SQL & PL/SQL :: Update Statement For OLTP Table

May 14, 2013

I have a table TEMP_TEST_1 to be loaded with multiple rows which contains the available items for a store with their sequence numbers. I also have another table TEMP_INV_1 which holds a column for inventory count of the items, and this column is to be updated after loading the first table TEMP_TEST_1.

The table TEMP_TEST_1 is updated through all possible channels in OLTP. So while updating the inventory, which is the best way. My update should either add the total number of inserts per item into the TEMP_TEST_1 table's INVENTORY_CNT column i.e. existing value + count of new rows OR a full update by taking the complete row count (Grouped by item id) and update the INVENTORY_CNT column

--------------------------------------------------------------------------------
-- Initial setup SQL's, TEMP_TEST_1 is updates on OLTP through multiple channels
--------------------------------------------------------------------------------
CREATE TABLE TEMP_TEST_1 ( ITEMID NUMBER ( 4 ),
INVENTORY_CNT NUMBER ( 2 ) );
CREATE TABLE TEMP_INV_1 ( ITEMID NUMBER ( 4 ),
ITEMSEQ NUMBER ( 5 ) );
INSERT INTO
[code].......

--------------------------------------------------------------------------------
-- Inserts for new items in the store
--------------------------------------------------------------------------------
INSERT INTO
TEMP_INV_1
VALUES
( 1,
11 );
INSERT INTO
TEMP_INV_1
[code].......

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SQL & PL/SQL :: Update Statement - Calculating Few Values From Large Table

Sep 2, 2011

I have a large table and want to calculate just a few values. Therefore, I don't want to create a new table, I want to update the table. Here an example:

I want to calculate the VALUE_LAG with ID = 4 only (-> two values).

create table zTEST
( PRODUCT number,
ID number,
VALUE number,
VALUE_L1 number );

[Code]..

I tried this, but obviously, windows functions are not allowed in the update statement.

update zTEST
set VALUE_L1 = lag(VALUE) over (partition by PRODUCT, order by ID)
where ID = 4

How can I do this?

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Update Statement Versus Cursor Based Update

Sep 7, 2010

I have to update 20 and 60 million records of a table. The update statement are

1> 20 million recs
update mycustomer set update_time=add_months(sysdate,240) where seq_num = 1;

commit;

2> 60 million recs
update mycustomer set update_time=sysdate-seq_num where seq_num <> 1;

commit;

Q1> Is there any way to improve performance
Q2> Will parallel dml improve performance
Q2> Would a pl/sql cursor make any difference in speed.

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SQL & PL/SQL :: Update Statement With Join Only Update Matching Rows

Aug 17, 2010

This is my query:

UPDATE t_tt_hours a
SET a.sak_request = (
SELECT b.sak_request
FROM t_requests b, co c

[Code]...

The problem I am having is that it is updating all rows even when it is pulling back a null value for b.sak_request. I've tried adding b.sak_request is not null to the select statement like this:

UPDATE t_tt_hours a
SET a.sak_request = (
SELECT b.sak_request
FROM t_requests b, co c
WHERE b.nam_eds_tracking_id = c.id_dir_track_eds

[Code]...

but it doesn't seem to make a difference. The reason I need to do this is that the difference between where it matches with a valid (non-null) value is 396 rows vs. 12,484 rows which is too time consuming to run on my page.

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PL/SQL :: Update Multiple Columns With Single Update Statement

May 30, 2013

i am reading the columns value from different table but i want to update it with single update statement. such as how to update multiple columns (50 columns) of table with single update statement .. is there any sql statement available i know it how to do with pl/sql.

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SQL & PL/SQL :: How To Update Multiple Rows With Different Values Using Update Statement

Mar 21, 2011

I have one doubt about update command in sql. How to update the multiple rows with different values using update statment.

Eg:-

SQL> set linesize 500;
SQL> set pagesize 500;
SQL> select * from emp;
SQL> select empno,ename,sal from emp;
SQL> select empno,ename,sal from emp;

EMPNO ENAME SAL
---------- ---------- ----------
7839 KING 5000
7698 BLAKE 2850
7782 CLARK 2450
7566 JONES 2975
7654 MARTIN 1250

[Code]....

The above table contains 14 records. Now i would like to update the salary column with different values like

EMPNO SAL
===========
7839 18000
7698 20000
7782 5000
...
...
...
7934 25000

How to update above values with single update query.

