how the DB handles record locking when an aggregate function is called? For instance:
...
select count(*)
into v_count
from x;
...Is there a lock maintained on table x for the duration of the transaction so no rows can be inserted or deleted?
I have developed a form, containing 5 tab pages and also referencing to 5 tables.tab page a of table a some fields are required and some or not.when i open form and start entering record, and then i change mine and dont enter and want to navigate to some other page, it simply allows me to leave it blank and move to some other tab page.
tab page b of table bsome fields are required and some or not.when i open this tab page and one i click in the first field and then do not enter anything in it and want to leave it , it does not allow me to leave blank.what could be the reason. why one tab page allow me to leave blank and navigate and why the other does not?first field of both tab pages are required.
I have one table emp with columns id , name and dept. i want query to get the list like this........
ID name did
1 ajay 10,30,40,60
2 sree 10,30,70
I have a query more or less like this:
SELECT field1,
COUNT(x) AS COUNT
FROM my_table
GROUP BY field1;
For field1 I want to get a count, but if field1 is like 'ABC%' then I want to combine all of those.
So if I have the following:
ABC1 | 5
ABC2 | 10
XYZ1 | 3
I want results like this:
ABC | 15
XYZ1 | 3
I've tried using some case statements like
SELECT CASE
WHEN field1 LIKE 'ABC%' THEN
'ABC'
ELSE
field1
END AS field1,
COUNT(x) AS COUNT
FROM my_table
GROUP BY CASE
WHEN field1 LIKE 'ABC%' THEN
'ABC'
ELSE
field1
END;
but this just gives me
ABC | 5
ABC | 10
XYZ1 | 3
How can I combine record 1 and 2 from the last record set example above?
Do we have analytic function equivalent of following?
select object_type,owner from dba_objects group by object_type,owner ;
I am trying to get a unique srno for a combination of a 2 fields - here object_type and owner
OWNEROBJECT_TYPESRNO
SYSVIEW1
SYSTABLE2
SYSPROCEDURE3
SYSTEMVIEW4
SYSTEMTABLE5
SYSTEMFUNCTION6
SYSTEMPROCEDURE7
SCOTTTABLE8
SCOTTVIEW9
.......................
also how can I get the SRNO?
I can' use sequence in the group by function and if I get equivalent analytic for above group by even then I can't write row_number as the order by gives detail record
I don't want to wrap this select inside other select
I am getting most of the time 'out of process memory' when i run the 'ord' procedure.here i am providing the tables and the procedure.
i have 2 table orders which holds distinct values, and departments table has ordvalue column holds long string of values for a particular record from orders table. for example if the values in orders table as follows:
ord_code ord_level ordid ordstatus ord_num user utimestamp
SR11 1 2 A 101 V SYSDATE
SR11 1 2 A 102 V SYSDATE
SR11 1 2 A 103 V SYSDATE
SR11 1 2 A 104 V SYSDATE
SR11 1 2 A 105 V SYSDATE
SR11 1 2 A 106 V SYSDATE
SR11 1 1 B 101 R SYSDATE
SR11 1 1 B 102 R SYSDATE
SR11 1 1 B 103 R SYSDATE
SR11 1 1 B 104 R SYSDATE
SR11 1 1 B 105 R SYSDATE
SR11 1 1 B 106 R SYSDATE
ETC...
AT TABLE departments data will be like this
ord_code ord_level ordid ordstatus ord_num user utimestamp
SR11 1 2 A 101,102,103,104,105,106 V sysdate
SR11 1 2 B 101,102,103,104,105,106 R sysdate
from the get_ord procedure the data aggreates using the xmlelement and gets as a long string value into departments table of ord_num column.
CREATE TABLE test.orders
(
ord_CODE VARCHAR2(4 BYTE) NOT NULL,
ord_LEVEL VARCHAR2(1 BYTE) NOT NULL,
ordID NUMBER(5) NOT NULL,
ordstatus VARCHAR2(1 BYTE) NOT NULL,
ord_num NUMBER(3) not null,
user VARCHAR2(8 BYTE),
UTIMESTAMP DATE
[code]...
is it possible to obtain a called procedure/function name within package?
For a measuring and tracing purpose, I would like to store an info at the beginning of each procedure/function in package with timestamp + additional details if needed.
For example:
CREATE OR REPLACE PACKAGE BODY "TEST_PACKAGE" IS
PROCEDURE proc_1 IS
BEGIN
[Code]....
I would like to replace "???????" with a function which would return a name of called procedure, so result of trace data after calling TEST_PACKAGE.proc_2 would be:
11.1.2013 09:00:01 START.*TEST_PACKAGE.proc_2*
11.1.2013 09:00:01 START.*TEST_PACKAGE.proc_1*
11.1.2013 09:00:01 END.*TEST_PACKAGE.proc_1*
11.1.2013 09:00:01 END.*TEST_PACKAGE.proc_2*
I tried to use "dbms_utility.format_call_stack" but it did not return the name of procedure/function.
