SQL & PL/SQL :: Select Statement Is Blocking A Delete Statement
Jan 11, 2012
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 ?
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Sep 13, 2013
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.
SELECT
DNO,
BNO,
c2,
c3,
c4,
c5,
c6,
c7
[code]....
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Jan 12, 2011
If i inserted the values in table it gets inserting very few rows only.I dont know y it is?
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Mar 14, 2011
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
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Sep 6, 2012
I've small doubt regarding the subqueries in delete statements. observe the below statements with their results.
SQL> alter table emp3 rename column deptno to deptid;
Table altered.
SQL> select deptid from dept;
select deptid from dept
*
ERROR at line 1:
ORA-00904: "DEPTID": invalid identifier
[code]...
but when you use same subquery in update or select stmt it throws 'invalid identifier' or similar error.Why same does not happen with delete stmt ?
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Jan 23, 2009
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'))
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Mar 14, 2013
I was reading about merge statement and tried some variations,
create table MERGE_TEST(
C1 number,
C2 varchar2(10 char),
c3 number);
insert into MERGE_TEST values(1, 'Name 3', 300);
insert into MERGE_TEST values(1, 'Name 2', 200);
insert into MERGE_TEST values(1, 'Name 1', 100);
commit;
[code]...
why is result different in this querys?
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Jul 4, 2010
i want to select dynamic column names in my select statement in my function.
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Feb 26, 2013
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:
CODESQL> begin dbms_monitor.session_trace_enable(session_id=>97, serial_num=>15, wai
ts=>true, binds=>true); end;
2
3 /
PL/SQL procedure successfully completed.
SQL> begin dbms_monitor.session_trace_disable(session_id=>97, serial_num=>15); e
nd;
2 /
PL/SQL procedure successfully completed.
I ran tkprof over the resulting trc file:
CODE[root@localhost trace]# /oradb/devmain/product/11.2.0/dbhome_1/bin/tkprof ltw35qa1_ora_19558.trc
output = delete_scattered2.txt
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.
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Sep 7, 2010
I executed the following delete statement.
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.
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Apr 15, 2011
Test1 table have around 385772300 rows. below delete and select statment talking lot of time.
Select stament taking more than 1 hrs.
SELECT TO_NUMBER(MAX(f.T3))
--INTO v_FISCAL_MONTH_ID
FROM Test1 f;
delete statment taking more than 2 hours
DELETE FROM TEST1 WHERE TRUNC(T10) < TRUNC(ADD_MONTHS(SYSDATE,-36));
CREATE TABLE Test1
(
[Code].....
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Jun 18, 2012
The following query take lot of time when exectued, even after I drop the indexes, is there a better way to write the following query?
DELETE from pwr_part
where ft_src_ref_id in (select ft_src_ref_id
from pwr_purge_ft);
--Table:pwr_part
--UIP10371 foreign key (FT_SRC_REF_ID, FT_DTL_SEQ)
[Code]...
Explain Plan:
Description Object owner Object name Cost Cardinality Bytes
SELECT STATEMENT, GOAL = ALL_ROWS 224993 5492829 395483688
HASH JOIN RIGHT SEMI 224993 5492829 395483688
INDEX FAST FULL SCAN PWR_OWNER PWR_PURGE_FT_PK 43102 23803770 142822620
PARTITION HASH ALL 60942 27156200 1792309200
TABLE ACCESS FULL PWR_OWNER PWR_PART 60942 27156200 1792309200
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Aug 28, 2007
The following script doesnt work.
DELETE
FROM PSPROJECTITEM I
WHERE I.PROJECTNAME = 'TEMP1'
and (I.OBJECTTYPE between 79 and 84
or (I.OBJECTTYPE = 58
and I.OBJECTID1 = 104
[code]...
It gives the following error:
Error at Command Line:12 Column:6
Error report:
SQL Error: ORA-00933: SQL command not properly ended
00933. 00000 - "SQL command not properly ended"
*Cause:
*Action:
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Mar 9, 2010
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');
Tables Used:
oTRADE_ORDER_EMP_ALLOCATION Row count (329525880)
oLOAD_TRADE_ORDER Row count (29281)
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?
