Performance Tuning :: Update Columns Of One Table Using Another Table

Feb 6, 2011

I am trying to update columns of Table A with the columns of Table B. Both these tables have 60,000 rows each. I tried this operation using following 2 queries:

Query 1

Update TableA A
set
(A.col1,A.col2,A.col3)=(select B.col1,B.col2,B.col3
from TableB
where A.CODE=B.CODE)

Query 2
Update TableA A
set
(A.col1,A.col2,A.col3)=(select B.col1,B.col2,B.col3
from TableB
where A.CODE=B.CODE)
where exists
A.code = (select B.code
from TableB B
where A.code=B.code)

When i execute these two above queries, it keeps executing indefinitely.

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Performance Tuning :: Increase Few Of Columns Size In The Table

Feb 14, 2013

We have a table emp_details with 23772889 records. Our requirement is to increase few of the columns size in the table emp_details. We are following the below alter statement which is taking around 2 hours of time.

ALTER TABLE emp_details
MODIFY
(
address char(90)
,department char(30)
)
/

Is there any way to improve the above query performance?

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Performance Tuning :: Update Million Rows In One Table With Values From Another Tables?

Feb 15, 2011

I am trying to update a million rows in one table with the values from another tables.

Table being updated CI_ADJ_CHAR column CHAR_VAL_FK1
Table from which values will be used CK_ADJ columns (cx_id, ci_id)

The CI_ADJ_CHAR.CHAR_VAL_FK1 values match CK_ADJ.CX_ID and should be updated with the value CK_ADJ.CI_ID.

The CK_ADJ table has 1.3 million rows and both the columns have indexes defined. Table definitiuon mentioned below

The CI_ADJ_CHAR table has 14 million rows and will update 1 million rows and has an index on the ADJ_ID column but not on the CHAR_VAL_FK1 column.

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Performance Tuning :: Unable To Update Newly Added Column In Existing Table

May 21, 2013

I am facing some challenge while running update query on newly added column in existing table.

Environment Details
Oracle 9i, version 9.2.0.6
Os Unix Aix 6.1

No of records in table : 12572770

Below are the step i followed.

1. In table testtablename, I have added new column COLUMNNAME29 with datatype VARCHAR2(8).
2. After adding the new column, i executed the update query to populate the data form COLUMNNAME1 to COLUMNNAME29.
3. The query is executed using COLUMNNAME24 in where clause, to drive query in index based.

SQL> desc testtablename
Name Null? Type
----------------------------------------- -------- ----------------------------
COLUMNNAME1 VARCHAR2(8)
COLUMNNAME2 CHAR(1)
COLUMNNAME3 CHAR(1)
COLUMNNAME4 VARCHAR2(8)
COLUMNNAME5 VARCHAR2(11)

[Code]...

Table altered.

SQL> select index_name, column_position, column_name from dba_ind_columns where table_name = 'TESTTABLENAME' order by index_name,column_position;

INDEX_NAME COLUMN_POSITION COLUMN_NAME
------------------------------ --------------- --------------------------------------------------
IDX_TESTTABLENAME 1 COLUMNNAME24

Problem faced & My analysis

1. The update query is hanging in database, it's not progressing (In single update, approximately 40000 records will get update)
2. No oracle error thrown in alert log or in session where the query being executed.
3. The event for the query is "db file sequential read".
4. When i update the newly added column COLUMNNAME29 with static value "1", the update completed successfully in few seconds.
5. Then i changed the static value to "1111" and executed the update statement, which result to query hanging in database.
6. I tried to update the existing column(COLUMNNAME1) in table with static value "1111", the update completed successfully.

Below are the queries completed successfully

Update Testtablename
Set Columnname29 = '1'
Where Columnname24 >= To_Date('01-12-2002 00:00:00', 'DD-MM-YYYY HH24:MI:SS' )
And Columnname24 < To_Date('01-01-2003 00:00:00', 'DD-MM-YYYY HH24:MI:SS')

[Code]...

