 EE)
Client OS - Win XP
SQL>
SQL> @ver
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
5 rows selected.
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3 CHAR)
B CHAR(3)
C CHAR(3 CHAR) <= why does it show "CHAR" ? isn't "BYTE" semantics the default i.e. CHAR(3) = CHAR(3 BYTE) ?
D VARCHAR2(3 CHAR)
E VARCHAR2(3)
F VARCHAR2(3 CHAR) <= same here; this should be VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 12 <= why 12 and not 3 ? why multiply by 4 ?
T B CHAR 3
T C CHAR 12 <= same here
T D VARCHAR2 12 <= and here
T E VARCHAR2 3
T F VARCHAR2 12 <= and here
6 rows selected.
SQL>
SQL>I believe it multiplies the size by 4, because it shows 16 in user_tab_columns when the size is changed to 4.
When I try this on 11g R1 server, it looks good -
Database Server - Oracle 11g R1
Database Client - Oracle 11g R1 (11.1.0.6.0 EE)
Client OS - Win XP
SQL>
SQL> @ver
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE 11.1.0.6.0 Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
5 rows selected.
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3 CHAR)
B CHAR(3)
C CHAR(3)
D VARCHAR2(3 CHAR)
E VARCHAR2(3)
F VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 3
T B CHAR 3
T C CHAR 3
T D VARCHAR2 3
T E VARCHAR2 3
T F VARCHAR2 3
6 rows selected.
SQL>
SQL>Is it a known bug ? Unfortunately, I do not have access to Metalink.
Thanks,
isotope
Edited by: isotope on Mar 3, 2010 6:46 AMAnurag Tibrewal wrote:
It is just because you have different NLS_LENGTH_SEMANTICS in v$nls_parameter for both the database. It is BYTE in R10 and CHAR in R11.
I cannot query v$nls_parameter in the 10g database. I tried this testcase with the ALTER SESSION and checking with nls_session_parameter in both 10g and 11g. The client is 11g in each case.
The DESCRIBE table looks ok, but the user_tab_column shows size*4.
Testcase -
cl scr
select * from v$version;
-- Try CHAR semantics
alter session set nls_length_semantics=char;
select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
drop table t;
create table t (
a char(3 char),
b char(3 byte),
c char(3),
d varchar2(3 char),
e varchar2(3 byte),
f varchar2(3)
desc t
select table_name,
column_name,
data_type,
data_length,
data_precision,
data_scale
from user_tab_columns
where table_name = 'T';
-- Try BYTE semantics
alter session set nls_length_semantics=byte;
select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
drop table t;
create table t (
a char(3 char),
b char(3 byte),
c char(3),
d varchar2(3 char),
e varchar2(3 byte),
f varchar2(3)
desc t
select table_name,
column_name,
data_type,
data_length,
data_precision,
data_scale
from user_tab_columns
where table_name = 'T';In 10g R2 server -
SQL>
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Linux: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL>
SQL> -- Try CHAR semantics
SQL> alter session set nls_length_semantics=char;
Session altered.
SQL> select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER VALUE
NLS_LENGTH_SEMANTICS CHAR
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3)
B CHAR(3 BYTE)
C CHAR(3)
D VARCHAR2(3)
E VARCHAR2(3 BYTE)
F VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 12 <==
T B CHAR 3
T C CHAR 12 <==
T D VARCHAR2 12 <==
T E VARCHAR2 3
T F VARCHAR2 12 <==
6 rows selected.
SQL>
SQL> -- Try BYTE semantics
SQL> alter session set nls_length_semantics=byte;
Session altered.
SQL> select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER VALUE
NLS_LENGTH_SEMANTICS BYTE
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3 CHAR)
B CHAR(3)
C CHAR(3)
D VARCHAR2(3 CHAR)
E VARCHAR2(3)
F VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 12 <==
T B CHAR 3
T C CHAR 3
T D VARCHAR2 12 <==
T E VARCHAR2 3
T F VARCHAR2 3
6 rows selected.
SQL>
SQL>In 11g R1 server -
SQL>
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE 11.1.0.6.0 Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
5 rows selected.
SQL>
SQL> -- Try CHAR semantics
SQL> alter session set nls_length_semantics=char;
Session altered.
SQL> select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER VALUE
NLS_LENGTH_SEMANTICS CHAR
1 row selected.
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3)
B CHAR(3 BYTE)
C CHAR(3)
D VARCHAR2(3)
E VARCHAR2(3 BYTE)
F VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 3
T B CHAR 3
T C CHAR 3
T D VARCHAR2 3
T E VARCHAR2 3
T F VARCHAR2 3
6 rows selected.
