I am using JDBC to run a few queries from my Java program (multi-threaded one).I am facing an issue where a select statement is blocking a delete statement. From the java code point of view, there are 2 different threads accessing the same tables (whith different DB connection objects).
When the block occurs (which i was able to find out from the java thread dump that there is a lock on oracle), the below is the output:
SQL> SELECT TO_CHAR(sysdate, 'DD-MON-YYYY HH24:MI:SS') 2 || ' User '||s1.username || '@' || s1.machine 3 || ' ( SID= ' || s1.sid || ' ) with the statement: ' || sqlt2.sql_text ||' is blocking the SQL statement on '|| s2.username || '@' 4 5 || s2.machine || ' ( SID=' || s2.sid || ' ) blocked SQL -> ' 6 ||sqlt1.sql_text AS blocking_status FROM v$lock l1, v$session s1, v$lock l2 , 7 v$session s2,v$sql sqlt1, v$sql sqlt2 8 WHERE s1.sid =l1.sid 9 AND s2.sid =l2.sid AND sqlt1.sql_id= s2.sql_id AND sqlt2.sql_id= s1.prev_sql_id AND l1.BLOCK =1 10 AND l2.request > 0 AND l1.id1 = l2.id1 AND l2.id2 = l2.id2; [code]...
From the above it can be seen that a select statement is blocking a delete. Unless the select is select for Update, it should not block other statements is not it ?
I am trying to run following sql query,but it is throwing following error.
SQL> delete from b$gc_count_temp a INNER JOIN COMPLEMENTS ON b$gc_count_temp.CON NECTION_ID_TEMP=COMPLEMENTS.feature_conn_id 2 WHERE a.current_designation is null and a.current_low is null and a.current _high is null;
delete from b$gc_count_temp a INNER JOIN COMPLEMENTS ON b$gc_count_temp.CONNECTI ON_ID_TEMP=COMPLEMENTS.feature_conn_id * ERROR at line 1: ORA-00933: SQL command not properly ended
I am getting ORA-00933 after running below mentioned delete statement;
DELETE FROM REPOSITORY.MEDIASEGMENT MS INNER JOIN REPOSITORY.ROUTINGEVENT RE ON TRIM(MS.Segment_Key) = TRIM(RE.uuid) INNER JOIN REPOSITORY.TEMPCONTACT TC ON TRIM(RE.Contact_Key) = TRIM(TC.vduid) WHERE TC.CREATETIME BETWEEN (TO_DATE('04/24/2008 00:00:00','MM/DD/YYYY, HH24:MI:SS')) AND (TO_DATE('04/30/2008 23:59:00','MM/DD/YYYY, HH24:MI:SS'))
I have a session on a system here that has been stuck on a DELETE statement for a very long time and the session is pegging the CPU. Using TOAD here is the "current statement":
DELETE FROM WORKFLOW WHERE ID = :B1
ID is the primary key of the table.Here are some relevant stats, also from TOAD's session browser:
Elapsed time = 35507986900 CPU time = 35531815481 Buffer gets = 972040769 Disk reads = 951289273 Executions = 71462
I'm not sure I understand "executions" because from the information I have from the people who initiated this, this particular delete should only be occurring 30 times... maybe that stat means something other than what I think it does.I also ran a trace for 30 seconds using:
TKPROF: Release 11.2.0.1.0 - Development on Wed Feb 27 04:04:50 2013 Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved. [root@localhost trace]#
The resulting file is attached. Now the offending query in the tkprof, based on my interpretation, is the select from the CMTE00 table, which contains 2344482 rows and no index on the workflow_id column. The relationship between CMTE00 and WORKFLOW tables are 1 to 1. There is a foreign key on CMTE00 pointing to the primary key of WORKFLOW which is what I assume initiated this query - I assume this is oracle checking the referential integrity since our code is not executing that statement. Also of interest, prior to this delete statement, the corresponding entry in CMTE00 was deleted in the same transaction. Google searching "db scattered file read" lead me to one of your (Don - if you read this) articles and appears to indicate that individual blocks are being fetched off the disk and this is what is taking up all the time.
DELETE FROM sre_t WHERE TO_CHAR(end_dt,'yyyy')<'2000' or TO_CHAR(start_dt)<'yyyy')<'2000';
It's executing for 15 to 20 minutes after that i got the error "session timed out"..The table is having four crore records.The delete statement is deleting 12,00000 records.
In my code I am using delete statement which is taking too much time to execute.