Below are the queries hanging in database

Update Testtablename

Set Columnname29 = Columnname1
Where Columnname24 >= To_Date('01-12-2002 00:00:00', 'DD-MM-YYYY HH24:MI:SS' )
And Columnname24 < To_Date('01-01-2003 00:00:00', 'DD-MM-YYYY HH24:MI:SS')

Update Testtablename

Set Columnname29 = '1111'
Where Columnname24 >= To_Date('01-12-2002 00:00:00', 'DD-MM-YYYY HH24:MI:SS' )
And Columnname24 < To_Date('01-01-2003 00:00:00', 'DD-MM-YYYY HH24:MI:SS')

Below is character set in database

SQL> select * from v$nls_parameters;
PARAMETER VALUE
---------------------------------------------------------------- ----------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA

[Code]....

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Performance Tuning :: Update Currency Column Of One Table Using Other Table Currency Column?

May 11, 2012

I am trying to update currency column of one table using the currency column of other table using the following sql code.

update ODS.SO_ITEM OSI
set CURRENCY__CODE=(select currency__code from sa_sales.SO_ITEM SSI where SSI.ID=OSI.ID)

This update is taking taking a lot of time and is never ending.

should i create index on source table (SA_SALES.SO_ITEM) or on target table (ODS.SO_ITEM) ?

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Performance Tuning :: Merge Statement Tuning For 100M Records In Table?

Oct 31, 2011

I have two tables with 113M records in DWH_BILL_DET & 103M in prd_rerate_chg_que and Im running following merge query, which is running for 13 hrs to update records, which is quiet longer time.

SQL> explain plan for MERGE /*+ parallel (rq, 16) */
INTO DWH_BILL_DET rq
USING (SELECT rated_que_rowid,
detail_rerate_flag_code,
rerate_sel_key,

[code].....

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Performance Tuning :: Index 15 Columns When Cannot Predict Columns Will Be Used In Where Clause?

Apr 4, 2011

I am running a fairly busy Oracle 10gR2 DB, one of the tables has about 120 columns and this table receives on average 1500 insertions per second. The table is partitioned and the partitioning is based on the most important of the two timestamp columns. There are two timestamps, they hold different times.

Out of these 120 columns, about 15 need to be indexed. Out of the 15 two of them are timestamp, at least one of these two timestamp columns is always in the where clause the queries.

Now the challenge is, the queries we run can have any combination of the 13 other columns + one timestamp. In reality the queries never have more than 7 or 8 columns in the where clause but even if we had only 4 columns in the where clause we would still have the same problem.

So if I create one concatenated index for all these columns it will not be very efficient because after the 4th or 5th column the sorting would no longer be very useful and I believe the optimiser would simply not use the rest of the index. So queries that use the leading columns of the index in sequence work well, but if I need to query the 10th column the I have performance issues.

Now, if I create multiple single column indexes oracle will have to work a lot harder to maintain all these indexes and it will create performance issues (I have tried that). Besides, if I have multiple single column indexes the optimiser will do nested loops twice or three times and will hit only the first few columns of the where clause so I think it will kind of be the same as the long concatenated index.

What I am trying to do is exactly what the Bitmap index would do, it would be very good if I could use the AND condition that a Bitmap index uses. This way I could have N number of single column indexes which the optimiser could pick from and serve the query with exactly the ones it needs. But unfortunately using the Bitmap index here is not an option given the large amount of inserts that I get on this table.

I have been looking for alternatives, I have considered creating multiple shorter concatenated indexes but this still would not address the issue since many queries would still not be served properly and therefore would take a very long time to complete.

What I had in mind would be some sort of multidimensional index, I am not even sure if such thing exists. But essentially it would be some sort of index that could serve a query efficiently regardless of the fact that the where clause has the 1st, 3rd and last columns of the index.