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Dec 29, 2010
Why Blind select is better than Conditional select Statement?
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Aug 10, 2011
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
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Mar 22, 2013
simply select and works great:
select 'CARAT Issue Open' issue_comment, i.issue_id, i.issue_status, i.issue_title, i.ISSUE_summary ,i.issue_description, i.severity,gcrs.Area_name, gcrs.sector_name,
substr(gcrs.stream_name,1,case when instr(gcrs.stream_name,' (')=0 then 100 else instr(gcrs.stream_name,' (')-1 end) ISSUE_DIVISION,
case when gcrs.STREAM_NAME like 'NON-GT%' THEN 'NON-GT' ELSE gcrs.STREAM_NAME END as ISSUE_DIVISION_2
from table(f_carat_issues_as_of('31/MAR/2013')) i inner join v_gcrs_with_stream gcrs on i.segment_id = gcrs.segment_id
where UPPER(ISSUE_STATUS) like '%OPEN%'
Now I want to callte two columns:ISSUE_DIVISION and ISSUE_DIVISION_2
if they are equal in new columns should be value 1 if are not equal should be 0,how can I do it ?
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May 5, 2010
I have a question about select statements, as I am new to them and don't know how to work all the commands yet.
I'm making a select statement that is about half right... it is shown below:
select t.warehouse_id,
t.quantity_on_hand,
c.product_name
from pahtest3.inventories t
join pahtest3.product_information c using (product_id)
WHERE warehouse_id in (7);
I need to take this select statement and make it so it shows all the products that don't have any quantities in the warehouse in addition to the ones that are already being shown in that select statement.
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Jun 15, 2007
decode (a.cancel_time,'',sum ((to_date('23:59','hh24:mi') - a.alarm_time)*24*60), sum((a.cancel_time - a.alarm_time)*24*60)) Duration,
After executing this statement. I get negative values if cancel time is null
I want to subtract alarm_time by 24 hours, if cancel time is null. If not null then cancel-time - alarm_time
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Aug 23, 2008
how to set the timing on for all SELECT statements in a procudeure...and i want that should come as a output for very SELECT statement slong with my original output.
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Sep 1, 2011
I have a need to use the Alias name of a column within the same select statement( because I can't have another select statement using the first select as table - BO tool limitation).
Ex:
Select dept_id, agency, sum(quantity) as "sum_qty"
where sum_qty > 500;
Currently oracle won't allow using alias name Sum_qty in the same select statement. Is there a way to use alias within the same select statement?
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Jul 5, 2011
I'm trying to write a simple query so I can do some testing on my application. I am trying to do something like this:
SELECT
Location,
LEVEL,
FROM
S_ORG_EXT
where
Location = 'North America' and LEVEL ='Software'
OR location = 'North America'
and Active = 'N'
in the where statement, I have put in the 'Active' that isn't a column. I want to be able to be able to change that in the select part. But I am not able to do so.
this is what I have tried:
SELECT
Location,
LEVEL,
Active = 'N' --I want to change this in the to N or Y so I can get different results.
FROM
S_ORG_EXT
where
Location = 'North America' and LEVEL ='Software'
OR location = 'North America'
and Active = 'N'
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Feb 11, 2011
I have the following tables:
create table lookups (code varchar2(20), amount number);
insert into lookups values ('Rent' , 500);
insert into lookups values ('Breakpoint' , 10);
create table products (id number, cost number, year varchar2(4));
insert into products values (1, 1000, '2011');
insert into products values (1, 2000, '2011');
insert into products values (2, 100, '2011');
insert into products values (3, 50, '2011');
commit;
I want to write a query which lists the IDs and the sum(cost), and a Y/N indicator which is set to 'Y' IF sum(cost) > ( (lookups.rent value) * (100 - lookups.breakpoint value))/100
I have written this query:
SELECT id,
sum(cost)cost,
year,
CASE
WHEN cost >
((SELECT amount
[code]....... ORDER BY id;
This returns
ID COST YEAR YN
--------- ---------- ---- -
1 1000 2011 Y
1 2000 2011 Y
2 100 2011 N
3 50 2011 N
The YN is correct, but it needs to sum the amounts. So there should only be one row for id1 = 3000.e.g.
