What lock does the Update Statement use?

Hi All,
Does the below statement will put a row level lock or exclusive lock.
update employee set emp_name='Emp1' where emp_id=1;
Regards
W

UKJA@ukja102> drop table t1 purge;
Table dropped.
Elapsed: 00:00:00.93
UKJA@ukja102> create table t1(c1 int);
Table created.
Elapsed: 00:00:00.09
UKJA@ukja102>
UKJA@ukja102> insert into t1 values(1);
1 row created.
Elapsed: 00:00:00.00
UKJA@ukja102> commit;
Commit complete.
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> update t1 set c1 = 2;
1 row updated.
Elapsed: 00:00:00.00
UKJA@ukja102>
UKJA@ukja102> set serveroutput on
UKJA@ukja102>
UKJA@ukja102> col sid new_value my_sid
UKJA@ukja102>
UKJA@ukja102> select sid
2 from v$mystat where rownum = 1
3 ;
       SID
       139
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> exec print_table('select * from v$lock where sid = &my_sid');
ADDR                          : 695C4224
KADDR                         : 695C423C
SID                           : 139
TYPE                          : TM
ID1                           : 74212
ID2                           : 0
LMODE                         : 3
REQUEST                       : 0
CTIME                         : 0
BLOCK                         : 0
ADDR                          : 69612444
KADDR                         : 69612560
SID                           : 139
TYPE                          : TX
ID1                           : 458787
ID2                           : 13053
LMODE                         : 6
REQUEST                       : 0
CTIME                         : 0
BLOCK                         : 0
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.14DML acquires TX lock in exclusive(6) mode(row level lock) and TM lock in row exclusive(3) mode.
=======================================
Oracle Performance Storyteller
Dion Cho
http://ukja.tistory.com
http://wiki.ex-em.com/index.php/performance_in_depth
http://wiki.ex-em.com/index.php/optimizing_oracle_optimizer
=======================================

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Problem in doing an update statement

Hello all
i should write an update statement,
these tables : country: name,code,population,nextyearr_population ...
nextyear_population is empty,at first i should get population_growth from population table then calculate the next year population according to corrent population and population_growth
population: country(actually is code not name of country) ,population_growth,....
i wrote so and i got this error
Error starting at line 1 in command:
update country c
set c.nextyear_population=(c.population+ ((c.population*(select pop.population_growth from population pop join country co on co.code=pop.code))/100)
where country.code=population.country
Error at Command Line:4 Column:20
Error report:
SQL Error: ORA-00904: "POPULATION"."COUNTRY": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:
*Action:
-- File created - Wednesday-May-15-2013
-- DDL for Table COUNTRY
CREATE TABLE "intern"."COUNTRY" ("NAME" VARCHAR2(40), "CODE" CHAR(2), "CAPITAL" VARCHAR2(40), "PROVINCE" VARCHAR2(40), "POPULATION" NUMBER, "AREA" NUMBER, "NEXTYEAR_POPULATION" NUMBER)
   COMMENT ON COLUMN "intern"."COUNTRY"."NAME" IS 'the country name'
   COMMENT ON COLUMN "intern"."COUNTRY"."CODE" IS 'the internet country code (two letters)'
   COMMENT ON COLUMN "intern"."COUNTRY"."CAPITAL" IS 'the name of the capital'
   COMMENT ON COLUMN "intern"."COUNTRY"."PROVINCE" IS 'the province where the capital belongs to'
   COMMENT ON COLUMN "intern"."COUNTRY"."POPULATION" IS 'the population number'
   COMMENT ON COLUMN "intern"."COUNTRY"."AREA" IS 'the total area'
   COMMENT ON TABLE "intern"."COUNTRY" IS 'the countries of the world with some data'
REM INSERTING into intern.COUNTRY
SET DEFINE OFF;
Insert into intern.COUNTRY (NAME,CODE,CAPITAL,PROVINCE,POPULATION,AREA,NEXTYEAR_POPULATION) values ('Andorra','ad','Andorra la Vella','Andorra la Vella',69865,468,null);
Insert into intern.COUNTRY (NAME,CODE,CAPITAL,PROVINCE,POPULATION,AREA,NEXTYEAR_POPULATION) values ('United Arab Emirates','ae','Abu Dhabi','Abu Dhabi',2523915,82880,null);
Insert into intern.COUNTRY (NAME,CODE,CAPITAL,PROVINCE,POPULATION,AREA,NEXTYEAR_POPULATION) values ('Afghanistan','af','Kabul','Kabul',28513677,647500,null);
-- File created - Wednesday-May-15-2013
-- DDL for Table POPULATION
CREATE TABLE "intern"."POPULATION" ("COUNTRY" CHAR(2), "POPULATION_GROWTH" NUMBER, "INFANT_MORTALITY" NUMBER)
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   COMMENT ON COLUMN "intern"."POPULATION"."POPULATION_GROWTH" IS 'population growth rate (percentage, per annum)'
   COMMENT ON COLUMN "intern"."POPULATION"."INFANT_MORTALITY" IS 'infant mortality (per thousand)'
   COMMENT ON TABLE "intern"."POPULATION" IS 'information about the population of the countries'
REM INSERTING into intern.POPULATION
SET DEFINE OFF;
Insert into intern.POPULATION (COUNTRY,POPULATION_GROWTH,INFANT_MORTALITY) values ('ad',0.95,4.05);
Insert into intern.POPULATION (COUNTRY,POPULATION_GROWTH,INFANT_MORTALITY) values ('ae',1.54,14.51);
Insert into intern.POPULATION (COUNTRY,POPULATION_GROWTH,INFANT_MORTALITY) values ('af',4.77,163.07);thank you in advance
im using oracle11g and ubuntu 12
best,david

