11.2.0.3 EVENTS: Null(blank) or called a 'null event' See link. Checked the docs. I don't see anythingI think a null (blank) is for an idle wait since per the V$ACTIVE_SESSION_HISTORY spec these are not record. Am I correct?What is a 'null event'. I see a paper from Oracle magician dating to 9i that says this is an 'oracle goof'. Descriptions of Wait Events
View 5 RepliesBelow given is the sample data
SELECT *
FROM
(
SELECT 1 ORDR_ID, TO_DATE('01-JAN-2012', 'DD-MON-YYYY') INWD_DATE, 5 SIZE_, 'APD' Colr_CD FROM DUAL UNION ALL
SELECT 1 ORDR_ID, TO_DATE('15-JAN-2012', 'DD-MON-YYYY') INWD_DATE, NULL SIZE_, 'KPD' Colr_CD FROM DUAL UNION ALL
SELECT 1 ORDR_ID, TO_DATE('16-JAN-2012', 'DD-MON-YYYY') INWD_DATE, NULL SIZE_, 'ALD' Colr_CD FROM DUAL UNION ALL
SELECT 2 ORDR_ID, TO_DATE('02-JAN-2012', 'DD-MON-YYYY') INWD_DATE, 9 SIZE_, 'APD' Colr_CD FROM DUAL UNION ALL
SELECT 2 ORDR_ID, TO_DATE('05-JAN-2012', 'DD-MON-YYYY') INWD_DATE, 10 SIZE_, '' Colr_CD FROM DUAL UNION ALL
[code]....
Where every first row is the initial entry for an order and following rows are the changes done to the order with modification date
And the expected output is
ORDR_ID Start_date End_date SIZE_ COLR_CD
1 01-01-12 01/15/2012 5 APD
1 01/15/2012 01/16/2012 5 KPD
1 01/16/2012 00-01-00 5 ALD
2 01-02-12 01-05-12 9 APD
2 01-05-12 01-06-12 10 APD
[code]....
I cam use a select statement within select, but wanted to write an efficient SQL...
I'm using
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0
Server:
Windows 2008 R2 x64
Oracle Database 11g Release 11.2.0.1.0 Standard Edition
I recently applied the Oracle® Database Server Version 11.2.0.1 Patch 16 I have several databases running on this box with the same application.Since then I've had lots of customers complaining about slow systems. The server has plenty of RAM availableI also have several other servers all on the same versions, same patch, running the same application with no issues.
Looking at v$session there are often lots of active sessions that have a sql_address of "00". I've never seen this before and I regularly look at v$session, as you can see for below these have been running for a while. The sessions do drop off but I am at a loss as to what is happening.
select username, last_call_et, sid, serial#, user#, status, sql_address, sql_hash_value
from v$session
where username is not null and status = 'ACTIVE'
order by last_call_et desc, sid
[code]...
I´m monitoring a 11g database with OEM. I have a couple of questions regarding the Average Active Sessions chart:
- What does the line 'CPU core' means? The DB is running in a virtual server with 8 CPUs. However, the line 'CPU core' is in 1. Does it mean that Oracle is just using 1 CPU?
- What represents the '99th percentile' line? The chart shows several sessions above that line, something is not working well, isn't it?
i am getting error when iam starting enterprise manager GUI dbcosole,its not displaying the graphs of HOST CPU and active session graphs instaed its giving me error such as java.lang error and null point error below the graphs.
i stop and start the dbconsole from services and from command prompt and rebooted the server,but still showing the same error..did open in other kernals such as mozilla and google still the same issue..
Can I extract data from our Oracle server regarding the no. of sessions per day? But the problem is that our Boss wants a previous dates from April 11-17, 2011.
View 4 Replies View RelatedI have a problem with a statement that normally execute in few second but after 50h the session is still active and is still waiting for null event.
V$session_wait
EVENT WAIT_TIME SECONDS_IN_WAIT STATE
---------------------------------------------------------------- ---------- --------------- -------------------
null event -1 178737 WAITED KNOWN TIME
V$session
SID STATUS PROGRAM LAST_CALL_ET
---------- -------- ------------------------------------------------ ------------
364 ACTIVE f90runm@CENTRAL1 (TNS V1-V3) 178737
My Oracle version : Oracle9i Enterprise Edition Release 9.2.0.2.0 - 64bit Production
System version : HP-UX V1
I tried tracing the session but no trace file is generated it same there is no activity.