Statement is as follow:
DELETE FROM TRADE_ORDER_EMP_ALLOCATION T WHERE (ARTEMIS_SOURCE_SYSTEM_ID,NM_ARTEMIS_SOURCE_SYSTEM,CD_BOOK_KEY,ACTIVITY_DT) IN (SELECT ARTEMIS_SOURCE_SYSTEM_ID,NM_ARTEMIS_SOURCE_SYSTEM,CD_BOOK_KEY,ACTIVITY_DT FROM LOAD_TRADE_ORDER WHERE IND_IS_BAD_RECORD='N');
Every column in "IN" clause and select clause is containing index on it
Every time no of rows which to be deleted is vary (May be in hundred ,thousand or hundred thousand )so that I am Unable to use "BITMAP" index on the table "LOAD_TRADE_ORDER" column "IND_IS_BAD_RECORD" though it is containing distinct record in it.
Even table "TRADE_ORDER_EMP_ALLOCATION" is containing "RANGE" PARTITION over it on the column "ARTEMIS_SOURCE_SYSTEM_ID". With this I am enclosing table scripts with Indexes and Partitions over it.
way for fast execution in of above delete statement?
our system has always been running on mysql database and recently we have switched to oracle. As the current system is coded using mysql query syntax, when i run this program using oracle database, i got a error. The language that I'm using is JSP.
this is the error message:
The following query could not run on oracle. To convert these mysql queries to oracle compatible queries.
SELECT productID,productName FROM products order by productName;
select newsID,newsDate,newsHeadLine1 from news order by newsDate Desc limit 3
SELECT fuji_products.productID, productName_Display FROM products,products_availability where products_availability.productID=products.productID and (product_status='enabled' or product_status='all') AND category='12'
SELECT catID, catSub1 from category where catSub = '"+ prodCat +"' AND catSub1 is not null group by catSub1 order by catSub1
I have to write a procedure that accepts schema name, table name and column value as parameters....I knew that i need to use metadata to do that deleting manually.
HOW to use variable P_TMPLID in following statement
TYPE typ_unrecon IS TABLE OF REC_' || P_TMPLID ||'_UNRECON%ROWTYPE index by binary_integer;
because its throwing error while compiling
and also in statement FORALL i IN unrecondata.FIRST .. unrecondata.LAST SAVE EXCEPTIONS --STRSQL := ''; --STRSQL := ' INSERT INTO REC_' || P_TMPLID ||'_UNRECON VALUES ' || unrecondata(i); -- EXECUTE IMMEDIATE STRSQL; INSERT INTO REC_' || P_TMPLID ||'_UNRECON VALUES unrecondata(i);---throwing error on this statement commit; --dbms_output.put_line(unrecondata(2).TRANSID); EXCEPTION
In the following merge statement in the USINg clause...I am using a select stament of one schema WEDB.But that same select statement should take data from 30 schemeas and then check the condition below condition
ON(source.DNO = target.DNO AND source.BNO=target.BNO);
I thought that using UNIONALL for select statement of the schemas as below.
- returning from the procedure 2 ref cursors containing result set of 2 queries - returning from the procedure 1 ref cursor containing result set of that 2 queries as one (with UNION ALL)?
which contains multiple contact details for users of different types; type 1 is home, type 2 work etc. The following query returns the user's number and the latest home number for that user.
select user, details as latest_home_number from nc_test t where type = 1 and updated = (select max(updated) from nc_test t2 where t2.user = t.user and t2.type = t.type) order by t.user
However I am not very experienced with sql and I am not sure how to create a view which would contain the fields:
I have to change some queries from SQL to Oracle but I couldn't convert these queries because they use some system tables in SQL that I don't know the equivalent Oracle tables. Following are SQL Queries
1. SELECT name, xtype FROM sysobjects WHERE xtype IN('U', 'V') AND name <> 'dtProperties' AND objectproperty(id, 'IsMSShipped') = 0 ORDER BY name
2. SELECT tS.name FROM sysobjects AS tS WHERE (tS.name IN (SELECT name FROM sysobjects WHERE xtype = 'U') AND xtype ='U') OR (tS.name IN (SELECT name FROM sysobjects WHERE xtype = 'V') AND xtype ='V')
3. SELECT o.name as TableName, c.name as FieldName, c.colid as Field_Ordinal, t.name as FieldType, c.length as FieldLength, c.prec as FieldPrecision, c.scale as FieldScale, c.isnullable, c.iscomputed, CASE WHEN c.status & 0x80 > 0 THEN 1 ELSE 0 END AS isidentity, columnproperty(o.id, c.name, 'IsRowGuidCol') as isrowguidcol FROM (sysobjects o JOIN syscolumns c ON o.id = c.id) JOIN systypes t On c.xtype = t.xtype WHERE o.xtype IN ('U', 'V') AND (t.xtype = t.xusertype)
On a tab page should be displayed the result of four indifferent queries, each based on a stored procedure.At the moment, the queries are processed serially, by the statements:
We have the following case: an application modifies a table in an Oracle db (10.2.0.3.0).