Hi, David,
Thanks for posting the CREATE TABLE and INSERT statements.
Don't forget to post the results you want from thatsample data (that is, the contents of country after everything is finished).
1003209 wrote:
... i wrote so and i got this error
Error starting at line 1 in command:
update country c
set c.nextyear_population=(c.population+ ((c.population*(select pop.population_growth from population pop join country co on co.code=pop.code))/100)
where country.code=population.country
Error at Command Line:4 Column:20
Error report:
SQL Error: ORA-00904: "POPULATION"."COUNTRY": invalid identifier
00904. 00000 - "%s: invalid identifier"
In the UPDATE statement itself (outside of sub-queries) you can only reference the table being UPDATEd, but in the WHERE clause:
where country.code=population.countryyou're trying to reference another table, population. That's what caused the error.
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'Missing select' error for update statement using WITH clause

Hi,
I am getting the below error for update statement using WITH clause
SQL Error: ORA-00928: missing SELECT keyword
UPDATE A
set A.col1 = 'val1'
     where
A.col2 IN (
WITH D AS
SELECT col2 FROM
(SELECT col2, MIN(datecol) col3 FROM DS
WHERE <conditions>
    GROUP BY PATIENT) D2
WHERE
<conditions on A.col4 and D2.col3>

Hi,
The format of a query using WITH is:
WITH d AS
    SELECT ... -- sub_query
SELECT ...   -- main query
You don't have a main query. The keyword FROM has to come immediately after the right ')' that ends the last WITH clause sub-query.
That explains the problem based on what you posted. I can't tell if the real problem is in the conditions that you didn't post.
I hope this answers your question.
If not, post a complete test script that people can run to re-create the problem and test their ideas. Include a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the results you want from that data.
In the case of a DML operation (such as UPDATE) the sample data should show what the tables are like before the DML, and the results will be the contents of the changed table(s) after the DML.
Explain, using specific examples, how you get those results from that data.
Always say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002

What exactly does the colaece option do in TOAD software

Hi,
What exactly does the colaece option do in TOAD software.
Regards,
MuruguPandian P

Coalesce will take ADJACENT free space and coalesce it into one larger free chunk.
A free extent in a dictionary-managed tablespace is made up of a collection of contiguous free blocks. When allocating new extents to a tablespace segment, the database uses the free extent closest in size to the required extent. In some cases, when segments are dropped, their extents are deallocated and marked as free, but adjacent free extents are not immediately recombined into larger free extents. The result is fragmentation that makes allocation of larger extents more difficult.
You should often use the ALTER TABLESPACE ... COALESCE statement to manually coalesce any adjacent free extents. To Coalesce a tablespace give the following command
SQL> alter tablespace ica coalesce;
Source: http://www.oracle-dba-online.com/tablespaces_and_datafiles.htm
Regards
Asif Kabir

Is it possible that my update stats used only correct tables?

