Library Cache Locks By Dynamic DDL
Jun 30, 2011
At a customers site I see lot of long lasting library cache locks during a complex ETL run. Several Sessions run in parallel and create Database tables with dynamic sql ( CREATE TABLE AS SELECT ....) .
Sometimes these procedures wait for each other with wait event 'Library Cache' . I presume that this is a side effect of the dynamic DDL in the stored procedures. Is that possible even when the Procs create different Tables but reference the same tables in their SELECT clauses ?
I presume that this is plausible but I need some arguments to convince my colleagues.
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Jul 29, 2012
We are getting Negative values of Library cache hit ratio in AWR Report of 11g(11.2.0.3) with Solaris[tm] OE (64-bit). Why it shows negative value.
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 99.87 Redo NoWait %: 99.99
Buffer Hit %: 92.17 In-memory Sort %: 100.00
Library Hit %: -3,321.23 Soft Parse %: 81.95
Execute to Parse %: 92.88 Latch Hit %: 95.11
Parse CPU to Parse Elapsd %: 87.25 % Non-Parse CPU: 81.39
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Oct 23, 2013
When I try to start lampp, I am getting the below error.
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/extensions/no-debug-non-zts-20090626/oci8.so' - libclntsh.so.10.1: cannot open shared object file: No such file or directory in Unknown on line 0
But I have libclntsh.so.11.1 in my system. Why it is searching for libclntsh.so.10.1?
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Mar 19, 2013
Despite it being one of the major selling points of Exadata (especially from X3 onwards), I'm struggling to find much information on our usage of the Exadata Smart FlashCache (I'm running RDBMS 11.2.0.2 BP7 on a V2 quarter-rack).
I can verify usage of the FlashCache by checking whether the object has been 'pinned' to the FlashCache via DBA_SEGMENTS and I can check for FlashCache usage by querying gv$sysstat (and even v$mystat), but are there other views that I could use? It seems a bit strange for Oracle not to provide the DBA all that much insight into their usage of this feature...
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Jun 20, 2013
What is the difference between cache fusion and Cache Coherency. Both are same or different functionality.
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Jul 10, 2012
I have some question.
TTversion : TimesTen Release 11.2.2.3.0 (64 bit Linux/x86_64) (tt112230:53376) 2012-05-24T09:20:08Z
We are testing a AWT cache group ( with CacheAwtParallelism=4 ).
Application(1 process) to the DML generates to TimesTen(DSN=TEST).
At this point, Are delivered to the 4 parallel DML?
[TEST]
Driver=/home/TimesTen/tt112230/lib/libtten.so
DataStore=/home/TimesTen/DataStore/TEST/test
PermSize=1024
TempSize=512
PLSQL=1
[code].......
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May 13, 2011
I have the below questions on the locking mechanism in a partition table. Example I execute the below query,
delete from table_name subpartition (subpartition_name);
In that case,
1. If we perform above query, then which level of lock is happened to the table/partition & sub-partitions?
2. If we perform above query on same sub-partition of the same table with different where clause, what will happen?
3. If we perform above query for same table but different sub partition at same time, what will happen?
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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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Feb 25, 2012
I have a sql script where triggers, procedures and functions are written. The triggers are causing db outages and causing problems in the application as well.
I am trying my best but with my low experience and expertise, am not able to make good progress.
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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Oct 8, 2012
We have encountered dead locks in EBS R12 Database 10.2.0.3. Even after bouncing the appstier and dbtier completely does not release the locks. How to clear the locks?
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Jan 6, 2011
Under what scenarios do we lock a table in the exclusive mode.
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Aug 23, 2010
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].....
Each session is passed a sequence generated file ID; so the records processed in each session are completely different.
However, everytime this job runs, without failure, ONLY TWO sessions process concurrently, while the other two sessions are blocked. Once the first two have finished, then the remaining two sessions start work.
I have being monitoring the sessions on each run daily, and realized that the first two sessions processing are each holding a transaction exclusive lock on objects; hence blocking the other two sessions.
When I tried to find the objects that the two running sessions have a lock on, I cant seem to find anything by searching DBA_OBJECTS.object_id. However, when I look for the objects that are being waited on, its either a partitioned table or a partitioned index on either table_1 or table_2.