Unfortunately the update SQL statements from the application always use the condition "where Column1 = 'some given value'" which is wrong (never mind why).
It should be instead "where Column1 = 'some value' and Column2 = 'val for Column2'. The 'val for Column2 will be taken from the very SQL query being issued (we can make the application do an update for Column2 even if the value in it never changes).
So all the update queries from the application look at the moment like that:
"update my_table set Column2 = 'val for Column2', Column3 = 'some other values', Column4 = 'some other value' where Column1 = 'some given value'".
We would like to capture them and somehow on the fly modify them to look like that:
"update my_table set Column2 = 'val for Column2', Column3 = 'some other values', Column4 = 'some other value' where Column1 = 'some given value' and Column2 = 'val for Column2'".
Can a trigger "before update" do it? For some reason we cannot at the moment ask the vendor to change the hard code of the application so we are looking for a temporary workaround.
I have two queries that I need to run and compare the outputs against each other. Each query runs on a different host. I can run each query on a different pane (Window - I am using Toad for running query). What I am trying to do is:
- Run both queries on a single pane - Compare the output where if a "study" matches on both query output, then display the result.
To being with, is it possible to run the queries on a single pane by defining SID string as a part of query syntax......?
SELECT study, TO_CHAR (completed_date, 'mm/dd/yyyy') completed_date, status FROM ...
I have some troubles when I try to retrieve last executed queries in a database.
For example;
I run the script below:
select distinct t.first_load_time, t.sql_text, t.last_load_time, s.username from v_$sql t, v$session s where s.username='SYS'
And as a result, I retrieve the queries executed by SYS user. But the problem is that, if SYS user executed the same query more than once, only the very first record is shown.
It is like this,
SYS user executes "select * from table_abc" at 10:54:35, and after that SYS executes the same query at 13:45:55. and after running the query above, I can only see the record which was executed at 10:54:35. I need to see the both results.
How I can get the union result of 2 queries and put them in xml result, but I want each query to be in seperate xml element. I don t want to put 1 single xmlelement and do a From then construct a virtual table uniting the 2 subqueries
I mean I don t want something like the following:
(Select XMLAGG( XMLELEMENT("credit",
[Code]...
Except the 2nd alternative is not working I get error message: "SQL command not properly ended"
I am trying to validate a monthly report so was trying to write queries to get different criteria into one table. So my first query returns all the product,second query returns all the enrolled customers, 3rd query returns all the cancelled customers and 4th query returns all the newly enrolled for a month. Is there a way I can pass the first query results into 1st column, 2 query results into 2nd column, 3 query results into 3rd column and so on.
I tired writing the SQL several different ways and have spent a day on it and still cannot figure it out. I am using SQL Developer.
I am trying to trace the SQL statements executed against a particular database user. I don't have AUDITING enabled and I am using Oracle 11g.I have the following query :
SELECT S.MODULE, SQL_TEXT , S.EXECUTIONS FROM [code].....
But if multiple users running the 'APP.EXE' are connected to the same db user, I am not able to understand which OS user executed which query. So I tried to join with V$SESSION view to get the user details.
SELECT S.MODULE,SQL_TEXT ,SN.OSUSER, SN.MACHINE, S.EXECUTIONS FROM SYS.V_$SQL S, SYS.ALL_USERS U, V$SESSION SN WHERE S.PARSING_USER_ID=U.USER_ID AND UPPER(U.USERNAME) IN ('USERNAME') AND (UPPER(S.MODULE)='APP.EXE') AND S.SQL_ID=SN.SQL_ID ORDER BY S.LAST_LOAD_TIME
But this doesn't seems to be working(In my case it didn't return any rows) I have also tried the following
select S.SQL_TEXT,S.MODULE,S.EXECUTIONS,SN.OSUSER,SN.MACHINE,SN.SID, U.username,U.user_id from SYS.V_$SQL S, v$open_cursor oc,SYS.ALL_USERS U,V$SESSION SN where S.PARSING_USER_ID=U.USER_ID AND UPPER(U.USERNAME) IN ('USERNAME') AND (UPPER(S.MODULE)='APP.EXE') and oc.SQL_ID=s.SQL_ID AND SN.SID=OC.SID AND SN.SADDR=OC.SADDR;
but I am not sure whether this is giving the right results. So, I have the following questions
1) How do I get the queries executed by each session?
2) The EXECUTIONS column of V_$SQL seems to the executions from all the sessions. How do I know the number of times a particular query is executed by a session?
3) How long a record about a query will be stored in V_$SQL? When do Oracle delete it from the view?