So considering how widely used Oracle is and how many super large databases there are out there, this problem must be common.

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Oracle SQL - Update Table Value By Matching Columns

Mar 15, 2010

I have two table and trying to update tableA with data from tableB but gives an error. My TableA has columns - colA,colB,colC,colX and table B has columns - colA,colB,colX. Sample data looks like this:

tableA:
XXYY, local,3/19,48
XXYY,ixc,3/19,24
XXYYlocal,3/20,48
XXYY,local,3/21,48

Table B:
XXYY,local,48
XXYY,ixc,24
PPQQ,local,72

this is the query I wrote
update tableA a
set (a.colX)=(select (b.colX) from tableB b where a.colA=b.colA and a.colB=b.colB);

When i run it gives this error:single row subquery returns more than one row.

tableB has only 1 value for colX for each colA,colB record but tableA has mutiple colA and colB repeated but for all of thsoe in table A i want to update the tableB.colX value for matching colA and colB.

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Dec 13, 2011

how to update the middle of plenty rows in the middle of the columns

sample_data

id name state REGION LOC
1 v A.p 1 1
2 a
3 g K.A 0 3
4 y
5 i T.N 1 0
6 l M.P 0 1
7 c U.P

This is sample data,and i have this kind of large data and i need to fill the rows which are empty. In three columns state,region,loc with data like 0,web_intimation,1,

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SQL & PL/SQL :: Create Stored Procedure To Update Columns In Table

Dec 8, 2010

I have three tables fixtures, fixture_teams and team_tbl

fixtures consists of:

create table Fixture_tbl(
fixt_id varchar2(8),
fixt_date date,
fixt_time varchar2(10),
fixt_location location_t,
umpire_id varchar2(8),
player_of_match player_of_match,
home_team varchar2(20),
away_team varchar2(20),
[code]....

creating a stored procedure that updates the points column in the teams_tbl , the value that is updated in to the points column will be retrieved from the fixture_team table. so if team a has more goals than team b then the points column for team a will be increased by 6 else if the scores are equal they get 4 points each.

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SQL & PL/SQL :: Update Column In A Table Which Has 3 Columns Of 16 Million Rows?

Apr 25, 2012

trying to update a column in a table which has 3 columns of 16million rows from column in another table which has 1million rows, there is no relationship between the 2 tables.

Table A has 3 columns of 16million rows, the first two columns have 16million ID numbers, the 3rd colunm is currently NULL.

Table B has 1million Numbers, i need to somehow update column 3 in table A using the numbers in table B, it doesnt how many times each of the 1 million numbers are used but i dont want it to just update every row to the same value.

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Forms :: INSERT Record - Update Columns Of Table

May 31, 2010

I would like to UPDATE the columns p1 and p2 of my table student (studentid:pk,name,p1,p2,...) for a given studentid.and I have a when-button-pressed trigger with this

UPDATE student
SET student.p1=:validation.proj1,
student.p2=:validation.proj2
where UPPER(student.studentid)=UPPER(:validation.studentid);commit_form;

when I run my form with a correct studentid, I got this error: FRM-40508: ORACLE error: UNABLE to INSERT record

but it is cworking correctly in sqlplus; and I have all priveligies.

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Jun 24, 2011

Below query is taking a long time...

select gam.SOL_ID,COUNT(gam.FORACID) from gam,smt where
gam.ACID=smt.ACID and gam.ACID NOT IN(select ACID from imt) and
gam.SCHM_TYPE in('SBA','CCA','CAA','ODA') and GAM.ACCT_CLS_FLG='N' and
gam.SOL_ID IN(select SOL_ID from IMT) group by gam.SOL_ID
/

attached is the explain plan.

in which index on IMT table is not used. And the query is doing a FTS on IMT table. What needs to be done to avoid FTS on IMT table.