In the below SQL, I am calling a function "listagg_nm(deptno)", and function is to get all the employee name for a particular department with comma separated
output is:
-------------------------------------------------
DEPTNO SAL LISTAGG_NM(DEPTNO)
10 5000 KING,CLARK,MILLER
10 1300 KING,CLARK,MILLER
10 2450 KING,CLARK,MILLER
20 2975 JONES,SCOTT,FORD,SMITH,ADAMS
[code]....
below are the code
select deptno,sal,listagg_nm(deptno) from emp order by deptno;
FUNCTION listagg_nm (p_deptno NUMBER)
RETURN CLOB
IS
v_str CLOB;
[code]....
My doubt/question is for every row in the SQL the function is being called. t means that for 1st row deptno=10, the function is called and return all concatenated name for department 10, then again for 2nd row deptno=10, it again do the same, similarly for all other department.
Can we avoid this, I mean, if function is already returned a concatenated string of ename for deptno=10, then in the next function call it will checks if it is for same department (i.e. deptno=10) then the function will not go into for loop and it will directly return the concatenated string of ename for deptno=10 which we already done for the first row and so on for other department number ( something like storing the value in variable. Is it possible to achive this and does this is good for performance as we are not going into loop inside the function to return the concatenated string of ename for the same deptno everytime ( I have to return more than 10000 char., so i used clob in function and similarly the numbers of row return by SQL is more than 1000)and also how to code this, I tried but unable to achive.
11.2.0.1 I am still resolving the locking issues in our database Often the delete is blocked by some transaction. The operations said that it is intermittent. Last night they were able to delete the 1M transactions without the locking.But the past days lock often occurred, and they have to bounced the database to release the locks.
I there a way I can compare what happened last night why the batch was able to delete smoothly , and compare it against the other night where the delete was blocked?By using ASH, AWR, ADDM? I also run now this procedure, to identify the blocking sql statement:
SQL> exec dbms_workload_repository.add_colored_sql(sql_id => 'fn3qv2dhsu3nb');
PL/SQL procedure successfully completed.Can I now run AWR,ASH,ADDM, to identify/capture the sql being run?
I am a developer and not a DBA and I need to find th correct query to find the exact rowid of the record locked on a table. This is for a RAC database and locked record can be from the web form in oracle application server. When I try to get the correct row id, I get the following error:
ORA-01410 - Invalid row id For the criteria, the output is Dbms_Rowid.rowid_create(1, -1, 36, 7845, 0), why I get a -1 for the ROW_WAIT_OBJ#?
Additional Information: The lock type is DML and the lock mode is: Row Exclusive, the table is locked and the program is web oracle forms executing.
I am executing the query in Oracle Database 11g Enterprise Edition Release 11.1.0.7.0
How to accomplish getting the correct rowid? Below is the selection criteria I have:
select vs.inst_id,
vs.audsid audsid,
locks.sid sid,
[Code]....
I need to display a slider with a handler where the users can slide the handle to have values changed. I good on that part.But I have specific requirement, that I need to show two more handles on the same slider at different points showing threshold and benchmarks and those two slider handles cannot be moved. I am even successful in displaying three handles on same slider, but the newly added sliders were also sliding, but I need the newly added slider handles not slide even if user is sliding them. Here is my code
<div id="temp1" style="width: 500px;"></div><script type="text/javascript">$( "#temp1").slider({ values: [ 10, 25, 80 ], min: 0, max: 100, step: 1, slide: function( event, ui ) {return true; },change: function( event, ui ) { return true;}}); </script>
Among Hibernate optimistic locking & Database Isolation levels, which one to use? Which gives the better consistency, concurrency and scalability. I read in couple of links that Isolation level will suffer if there is a huge load on the application with multiple users access the appliation at the same time, moreover in islation levels normally we need to look for READ_COMITTED and NON_REPEATABLE_READ to get a better performance? Whether these are true? Whether we can use both Hibernate optimistic locking(version & timestamp) & Database Isolation levels in the same application? What are the implications using these? Which one will be preferred over the other and when?
View 2 Replies View RelatedAt the moment, we were loading the file in our system serially. This is a very old and established system.We would like to incorporate parallel loading for our loaders to load data into the database.
Most of the issues would be due to multiple inserts happening due to the files being loaded in parallel. For some reasons, we cannot give regular commits untill the entire batch of items is processed in case the process needs to rollback. A file can contain different set of batch of items clubbed together for loading.