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Update Statement Which Updates User IDs In One Table With User IDs In Another Table?

Jun 17, 2009

I am trying to write an update statement which updates the User IDs in one table with the User IDs in another table. However I need to update statement to ignore any duplicates that are in the tables.

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Server Administration :: OLTP Environment On 10g?

Apr 29, 2010

I have to create/configure the environment for the database having high volume of the transactions nearly 10000 transactions per day and at peak time nearly 1500 transactions per second.

RAC can be one of the solution but that comes up with high cost. I googled for this type of environment configuration, what could be possible settings need to be configured for this environment configuration in both RAC and Non-RAC.

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Exadata :: Enable OLTP Compression On Tables

Sep 2, 2012

I am trying to enable OLTP compression on tables and at tablespace level for the tables

Steps I am following are:

1. Move indexes to its own tablespace
2. enable OLTP compression at table level:
alter table table_name move compress for OLTP
3. Rebuild indexes
4. Issue I have is what to do with tables with LOB columns
ALTER TABLE lob_table MOVE LOB (LOB_COL) STORE AS (TABLESPACE index_tbsp); -- Is this correct?
5. alter tablespace data_tablespace default compress for OLTP;

I have a question, is the sequence of steps correct. For tables with LOB columns do we needto move lobindex to index tablespace. Beacuse lobsegment and lobindex are created in data tablespace?

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SQL & PL/SQL :: Update Statement (lag)

Aug 10, 2011

I have a table zTest with several products:

create table zTEST
( PRODUCT number,
ID number,
Flag number,
FLAG_L1 number );

[Code]...

The field FLAG_L1 is the field FLAG with a Lag 1 (order by ID, partition by PRODUCT). I want to write the field FLAG_L1 in an update statement, how can I do this?

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Performance Tuning :: Capacity Planning For 250 User OLTP Shop

Mar 19, 2013

installing Oracle for a new Data-Center(still in planning).It will be an OLTP shop working 24/7, with 250 concurrent users.

1. Can it, in theory run with good performance on a quad processor(something like Intel Xeon Series 56XX) , with 32GB of memory?
2. What is the Oracle Database Edition required for this configuration?
3. What additional things should one take into account to plan the most cost-effective configuration?

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Performance Tuning :: Cursor Sharing Setting In OLTP Environment?

Feb 22, 2011

In an OLTP environment what cursor_sharing setting is preferred?Though typically we retain the original setting for most of the parameters except memory settings etc. I have queries in the following context

No. I am not facing any issue as of now (I am not supporting any Live environment) But I want to know the desgn considerations

First of all in OLTP environment (say one I am referring) we use pl/sql variables which are obviously bind variables Only in case where plan is expected to change we use hard coded values like 'CREDIT' or 'DEBIT' etc. for acc_type column

Again there can be 2 scenario
1) we use the same query for both acc_type values
2) we use 2 different queries
IF v_parameter = 'CR'
select * from accounts where acc_type='CREDIT'...
else
select * from accounts where acc_type='DEBIT'...
end if;

Again suppose the values are skewed and we gather stats with histograms hereIs't it the setting 'cursor_sharing=similar' which will be useful in above case?as with this setting optimizer will 'think' which plan to pick depending upon the values and bind variable peeking is taken care in option 2 above with IF ELSE clause?

BTW
I have carried several tests but not getting conclusive results For example I created following table with skewed data, created index and gather stats with histogram

SQL> select object_id,count(*) from skewed_data_tab group by object_id;

OBJECT_ID COUNT(*)
---------- ----------
5 30
6 2970
7 10797
8 150000
9 300000

SQL> create index i_skewed_tab_data on skewed_data_tab(object_id);

SQL> exec dbms_stats.gather_table_stats(user,'SKEWED_DATA_TAB',cascade=>true,
method_opt=>'for all columns size 254');

Then traced with following options
1) alter session set events '10046 trace name context forever, level 12';

SQL> begin
for i_outer in(select n from ids order by tstamp)
loop
for i_inner in (select /* for exact */ object_id,object_name,object_type
from skewed_data_tab where object_id=i_outer.n)

[code]...

2) set termout off
alter session set events '10046 trace name context forever, level 12';
@/u04/scripts/exact.sql 5
cat /u04/scripts/exact.sql
select /* for exact */ object_id,object_name,object_type from skewed_data_tab where object_id=&1;

But not getting consistent results

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Variable Usage In Type Of Table Declaration Statement And Execute Immediate Statement

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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UPDATE Statement Tuning

Dec 6, 2011

I have a below UPDATE STATEMENT and it is taking more than 1hr to complete. tune this to complete as quick as possible.