I am getting starting with rac environments. I need to configure a two nodes active/active with rac and I need to know if always using rac both nodes will be active or if I have to do that at some point when installing. I have reading some docs from oracle and others authors about rac and its configuration process but that is not understood for my yet.
View 5 Replies View RelatedWe are using oracle as database in our application. For high availability we have a cluster of multiple nodes and the data is replicated using oracle streams. All the nodes in the cluster are active. We do not have any concept of stand-by.
Now we are planning to use oracle RMAN for backup and recovery. RMAN user's guide doesn't recommend any strategies for such deployments. It mainly focuses on primary/stand-by deployments.
I have an urgent requirement to kill an existing session if a new session starts for the same user. I have been reading lot of blogs and posts on the above topic, but could clearly tell me how to do it.
I thought of putting a process in 101 page when login button is pressed to catch this and kill the old session.
We are using Apex 4.0/Oracle 10gR2/ Hp-Ux, We noticed that there is a process Running in Two Sessions that seems running since 3 Hours using 60% CPU,** 30% given below sql it executes in two Sessions!
declare function x return boolean is begin -- if instr(upper(:F4000_P4651_PLUG_SOURCE),'ORDER BY')>0 then
declare
l_position number := 0;
begin
loop
l_position := instr(upper(:F4000_P4651_PLUG_SOURCE),'ORDER BY ',l_position + 1) ;
exit when instr(upper(:F4000_P4651_PLUG_SOURCE),'ORDER BY ',l_position + 1) = 0 ;
[code]....
I have the following query:
select col_1,col_9 from
book_temp b
where b.col_1 is not null
order by to_number(b.col_16)
;
What I want to add is the following:
COL_9
=====
NULL
A
B
NULL
C
D
E
F
NULL
G
I need to connect the NON-NULL rows to the preceding NULL row.
Instead of giving permission directly to v$session and gv$session to a developer, Is there any other way to do the same?
View 3 Replies View Relatedi want to write, just ONE trigger that handles all DMS events at schema level and writes the field changes to a specific log table. i wanna to write like 'FOR EACH FIELD' as for each row (& also each table). it turns in the fields section and if the 'old' and 'new' values isnt same, it triggers this function & writes changes to log.
ex. is like:
FOR EACH ROW
FOR EACH FIELD
if (old.value != new.value)
insert into LOG(..., old.name,new.name) values (..., old.value, new.value)
NEXT // FIELD
NEXT // ROW
I have a table with around half a million rows. I would like to determine how many sequential events occur per device per unique group of events. The requirement is that the events continue to occur within 1 second of each other, every second, with no gaps. For example, in the sample below there is a sequence of 2 events for device 2737, and another sequence of 5 events for device 2737. If there was a 1 second interval with no event (Signal_time) then that would be the end of one group of events, this is also shown below.
Using Oracle 11.2.0.2.0
DEVICE_ID SIGNAL_TIME
4401 17-JUN-12 12.59.59 PM
2332 02-MAY-12 12.59.59 PM
1086 30-MAY-12 12.59.58 PM
2737 17-JUN-12 12.59.58 PM -- start of one group / sequence of events
2737 17-JUN-12 12.59.58 PM -- end of one group / sequence of events
[Code]...
-- start of one group / sequence of events
2737 16-JUN-12 11.59.59 PM
2737 16-JUN-12 11.59.59 PM
2737 17-JUN-12 12.00.00 AM
2737 17-JUN-12 12.00.01 AM
-- end of one group / sequence of events
2737 17-JUN-12 12.00.03 AM
-- this is excluded from the above group of 5 events, but this may be the start of another group
Required output
Device--Count(*)--Start_Signal_Time-----------End_Signal_Time------------Duration (seconds)
2737----5-------------16-JUN-12 11.59.58 PM---17-JUN-12 12.00.01 AM--4
2737----2-------------17-JUN-12 12.59.58 PM---17-JUN-12 12.59.58 PM--1
I am running a GROUP BY query on a few columns of enumerated data like:
select count(*), Condition, Size
group by Condition, Size;
COUNT(*) CONDITION SIZE
-------- ---------- --------
3 MINT L
2 FAIR L
4 FAIR M
1 MINT S
Well, let's say I also have a timestamp field in the database. I cannot run a group by with that involved because the time is recorded to the milisec and is unique for every record. Instead, I want to include this in my group by function based on whether or not it is NULL.