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Performance Tuning :: Partition Of Table

Jun 28, 2010

What are the factors that decide on which column we should partition the table and which partition method we should chose.

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Aug 3, 2010

I am using one script to delete the records from a table, its taking 1hr to delete.

declare
cursor c1 is select ownerid,ownertype from nightly_metric_projects
;
v1 c1%rowtype;
open c1;
loop
fetch c1 into v1;
exit when c1%notfound;
DELETE FROM DGT_ITEMEFFORTDATA WHERE OWNERTYPE = c1.OWNERTYPE
AND OWNERID = c1.OWNERID;
end loop;
close c1;
commit;

nightly_metric_projects--1200 records
DGT_ITEMEFFORTDATA--13200000

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Aug 4, 2010

I have normal tables with hugh Data and would like to increase the performace by following means:

1) Add a new column in each table. Say this column Name is IS_LIVE. This new column have only two value 1 ( LIVE ) OR 0 ( NOT LIVE ).
2) Change the normal tables to Partitioned table. There would be only two partitioned in all the table. The partitioned key column would be IS_LIVE and both partitioend recrods would be in two different tablespace.
3) Added a POLICY function to these partitioned table to Always add a Query Predicate of '1' to all queuries.

I am interested to know that what kind of Indexes ( Global Or local ) would be suitable for these kind of Design.Is there any use of having Local index on IS_LIVE.Please note that Primary Key doesnot have this new column in it.

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Sep 26, 2012

what analyzing a table does to existing indexes? Do I need to rebuild the indexes after dbms_stats.gather_table_stats command ?

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May 9, 2011

Objective : To find solution to archieve data from 2 big tables which is occupying maximum size in the data base. With current data (From Jan 2005 to Sept 2011) it has records as mentioned below:

transaction - 41687927
trnansaction_dtl - 83945934

We need to load data and run monthly batches from October 2011 to current month which will increase this space.

1. Issue is there will not be having so much space.

2. Maintenance of such table is diffcult now.Also there is huge impact on performance. Can we think of partitioning the table base on date aswe query 1st table based on certain date range?

3. Most of reports use this table and creating performances issues

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Jun 17, 2011

We have few tables in our production database which are havoc in size and will increase in size in future too so as part of the corrective measures , we have jotted down the below 3 methods to manage the size of those tables :-

1> Partitioning the table and take the export of identified partitions and after that, truncate those partition.
2> Creating history tables and remove not so current data from the original table to history table.

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Dec 29, 2011

I have tried below steps for removing the table fregmentation but for some table i am not getting good result here.

1. It will collect the data which are having more than 100MB fragmentation.

select owner,table_name,blocks,num_rows,avg_row_len,round(((blocks*8/1024)),2)||'MB' "TOTAL_SIZE", round((num_rows*avg_row_len
/1024/1024),2)||'Mb' "ACTUAL_SIZE", round(((blocks*8/1024)-(num_rows*avg_row_len/1024/1024)),2) ||'MB' "FRAGMENTED_SPACE" from
dba_tables where owner in('a','b','c','d') and round(((blocks*8/1024)-(num_rows*avg_row_len/1024/1024)),2)
> 100 order by 8 desc;

2. then move the object(table) to the same tablespace.

alter table abc move;
alter table bcd move;
alter table efg move;

3. also rebuild the dependent objects.

alter index abc_PK rebuild online;

4. Then analyze the table which are having more than 100MB of fragmentation.

exec dbms_stats.gather_table_stats('a','abc');
exec dbms_stats.gather_table_stats('b','bcd');
exec dbms_stats.gather_table_stats('c','cdf');

after that when check the table fragmentation, i am getting the same result, which i have collected from the 1st query.

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Apr 27, 2012

From the below query i found that there are some stale stats for 3 tables.