Whenever there is a schedule maintenance run I receive a error:
Executing the query "UPDATE STATISTICS [Perf].[PerfHourly_F65954CD35A54..." failed with the following error: "Table 'PerfHourly_F65954CD35A549E886A48E53F148F277' does not exist.". Possible failure reasons: Problems with the query, "ResultSet"
property not set correctly, parameters not set correctly, or connection not established correctly.
Is it possible that my update stats used only correct tables?
Thanks

Use below script ...(change if required)
USE [dbname]
go
DECLARE @mytable_id INT
DECLARE @mytable VARCHAR(100)
DECLARE @owner VARCHAR(128)
DECLARE @SQL VARCHAR(256)
SELECT @mytable_id = MIN(object_id)
FROM sys.tables WITH(NOLOCK)
WHERE is_ms_shipped = 0
WHILE @mytable_id IS NOT NULL
BEGIN
SELECT @owner = SCHEMA_NAME(schema_id), @mytable = name
FROM sys.tables
WHERE object_id = @mytable_id
SELECT @SQL = 'UPDATE STATISTICS '+ QUOTENAME(@owner) +'.' + QUOTENAME(@mytable) +' WITH ALL, FULLSCAN;'
Print @SQL
EXEC (@SQL)
SELECT @mytable_id = MIN(object_id)
FROM sys.tables WITH(NOLOCK)
WHERE object_id > @mytable_id
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END
Or use below for required table only but it will not execute only generate script, make change as per ur requirements:
SELECT X.*,
ISNULL(CASE
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    THEN
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        THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name] + ' WITH ALL, FULLSCAN --20% Small Table Rule'
      END
    WHEN [Percent Modified] = 100.00
    THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN --100% No real Stats Rule'
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    ELSE
      CASE
        WHEN X.[Total Rows] > 1000000000 --billion rows
        THEN CASE
               WHEN [Percent Modified] > 0.1
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 1B Big Table Rule'
             END
        WHEN X.[Total Rows] > 100000000 --hundred million rows
        THEN CASE
               WHEN [Percent Modified] > 1.0
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 100M Big Table Rule'
             END
        WHEN X.[Total Rows] > 10000000   --ten million rows
        THEN CASE
               WHEN [Percent Modified] > 2.0
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 10M Big Table Rule'
             END
        WHEN X.[Total Rows] > 1000000    --million rows
        THEN CASE
               WHEN [Percent Modified] > 5.0
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 1M Big Table Rule'
             END
        WHEN X.[Total Rows] > 100000     --hundred thousand rows
        THEN CASE
               WHEN [Percent Modified] > 10.0
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 100K Big Table Rule'
             END
        WHEN X.[Total Rows] > 10000      --ten thousand rows
        THEN CASE
               WHEN [Percent Modified] > 20.0
               THEN 'UPDATE STATISTICS ' + [Schema Name] + '.' + [Table Name]     + ' WITH ALL, FULLSCAN -- 10K Big Table Rule'
             END
        END
END,'') AS [Statistics SQL]
FROM (
SELECT DISTINCT
        DB_NAME()   AS [Database],
        S.name      AS [Schema Name],
        T.name      AS [Table Name],
        I.rowmodctr AS [Rows Modified],
        P.rows      AS [Total Rows],
        CASE
          WHEN I.rowmodctr > P.rows
          THEN 100
          ELSE CONVERT(decimal(8,2),((I.rowmodctr * 1.0) / P.rows * 1.) * 100.0)
        END AS [Percent Modified]
FROM
        sys.partitions P
        INNER JOIN sys.tables T ON P.object_Id = T.object_id
        INNER JOIN sys.schemas S ON T.schema_id = S.schema_id
        INNER JOIN sysindexes I ON P.object_id = I.id
WHERE P.index_id in (0,1)
AND I.rowmodctr > 0
) X
WHERE [Rows Modified] > 1000
ORDER BY [Rows Modified] DESC
Please click "Propose As Answer"
if a post solves your problem, or "Vote As Helpful" if a post has been useful
to you

Why does the update change my home page and make Google so prevelant?

Several of the last "updates" involved the changing of my bookmarks and home page,. The so called update required me to spend more time in refreshing the browser to its previous condition. This is frustrating to say the least. Second why does the updated version of of firefox seem to favor google?

Normally, an update does not change your home page...
What did you home page change to? That might help identify the source of the problem.
I assume you have tried changing your home page back to your preferred site, either in the Options dialog or using one of the other methods:
* [[Startup, home page and download settings]]
* [[How to set the home page]]
Did that work at all? By "at all" I mean:
* Immediately after making the change, if you click the Home button, or launch a new window using Ctrl+n, does your preferred page load? Or is that ignored?
* Does the setting revert later in your session (you see in Options it has changed)?
* Does the setting revert after you exit and start Firefox up again?
* Is the problem only when you use your Firefox desktop shortcut?
With that information, it will be easier to recommend a solution.
I'm not sure I understand your second question. Google has always been the default search provider in Firefox. Are you seeing even more Google than that?

What lock does the Update Statement use?

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