ID COST YEAR YN
--------- ---------- ---- -
1 3000 2011 Y
2 100 2011 N
3 50 2011 N
I am not sure how to do this. Or is there a better way of doing this than using CASE.
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May 6, 2011
Below is the query that I have:
Quote:
select a.contact, b.db_name
from MOM.db_contacts@DB_LINK a, MOM.databases@DB_LINK b,
where a.DB_ID=b.DB_ID
and b.DB_name=(SELECT unique substr(upper(t.target_name), 1, instr(t.target_name,'_',1,1)-1)
FROM mgmt_targets t JOIN mgmt_current_severity s
ON s.target_guid = t.target_guid
WHERE t.target_type = 'oracle_database'
and UPPER(t.target_name) like '%11GDB%');
How can I add two more columns into the select statement and the two columns are in the tables that were in the sub query..I would like to have something like this:
Quote:
select a.contact, b.db_name, COLUM1, COLUMN2
from MOM.db_contacts@DB_LINK a, MOM.databases@DB_LINK b, mgmt_targets t, mgmt_current_severity s
where a.DB_ID=b.DB_ID
and b.DB_name=(SELECT unique substr(upper(t.target_name), 1, instr(t.target_name,'_',1,1)-1)
FROM mgmt_targets t JOIN mgmt_current_severity s
ON s.target_guid = t.target_guid
WHERE t.target_type = 'oracle_database'
and UPPER(t.target_name) like '%11GDB%');
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Apr 28, 2010
I have a cursor in a procedure that selects columns from a table on a remote Oracle database using a database link. It all works fine when the table name and database link name is 'hard coded' into the procedure but what I would like to achieve is have the select statement lookup the table name and database link name from a column in another table. See example below
CURSOR c_total_bookings IS
SELECT personnel_id,
surname,
forenames,
birth_date,
[code]...
What I would like to do is replacecompany_bookings@remote.linkwith a variable that takes its value from another table.
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Jun 24, 2011
select GAM.FORACID,
SOL.SOL_DESC,
GAM.ACCT_NAME,
LHT.LIM_SANCT_DATE,
LHT.SANCT_LIM,
to_char( GAM.CLR_BAL_AMT,'9,99,999.99'),
[code]...
i am getting error like this
ERROR at line 9:
ORA-00911: invalid character
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May 3, 2013
Execute Immediate on SELECT Statement
declare l_stmt VARCHAR2(1000);
begin
l_stmt := 'Select * from mytable' ;
EXECUTE IMMEDIATE l_stmt;
--- dbms_output.put_line( l_stmt);
end;
it is not returning any output. I have hardcoded the table name here where as in real time Mytable name will differ.
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Feb 19, 2013
I was given a SQL query to develop another query that will need to do something similar. The query I was given I believe is a stored procedure. It is PL/SQL and has a SELECT statement that looks like
SELECT :var1 AS var1
FROM t1
WHERE
:var1 = 1
In the past I have seen where variables can be used in the WHERE clause like
SELECT c1
FROM t1
WHERE
c1 = :my_column_valueand this makes sense to me.
Usually :my_column_value is declared in the DECLARE block of the PL/SQL. In the query I was given, :my_column_value is not declared in any DECLARE blocks (maybe I wasn't given the entire code??). But even if it was, that would be even more confusing because in the DECLARE block it could be assigned one value and then set to another value in the WHERE clause???
The first query doesn't make sense to me and when I run it as plain SQL I get an error like "SP2-0552: Bind variable "var1" not declared. I am guessing that such a syntax is not valid for regular SQL?
The only thing I can gather that the first query does is something along the lines of
SELECT 1 as var1
so it will output a 1 for every row. Not always that interesting of a query, but it is needed sometimes, I know. But I still don't understand this type of assignment.
So what's going on here? I'd be happy to look it up and read about it myself, but I don't know what to search for.
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Nov 12, 2013
i want a select statement to retrieve the last name added into the "ename" column .i mean :if i insert "jack" into "ename" column , i want to write a select statement to retrieve that last name while i do not know it is jack or any other name ?
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Sep 14, 2013
How to use a function with DML operations in it in a select statement.
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