At first, I thought it was an ITL lock and after much analysis, I did not find anything which definitely pointed to an ITL lock. However, just to make sure, I increased the INITTRANS value from 2 to 5, but the problem did not go away.
At this point, I have applied all I know to understand the origin of the TX lock and how I can work around this situation, and decided to ask higher powers in Oracle for advise.
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Sep 6, 2010
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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Jun 8, 2011
On DB123, I have 2 KILLED sessions which are not disappearing and are holding locks on some tables in ONE schema.
The sessions belonged to ETL process and I have killed them last Friday after they have been hanging for 3 days. Unfortunately, I've also killed the corresponding Unix session - and now I've read on the Internet that in those cases the KILLED sessions might be hanging forever (=until the DB is shutdown).
how to remove these locks.
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May 24, 2012
After ran db health check, my database report gives the following details
dml_locks OK. dml_locks = 3396, transactions = 849.
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Nov 8, 2011
how to avoid blocking locks.
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Jun 29, 2012
writing a script where there is a blocking lock for more than 30 minutes ?
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Aug 21, 2012
How to view the number of locks defined for a database? I am using Oracle 10g.
How to calculate the number of locks for a given sql select statement?
say for example,
select a.eno,b.ename,c.salary,d.dob,e.address
from a,b,c,d,e
where...
...
..
Assume all of them are row level locking.
I want to calculate the number of locks . How many locks will be held while running the above query?
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Aug 3, 2011
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.
I want to do it automatically. I would like to create a job that kills session that has a lock due to Select For Update that is not alive.
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May 6, 2011
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');
end;
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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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Oct 18, 2013
How to use the DLL? My DLL is loaded on the client host in the C: Documents and Settings USER webutil. When you try turning to the library, I get an error:
WUL-928 [CApiFunctions.set_invokeoncespec ()] EXAMPLE.DLL library is not available or does not contain a function MYFUNCTION
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Mar 19, 2007
FRM-10102: Cannot attach PL/SQL library XXX. This library attachment will be lost if the module is saved.I am getting above error message while opening Oracle 6i Form in 10g.
I get the following Alert message when I try to attach the library to my form - Attached library name S:.........xxx.pll contains non-portable directory specification. Remove path? Yes/No?
If I select 'No', the Form compiles and runs without any error.But if I select 'Yes', I get the following error message: FRM-40039: Cannot attach library xxx while opening form.
All files (fmb, fmx, pll, plx) are on the same path. I detached and then re-attached the library but this didn't work for me?
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Jul 6, 2010
very new to Oracle. how to generate the library
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Jan 26, 2010
I working in windows environment and using form 6i. Everyone have used the same form and they are getting properly. But when i run the same form i am getting the following error.
PDE-DFF003: Can't Open Library : D2KWUT32.DLL
I am getting the above error when i execute the following line on when - button - pressed
w_user := Win_Api_Environment.Get_Windows_username(False)
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Nov 1, 2012
I am using Apex 4.1.0 with Oracle 11gR2 and Oracle App Server (mod_plsql). I'm trying to incorporate the d3.js library (a visualization framework) in my Apex charts but am not having much success.
I found this article in which David Mann uses the library within an Apex 4.x application:
[URL].....
I replicated his exact steps in my own application but without success. I do not see how he was able to get his application to work. Indeed, the tutorial does not even use a dynamic action despite what the article title says.
Has any one used the d3.js library with their Apex application. If so, would you be willing to share how you went about it?
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Dec 1, 2008
I'm currently new to Oracle 10g SQL and I need to query a large library file.I need to find the different first keywords associated with references written by authors who have more than 10 references in the readings table.
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Jan 29, 2013
I have one procedure "PROC_A" in LibraryA, Is it possible to call this procedure PROC_A from LibraryB.
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Mar 18, 2011
in spotlight toad tool alarm appears about sql library miss rate 61,2%
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Jan 25, 2010
I am using forms 6i with 10g data base. i have compiled a form in developer 6i after that when i open *.fmb file it is showing PDE-PLI018 Could Not find Library "form name". i have not attached any library in form.
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