=================================
select table_name, stale_stats, last_analyzed
from dba_tab_statistics
where owner= 'SYSADM' and stale_stats='YES'
order by last_analyzed desc

I collect stats for those above 3 tables with dbms_stats.gather_table_stats().But no luck.After collection of stats immediately I ran the above query.But still it is showing there are stale stats for 3 tables.

how can I change "STALE-STATS" status, so that optimizer can use the updated stats eficiently.

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Sep 4, 2011

If a table(have a primary key) is empty(after truncate),the sql of dml(insert,update) is very quickly,but if the table have many rows about 10,000,000 rows, the dml is very slowly,why?

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Aug 8, 2013

Is it possible for the DBMS_STATS "LIST STALE" command to show a stale partition but NOT have its table show as stale?

I had a scenario where the table itself AND 1 partition showed as stale. I ran a fnd_stats gather table stats just on that 1 partition. Once it was completed it showed the partition to no longer be stale. it also showed that the table was no longer stale. so I guess I do not need to run stats on the whole table as well?

so if this is the case, when would I need to run stats on the full partitioned table if running it on the partitions themselves removes the staleness of the table?

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Mar 19, 2012

1.2 million chained rows, 1.7 million blocks, etc. Initial extent for this table is 64k and next 1 mb. I would try to calculate this out better for efficiency and performance. This will not be efficient as it stands. calculate the size.

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Aug 26, 2011

I am working with an online application with the database in Oracle 10G. We have a table with 10 million rows and this table is subjected to grow in future also. Moreover we cannot archive some of these rows as these records are required for referencing.

We have all necessary indexes on the table but querying this table takes a lot of time especially when it is joined with other tables. some methods with which I can manage this table in a better way so that queries joining this table would execute faster..

SELECT
TAB1.C6,
TAB1.C8,
TAB1.C10,
TAB3.C4,

[code]....

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Oct 23, 2012

We are on Oracle 10.2.0.4 on Solaris 10. There is a table in my production db that has 872944 number of rows. Most of its data is now unnecessary, we need to retain, based on a date column in the table just last one month's data and delete rest of the data. So after that the table will have just 3000 rows.

However as the table was huge earlier(872k rows prior to delete) , does the delete of data release its oracle blocks and does the size of the table reduce? If not, will it rebuild the table online (online redefinition) so that the query that does a full scan on this table goes faster?

I checked using an example table that just delete of data does not remove the oracle blocks - they remain in the user_tables for that table and cost of full table scan remains same. We have a query that does the full table scan so I am thinking that after this delete I should do an online table re-definition , is that the right decision?

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Sep 23, 2010

When i run a script that does a select from a single table (table has 33521868 records)the query is executed in about .094 seconds. I use the exact same query to insert into a temporary table and the query takes 10 minutes and more.

What should I be doing to speed up this process. Also tried using hints and it does not speed up the insert.

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Apr 27, 2012

I have a table which contains 8,21,177 amount of data totally.Now I am trying to delete around 4,84,000 of data from this table by using just one filter i.e. my query is something like below

DELETE /*+ parallel(resource,4) */ FROM resource where created_by = 'MIGN'

This is going to delete 4,84,000 rows of data . But my current issue is this is taking lots of time to delete the data . To be precise , its almost taking 25 hours to delete this data..The created_by column is indexed .

Execution Plan
----------------------------------------------------------
Plan hash value: 2389236532

| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time
|
--------------------------------------------------------------------------------

| 0 | DELETE STATEMENT | | 499 | 20459 | 39 (0)| 00:00:
01 |

| 1 | DELETE | RESOURCE | | | |
[code]....

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Oct 15, 2013

I am inserting data using a procedure for 2012 and 2013 year which is using partitioned tables includes crore of data in a partition taking lot of time or taking months. Is there any other way by which I can insert data fast from our query.

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Dec 13, 2011

By default the DBMS_STATS package runs once every 24 hours to collect statistics for database objects and Oracle collects new statistics when enough of the data (about 10%) has changed.

My question here is how to check the table has changed 10% in database?

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