SQL>
SQL> -- Try BYTE semantics
SQL> alter session set nls_length_semantics=byte;
Session altered.
SQL> select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER VALUE
NLS_LENGTH_SEMANTICS BYTE
1 row selected.
SQL> --
SQL> drop table t;
Table dropped.
SQL> create table t (
2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
Table created.
SQL> --
SQL> desc t
Name Null? Type
A CHAR(3 CHAR)
B CHAR(3)
C CHAR(3)
D VARCHAR2(3 CHAR)
E VARCHAR2(3)
F VARCHAR2(3)
SQL> --
SQL> select table_name,
2 column_name,
3 data_type,
4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
8 where table_name = 'T';
TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 3
T B CHAR 3
T C CHAR 3
T D VARCHAR2 3
T E VARCHAR2 3
T F VARCHAR2 3
6 rows selected.
SQL>
SQL>isotope -
Convert rows into columns nad vice versa in 10g
how to convert rows into columns in 10g??
Qwerty wrote:
see below for rows to column case
SQL> WITH t as
2 (
3 SELECT 'US' test_string FROM DUAL UNION
4 SELECT 'AMERICA' FROM DUAL UNION
5 SELECT'HOLLYWOOD' FROM DUAL UNION
6 SELECT 'WASHINGTON' FROM DUAL
7 )
8 select ltrim (sys_connect_by_path(test_string,','),',') test_string
9 from (
10 SELECT row_number() over(order by test_string) rno, test_string
11 FROM t)
12 WHERE connect_by_isleaf = 1 and rownum=1
13 connect by rno = prior rno+1;
TEST_STRING
AMERICA,HOLLYWOOD,US,WASHINGTONI hope you can do it for column to rows now.That's not really rows to columns. That's rows to a column, which is more commonly called string aggregation.
Rows to columns (or pivot) is more like:
SQL> ed
Wrote file afiedt.buf
1 WITH t as
2 (
3 SELECT 'US' test_string FROM DUAL UNION
4 SELECT 'AMERICA' FROM DUAL UNION
5 SELECT'HOLLYWOOD' FROM DUAL UNION
6 SELECT 'WASHINGTON' FROM DUAL
7 )
8 --
9 select max(decode(rn,1,test_string)) as col_1
10 ,max(decode(rn,2,test_string)) as col_2
11 ,max(decode(rn,3,test_string)) as col_3
12 ,max(decode(rn,4,test_string)) as col_4
13* from (select test_string, row_number() over (order by test_string) as rn from t)
SQL> /
COL_1 COL_2 COL_3 COL_4
AMERICA HOLLYWOOD US WASHINGTON
SQL>And columns to rows (or unpivot) is like:
SQL> ed
Wrote file afiedt.buf
1 WITH t as
2 (
3 SELECT 'US' col_1, 'AMERICA' col_2, 'HOLLYWOOD' col_3, 'WASHINGTON' col_4 FROM DUAL
4 )
5 --
6 select col_1 as col from t union all
7 select col_2 from t union all
8 select col_3 from t union all
9* select col_4 from t
SQL> /
COL
US
AMERICA
HOLLYWOOD
WASHINGTONor...
SQL> ed
Wrote file afiedt.buf
1 WITH t as
2 (
3 SELECT 'US' col_1, 'AMERICA' col_2, 'HOLLYWOOD' col_3, 'WASHINGTON' col_4 FROM DUAL
4 )
5 --
6 select decode(rownum,1,col_1,2,col_2,3,col_3,4,col_4) as col
7* from t, (select * from dual connect by rownum <= 4)
SQL> /
COL
US
AMERICA
HOLLYWOOD
WASHINGTON
SQL> -
How to enable AI(accent insensitiv) for one column without changing session
Following is my test SQL:
create table accent_test(col varchar2(10 char);
insert into accent_test values('INDIA');
insert into accent_test values('india');
insert into accent_test values('InDiÄ ');
Following SQL can only enable CI(Case insensitive), but can’t enable AI(accent insensitive):
select *
from accent_test
where NLS_UPPER(col, 'NLS_SORT=GENERIC_BASELETTER') LIKE NLS_UPPER('INDIA', 'NLS_SORT=GENERIC_BASELETTER')
COL
INDIA
india
Upper SQL can’t return the third row ‘InDiÄ’ which includes accent character.