For example:
COUNT(*) CONDITION SIZE SOLDDATE
-------- ---------- -------- ----------
3 MINT L ISNULL
2 FAIR L NOTNULL
2 FAIR M NOTNULL
2 FAIR M ISNULL
1 MINT S ISNULL
I have a table which has a not null column. the column is date field. I am trying to change it to Null. But it is giving a error.
I am using below query.
ALTER TABLE T_test
modify (paid_to_date null)
In my awr reports I have CPU time(in seconds) as one of top 5 timed events.Does that mean oracle is waiting for my cpu to execute the statements.But my cpu usage is 0-10% always
View 4 Replies View RelatedI have a table with 2 defined FK constraints which fires delete cascade events.
I want to deny deletions when the event is fired from one of the tables and permit them when the event is fired from the other table.
Is it possible?
Is any way to solve which table fires the event?
One fo my Db having reliable message as top first timed events.
Event Waits Time(s) Avg wait (ms) % DB time Wait Class
reliable message 685,139 24,625 36 29.58 Other
I am trying to create a trigger to stop events from being deleted if the date is before the current date. This is the SQL syntax for my table
CREATE TABLE event
(event_id numeric(5) not null,
concert_id numeric(5) not null,
event_date date,
);
What I have attempted so far is:
CREATE OR REPLACE TRIGGER event_deleting
BEFORE DELETE ON event
FOR EACH ROW
BEGIN
IF DELETING THEN
[code]......
This gives me a few warnings, the first is that a DECLARE is missing and the second is a INTO is missing.
registration forms for events (like Technology days and so on) with Apex? I want to build up something like that where customers can register for several events.
What is needed:
registration form with a limited registration (e. g. 80 customers) e. g. create a trigger?
show how many seats are still available
cancel of the registration
I´m using Apex 4.1
Can I disable tracing just on deadlocks events on 11gR2?One of our applications provoke several deadlocks. I've warned the developers team several times, but it's taking time to solve it. However, these deadlocks generate trace files of several sizes (from 300M to 3G ..)The Deadlock Graph on them are very useful but the PROCESS STATE section are too long, and until the developers team fix the problem they are just filling up my user dump dest. Can I disable them or disable the PROCESS STATE section from them?
View 2 Replies View RelatedI am using 11.2.0.3.0 version of oracle. As told by the DBAs that two days back the system realised high wait_class i.e 'Application' wait, and its a lot high than regular value as per our system and we need to dig it down, to avoid any future issue. now using below query , i found that the high wait time due to wait class 'Application' is actually belongs to particular event 'SQL*Net break/reset to client', and the sample time was '9 AM' morning.
select time,
round(max(case when event = 'SQL*Net break/reset to client' then time_waited_delta/1e3/decode(total_waits_delta,0,1,nvl(total_waits_delta,1)) end) ,2) SQL_break_reset_client,
round(max(case when event = 'Wait for Table Lock' then time_waited_delta/1e3/decode(total_waits_delta,0,1,nvl(total_waits_delta,1)) end),2) Wait_for_Table_Lock ,
round(max(case when event = 'enq: KO - fast object checkpoint' then
[code]....
Now i want to track it down further to the 'session/sql query/application' level resulting into such high value of wait time. so i queried, dba_hist_ active_ session_history, for the same sample duration (8.30 to 9 am) having event 'SQL*Net break/reset to client', and got two sessions(123,154) and their serial# , but there i got one sql_id(3ahgrey10ogh i.e a 'SELECT' query) specific to one session(123) but for other(125) no sqlid, and also SUM (wait_time + time_waited) is showing '0'.
Then i just removed the sampletime filter from the below query and observed that the same 'same session(123)+session serial#' was activated since 4 days back and was experiencing same waitevent 'SQL*Net break/reset to client', (it was having normal wait event 'db file sequential read' for sometime then after it went for this event ).
SELECT user_id,
PROGRAM,
machine,
session_id,
SESSION_SERIAL#,
sample_time-7/24,
session_state,
[code]....
We have been using XLA to capture events on TimesTen for a while now without any issues. We were on TimesTen 7.0.5 and then moved to 11.2.2.3.0 and now 11.2.2.4.0. The XLA processes used Java 6 64 bit and works well with TimesTen versions 11.2.2.4.0 - 64 bit and 11.2.2.3.0 - 64 bit, without any issues.
