How To Check Locks In Database

Apr 13, 2013

oracleDatabase version:11gR2

Os:solaris

how to check locks on database objects .it might be any lock? any select sql query to check database object levlel locks?what basis locks will occur?

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I used v$locked_object and v$lock query to get the output.. But still I'm an one year exp in ORACLE. How to analyze the output of lock queries. what are the parameters to be analyzed on AWR report.

How to do proper performance checkup in ORACLE database as well analyze it.

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say for example,

select a.eno,b.ename,c.salary,d.dob,e.address
from a,b,c,d,e
where...
...
..

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Scenario: Course enrollments are inserted, deleted and updated in course_main and course_users table. This is done in gui as well as in background snapshot scheduler in a cron process. Course_main table contains all course enrollments and course_users table has crsmain_pk1 as foreign key.

Its quite a big file and am not sure what should i paste here so am uploading the file in txt.

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i did the following steps for resolving.

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4 alter database open// this is also happend above error

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I have a job which runs the procedure below concurrently in 4 different sessions; It updates two tables.

PROCEDURE UPDATE_TAB_1_AND_TAB_2( traceIdTab IN pl_sql table,
individualIdTab IN pl_sql table,
fileSeqIdTab IN pl_sql table,

[Code].....

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My code executes a Select For Update before updating a table. In some cases the network is disconnected and it causes the lock to hang. Then, I must kill the session in order to realese this lock.

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I have a forms 11g application that of course has several message and alert windows that pop up when various errors or messages need to be displayed. This all works great on the developer machine, but when I try and run the form on another machine using any browser the message and alert windows appear to be hidden and the application locks up with the rolling bar across the bottom. I would guess it is waiting for a response, but I cannot get the window to appear.

Following is an example of an alert to be displayed:
declare
vAlertButton number;
begin
vAlertButton := show_alert('NO_EMAIL');
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RAC & Failsafe :: Inserting Large Data Locks The Destination Table In RAC

Oct 18, 2010

Scenario:

Our application is using a two instance, one for the live active data and the other for the reports data. We have a process which moves the data from the live instance to reports instance every night. In a single db environment the process is working without any issues. However when we move to the RAC environment the reports db's (insert) in large table get locked and we are unable to insert data to the reports db.

What we are performing is:

Insert into my_table_rpt select * from may_table_live@db_link_to_livedb;

Issues:

my_table_rpt get locked

We have found the workaround by disable locking in destination and subsequent to the insert enable locking

ALTER TABLE my_table_rpt DISABLE TABLE LOCK;

Insert the data to the reports database table

Then

ALTER TABLE my_table_rpt ENABLE TABLE LOCK

Question:

Why does the large destination table (my_table_rpt) get locked in the RAC environment?

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