I know following SQL can enable AI by changing the session. However it will change the whole session and other columns in one table:
SQL> ALTER SESSION SET NLS_COMP=LINGUISTIC;
SQL> ALTER SESSION SET NLS_SORT=GENERIC_BASELETTER;
Is there any solution to enable AI for only one column without changing the session?convert(<Any Chinese Character>, 'US7ASCII') will all return same character '?'.might be an matter of using the right characterset:
SQL> select 'ä' str, convert('ä', 'JA16SJIS') converted_str from dual union all
select 'á', convert('á', 'JA16SJIS') from dual union all
select 'â', convert('â', 'JA16SJIS') from dual union all
select 'à', convert('à', 'JA16SJIS') from dual
STR CONVERTED_STR
ä a
á a
â a
à a
4 rows selected. -
Sort by columns once per session
Hi there, I am using apex 3.1 and I have a report generated by a pl/sql function. There are several columns on which the user might sort. Is it possible to reset the sorting preferences when the user logs in? (like: a process running once per session?)
thx in advance
Edited by: 814932 on 23-Nov-2010 08:00You can use the <tt>apex_util.remove_sort_preferences</tt> method (although it is a bit of a blunt instrument). See the Admin guide for more information on user preferences.
To run it once per session, code the call as an Application Process with execution point On New Session After Authentication. -
Auto-increment identity column through procedure in oracle 10g on windows
Hi,
I need identity primary key which should be auto increment before while inserting data into table.
for this i had use sequence and then trigger to increment it.
but now i need to increment it in Procedure, while my procedure is having code to insert data in same table which has primary keyHi,
SNEHA RK wrote:
Hi,
I need identity primary key which should be auto increment before while inserting data into table.
for this i had use sequence and then trigger to increment it.Right. Some database products have auto-increment columns, and they are really handy. Unfortunately, Oracle does not have auto-increment columns. A sequence is an auto-increment object, and it's the right way to automatically generate unique identifiers, but you need to explicity reference the sequence, either in you DML statements, or in a trigger that will automatically fire before a DML statement.
but now i need to increment it in Procedure, while my procedure is having code to insert data in same table which has primary keyAre you saying that you need to increment the sequence, completely aside from INSERTing into the table?
If so, just reference sequence_name.NEXTVAL wherever you want to. In PL/SQL, you can say
SELECT sequence_name.NEXTVAL
INTO number_variable
FROM dual;This works in any version of Oracle, but starting in Oracle 11, you also have the option of referencing te sequence without using dual, or any other table.
I hope this answers your question.
If not, post a complete script that people can run to re-create the problem and test their ideas.
For example:
-- Here are the table and the seqauence that I created:
CREATE TABLE table_x ...
CREATE SEQUENCE ...
-- Here is the BEFORE INSERT trigger I wrote:
CREATE OR REPLACE TRIGGER ...
-- The trigger works exactly how I want it to in statements like this:
INSERT INTO table_x ...
-- So there are no problems (that I know of) with anything up to this point.
-- Now I want to use the same sequence to ...
-- so that when I execute a statement like this
-- then the next time I add a new row to the orginal table, like this
INSERT INTO table_x ...
-- then the contents of table_x should be ... because ... -
Converting Columns to rows in Oracle 10g
Hi
i need hint to convert rows to columns.i had given the data strucure and expected output
Source Table
BU_ID Prod_id total_clients Tot_men Totwomen
101 AAA 85 50 35
101 BBB 40 20 20Expected Output
BU_ID Prod_id Clint_info Values
101 AAA total_clients 85
101 AAA Tot_men 50
101 AAA totwomen 35
101 BBB total_clients 40
101 BBB tot_men 20
101 BBB totwomen 20Thanks
Edited by: Sami on Aug 1, 2012 8:25 PMHi,
Cross-join your table with a Counter Table , a table (or result set, as in the example below) that counts from 1 up to the number of columns you want to unpivot, like this:
WITH cntr AS
SELECT LEVEL AS n
FROM dual
CONNECT BY LEVEL <= 3 -- Number of columns to be unpivoted
SELECT s.bu_id
, s.prod_id
, CASE c.n
WHEN 1 THEN 'total_clients'
WHEN 2 THEN 'total_men'
WHEN 3 THEN 'total_women'
END AS client_info
, CASE c.n
WHEN 1 THEN total_clients
WHEN 2 THEN total_men
WHEN 3 THEN total_women
END AS values
FROM source_table s
CROSS JOIN cntr c
ORDER BY s.bu_id
, s.prod_id
, c.n
;If you'd care to post CREATE TABLE and INSERT statements for your sample data, then I could test this.
The values column that you create can only have 1 data type. If the original, unpivoted columns have different data types, you may need to convert some of them in the CASE expression that defines values.
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