However, we recently upgraded to Java 7 64 bit both during build time of our XLA processes as well during runtime. The problem we see now is that XLA process upon startup processes events for a while and then after that doesnt receive any events. The process doesn't throw any errors/exceptions. If we restart the XLA process, all the unprocessed events are received and then it behaves normally for a while after which it fails to receive any further events.
Is there any issue with Java 7 64 bit and the TimesTen XLA API? I read the TimesTen 11.2.2.4.0 manual and it says that Java 7 and the ttjdbc7.jar have been certified to work well. Was just wondering if there were any other issues.
In addition, to debug the problem, we ran XLA on a single node and on a two safe setup. The same observations are noted. On Java 6, the process runs just fine capturing all events without any issues, but with Java 7, the issues persist.
In addition, we are only performing updates/inserts on to TimesTen, no delete actions. The OS on which TimesTen's and XLA runs is Red Hat Enterprise Linux Server release 5.7 (Tikanga).
DB version: 11.2.0.3
I have enabled the below trace event before running query on my session.
ALTER SESSION SET events = '19027 trace name context forever, level 0x1000';ALTER SESSION SET tracefile_identifier = store_trace;
Then I ran my query, and upon the finishing of the query, I ran the below to disable trace.
ALTER SESSION SET events = '19027 trace name context off, level 0x1000';
Now I checked back on the trace folder in my Oracle DB directory structure, but cannot find any file created by using the above set tracefile_identifier. I had previously run the query with "sql_trace" ON with tracefile_identifier, and successfully got the tracefile generated by using the identifier.
I have a partitioned table with degree for parallelism defined as 10.
I am getting maximum wait events on PX Deq: Execute Reply.For 2 hours trace the wait event is almost 1.5 hour.
I have done some seraching and i found this.
Quote:
In principle:A parallel query against a partitioned table will use one slave per partition if the query is thought to span multiple partitions, and it can use all slaves on a single partition if the query is thought to target just one partition. Unfortunately, this is NOT strictly true.
It is possible for the optimizer to decide to use parallelism at degree M when accessing N partitions. Sometimes this can lead to very inefficient, brute-force, processing when a more efficient path is available. This can be a particular problem with multi-table joins that should be partition-wise joins. You may be better off leaving the tables defined as non-parallel and adding explicit parallel hints to the code for critical queries.
So i have following questions
1) What is the meaning of PX Deq: Execute Reply.
2) Is this not recommended to use DEGREE clause in Partitioning.
3) Defining DEGREE clause in partioning of table will automatically executes DML on table PARALLELY same a PARALLEL hint clause
I ran an AWR report. The database looks fine, but a data load that loaded 1 Million rows an hour is now doing 500K per hour.
Wait Class Waits %Time -outs Total Wait Time (s) Avg wait (ms) %DB time
DB CPU 224 80.70
Other 2,668 0 28 10 9.99
System I/O 4,753 0 9 2 3.23
Administrative 1 0 6 5543 2.00
Commit 357 0 4 11 1.46
[code]....
The network value for wait: 630,601. What does this mean? Anything I should look at? When it was 1million per hour, the value was 4,563,000.
Top 5 Timed Foreground Events
Event Waits Time(s) Avg wait (ms) % DB time Wait Class
DB CPU 224 80.70
unspecified wait event 2,666 28 10 9.99 Other
control file sequential read 4,753 9 2 3.23 System I/O
switch logfile command 1 6 5543 2.00 Administrative
log file sync 357 4 11 1.46 Commit
I have to create the matrix report which shows calender. Looks Like this.
View 14 Replies View Relatedcreate table test
(
id int ,
dat date
)
/
I want to implement a business rule such as we have for each id at most 1 dat null. So, I've created this unique index on test.
create unique index x_only_one_dat_cess_null on test(id, case when dat_cess is null then 'NULL' else to_char(dat_cess, 'dd/mm/yyyy') end);
insert into test values (1, sysdate);
insert into test values (1, sysdate - 1);
insert into test values (1, null);
insert into test values (1, null);
-- -----
insert into test values (2, sysdate);
insert into test values (2, sysdate - 1);
insert into test values (2, null);
The 4th insert will cause an error and this is what I wanted to implement. OK. Now the problem is that for non-null values of dat, we can't have data like this
iddat
------------
124/10/2013
123/10/2013
123/10/2013
1
because of the unique index (the 2nd and the 3rd row are equal). So just for learning purposes, how could we allow at most one null value of dat and allow duplicates for non-null values of dat.