The issue here is untill the first file finishes loading and commits, the second file would just hang. In fact, mulitiple files might hang for the first file to finish. what can I do to overcome this?I tried to used "lock table t1 in SHARE ROW EXCLUSIVE mode nowait". When the leading process is doing inserts, the failing process will fail with a resource busy and acquire with NOWAIT specified. We would catch this exception and redirect that batch to an error file to be reloaded at a later date.
create or replace function kardex_ob (f_item_code varchar2,f_date date) return number is
f_ob_quantity kardex.cb_quantity%type;
cursor cur_kardex is
select cb_quantity
[code]...
If the above function is called it shows the first Record in the Table "kardex" for example:
if we run this query which is taken in the above function;
select cb_quantity
from kardex
where item_code = f_item_code and
document_date < f_date
[code]...
so here if i call the function(Kardex_ob) it shows the first Record "8500",well if i wish to show the next record 5000, thenhow to get it through the above Coded function?
I'm trying to execute a dynamic sql that calls a function. But that function has inserts and deletes inside and this way it can't be called through a select statement. And to be worst, it has an other problem, my function uses a record type as parameter.
My code (sample):
-----------------
DECLARE
type r_parameters is record
(cd_query cons_query_param.cd_query%type,
cd_usuario cons_query_user.cd_usuario%type,
nr_param cons_query_param.nr_param%type,
vl_param varchar2(2000),
[code].....
I have Two cursor record block..which is attached in form..
My TASK IS
In my first Block, When DBCR Column = 'D' Then in backend this column value should be save as a '1'
WHEN DBCR Column = 'C' Then Then in backend this column value should be save as a '2'
My Both Field is on Data Block...
In Property palette of this field can we write any decode condition..so it reflects directly on database.
I want to use a function in join clause. so i go for pipelined function(using for loop to get record & 1 more loop to fetch in table type variable). i achieved what i required. but problem is it takes much time to fetch data. is there any other approach which returns table records without pipelined function.
View 2 Replies View Related1 - i want to ask few things as i m new to apex, i am using apex 4.1, and created 3 select list and a button in selecting of parameter,
1 select list : select area
2 select list: select product
3- select list - size of the product
i want to generate Ids for the following. for that i created query for INSERTING RECORD FROM ONE TABLE TO ANOTHER , generation the ids when button pressed "Generate" after selecting parameters,
Now where i call that QUERY on button ? because when i create button its gives me option to submit, defined dynamic action, etc, where i call the function name id_generation when button pressed?
2- second thing i created tabular " select user_id, product_name, product_type from product".
By default check box list are create delete submit button are created, first when i insert record it saves that was fine, e.g i entered 50 records and afterward i want to update only one record, e.g there is a record product name = box, if i change it to box small and click submit then it saves all the page means all 50 records,
I want to submit only that record that i changed, for that i use the logic that only those records should be updated which are checked but the user. how will i do this ?
I am facing the row lock issue in production. I have been trying to resolve the issue but i coud'nt. I traced out by using different queries which sql query is locking which but everything looks good.
And i also checked for connections open and close everything is in good place but unable to resolve the issue. we are running a batch file which runs in every night some of the records are processing and if any one record is failed it is blocking another records.My oracle version is oracle 10.2.0
I want to Who is locking the table by an SQL statement
View 32 Replies View RelatedSay we have an employee(id_emp) table with a primary key on id_emp. We have also some history tables emp_stuff with columns say (id_emp, dat_event, some_stuff) with primary key id_emp, dat_event.
This means that we have a unique index on (id_emp,dat_event). We also have a foreign key id_emp that references employee(id_emp). When we update id_emp on employee, we still have a lock on emp_stuff. According to this (end of the page) :
Quote:So, in short, with releases prior to Oracle Database 11g Release 1, you will want an index on the foreign key of the child table if you do any of the following:
Update the parent table primary key
Delete from the parent table
Merge into the parent table
So is id_emp in emp_stuff considered as indexed (through the unique index of the primary key) or do we have to add an explicit index
like this CREATE INDEX emp_stuff ON emp_stuff(id_emp) to avoide child table locks?
Using Oracle 11gr2. If I call the following update statement from session A, session A will lock the row until a commit/rollback statement is issued from session A. If session B calls the same update statement and same row, session B will have to wait until the lock is released in session A. However, the application developers are speaking in terms of threads. Could it be possible that the update statement is called within the same session by multiple requests? If yes, could the case statement be evaluated without the row being locked which could lead to false results? Trying to keep this post brief. tableA has columnA (primary key, number) and columnB (number)
{update tableAset columnB = case when columnB = 3 then 4 when columnB = 4 then 5 else columnB endwhere columnA = 6;}
Could 2 requests (almost at the exact same time) in the same session evaluate columnB as 3. The desired result would be the first request sets the column to 4 and the second request sets the column to 5.
We have a table with several columns (id, title, description, area).The data in the table looks like this
1 sometitle1 description1 USA
2 sometitle2 description2 Germany
3 sometitle3 description3 Japan
4 sometitle4 description4 Honduras
We have Oracle users with their usernames and password. We would like to lock every single user to a certain area.Example:
user 1 may see only records, where AREA=USA
user 2 may see only records, where AREA=Honduras
How can I do this in Oracle. I am using Oracle Enterprise 9.2
I am having a data guard setup done in oracle 10g(10.2.0.4.0) WINDOWS Platform. some of the archive process are locked in primary db side.
PROCESS STATUS LOG_SEQUENCE STAT
-------- ---------- ------------ ----
0 ACTIVE 0 IDLE
1 ACTIVE 804462 IDLE
2 ACTIVE 0 IDLE
3 ACTIVE 0 IDLE
4 ACTIVE 0 IDLE
5 ACTIVE 800011 BUSY
6 ACTIVE 0 IDLE
7 ACTIVE 800009 BUSY
8 ACTIVE 0 IDLE
9 ACTIVE 802335 BUSY
10 ACTIVE 0 IDLE
Shall we kill the locking archive processes? killing archive processes will cause any problem?
how to avoid oracle deadlock with two sessions. Here is my example, We use Select query with For Update in order to get the unique number from a table. When one user has accessed this query, while the other user tries, System gives a Performace slow and when checked it is due to locking of this select query with For update.
We don't want to use For update WAIT or FOR UPDATE NOWAIT since these will result in missing of number.
I've a table TXN1 transaction and has FKs to 3 different tables Account, customer, country and currency. ALL FKs are indexed (bitmap). I am updating TXN1 of amount column about 10,000 rows. (SID 1) As expected, it has taken lock type 3 SX on TXN1. But it has taken on lock type 4 (share) on Account, customer and country. Committing every 10k rows.
At the same time sid 2 is inserting into another TXN2 table which has FK to the same dimensions account, customer and currency. Only FK on ac_id is bitmap indexed. The inserts have taken SX lock(type 3) on tXN2 table (expected). But it is trying to take SX type 3 lock on account, customer, currency tables. typ3 lock taken on CCY but waiting on CST. But It is blocked by sid 1. It has resulted into Enque-TM contention and resulted into anywhere 60-300 secs wait time..
I understand update/delete in parent table results into locking of SX of child tables and need the FKs to be indexed to avoid etc.
1. Why is SID1 taking shared lock on the parent tables Account,customer,country and currency tables? The update statement is not updating any of those FK columns nor referring them in where clause(if it matters!). Is it to ensure that the parent rows are not deleted?
2. Why is SID2 taking SX lock on the dimension tables? Why is it not taking RS lock type 2 on parent rows? Why is SID1 taking shared lock type 4, but not 2?
I need to aggregate the data based the two dates criteria.
I have two tables
1. Table1
Number Date1 Date2
1 10-Jun-2010 30-Jun-2010
2 10-Feb-2010 30-Feb-2010
----------------------------------
2. Table2
Number Date Revenue
1 11-Jun-2010 100
1 09-Jun-2010 100
1 12-Jun-2010 100
2 11-Feb-2010 100
2 12-Feb-2010 100
2 13-Feb-2010 100
......................
......................
So on
Output:
Number Revenue Date2
1 200 30-Jun-2010
2 300 30-Feb-2010
I have two table and I want to merge them
TERMS_TABLE
ID | TERMS
309 | 'hardware'
309 | 'software'
309 | 'computer'
TFIDF_TABLE
ID | TERMS
309 |'computer,phone,mp3....'
Now I want to add TERMS column of TERMS_TABLE to terms column of TFIDF_TABLE but If TFIDF_TABLE already contains TERMS of TERMS_TABLE then I should not insert this term to the NEW_TFIDF_TABLE , like that
result should be:
NEW_TFIDF_TABLE
ID | TERMS
309 |'computer,phone,mp3....,hardware,software'
How can I do that ?
I have a set of rows based on a complex view from multiple table.
I will be updating some of its columns from front-end . Is there any possible ways to lock those rows of data while updating and no other users can update it;
We had an issue last week were we had a session with a very basic SQL query lock up the database, spiking the CPU at 100%. When you would kill the session, the lock would just jump to another session and so on. We finally had to restart the database since our clients were being kicked out. After the restart of the database, the LGWR ended up locking and held the CPU between 85-95%. The archive logs were switching every 5 minutes, when normally it would be every 45min. We spoke with Oracle Support, but they just ended up brushing the issue off and saying it was a hardware issue and were not able to provide any kind of backing to that.
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