UPDATE A_TABLE A
SET FLG= 1
WHERE EXISTS (SELECT ID FROM B_TABLE B where A.ID=B.ID);

Count of the table A_TABLE --- 16,331,441
Count of the table B_TABLE --- 1,271,903

We have index on B.ID and A.ID

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SQL & PL/SQL :: Can A Procedure Be Used In Update Statement

Aug 2, 2011

PROCEDURE split_name (
full_name IN VARCHAR2,
name1 OUT VARCHAR2,
name2 OUT VARCHAR2,
name3 OUT VARCHAR2,
name4 OUT VARCHAR2,
name5 OUT VARCHAR2
)

the above is the procedure declaration. i want to use this function in updating the records in a table. this procedure is working fine in forms and it is splitting the names perfectly and i dont know how to use this in update statement as it is not returning anything like functions do.

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SQL & PL/SQL :: Get Old Value Of Column In Update Statement

Sep 17, 2007

While updating a table, is it possible to get the old value of a column. I need to get it inside a PLSQL block and not in a trigger.for example :-

DECLARE
l_amountNUMBER(5) := 0;
BEGIN
UPDATECustTransactions
SETamount = 150
WHEREcust_id = 5412
RETURNING amount INTO l_amount;
DBMS_OUTPUT.PUT_LINE ( 'l_amount= ' || l_amount );
END;

By using the RETURNING clause i am getting the new updated value. I need the old value for some processing. Do i have to explicitly query it before the update stmt? Pls reply.

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PL/SQL :: Index Ignored While Using Update Statement?

Nov 26, 2012

I am having trouble figuring out why an update statment is ignoring the primary kiy index when performing an update through the application. The index IS used when the update is run from sql*plus or other sql tools.

The statement is very simple:
update ITEM_MASTER set COST = :1 where SMARTPART_NUM = :2;
ITEM_MASTER has unique, primary key index on SMARTPART_NUM

When I use OEM and other tools, I can see the index is not used in the exlain plan, and the query has a high CPU cost due to the full table scan. The table is analyzed, lately using 100%. Table rowcount is 229768

SELECT column_name, num_distinct, num_buckets, histogram, trunc(last_analyzed) ANALYZED FROM USER_TAB_COL_STATISTICS
WHERE table_name = 'ITEM_MASTER' AND column_name = 'SMARTPART_NUM';

COLUMN_NAME NUM_DISTINCT NUM_BUCKETS HISTOGRAM ANALYZED
------------------------------ ------------ ----------- --------------- ---------
SMARTPART_NUM 198417 254 HEIGHT BALANCED 25-NOV-12

The database is Oracle Database 10g Release 10.2.0.4.0 - 64bit Production (on Windows, standard edition)

Here are parameters related to optimizer:
optimizer_dynamic_sampling integer 2
optimizer_features_enable string 10.2.0.4
optimizer_index_caching integer 0
optimizer_index_cost_adj integer 100
optimizer_mode string ALL_ROWS
optimizer_secure_view_merging boolean TRUE

We've tried rebuilding the indexes then re-analyzing, dropping stats and locking at zero, using various sample sizes; none have any impact.

We wondered if the bind variables are causing this, though in testing outside the application, we tried pl/sql and sql batches to mimic the passing of values into the binds, and all still used the index.

Other than putting a hint into SQL in the application (we'd have to ask for a customization), how can I "fix" the database to use the index? In other words, how can I make the database see that the cost of a FTS is much higher than using the index, whenever it sees these updates (either from sql or the application)? This is the simplest example, but we have 4-5 SQL updates on this and other tables that are ignoring the indexes and using full table scans, so we'd like to fix it for all.

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PL/SQL :: Row Locking During Update Statement?

Aug 9, 2013

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.

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SQL & PL/SQL :: Update Statement By Joining 2 Tables

Mar 24, 2012

I have a table called test_renames that has two columns(new_name and old_name) and one row with the following values

NEW_NAME OLD_NAME
DRUG10 DRUG1

I have another table called SH0 that has 10,000 rows and the column of interest is called ITEM1. ITEM 1 contains the following distinct drug names:

DRUG1,DRUG2,DRUG3,DRUG4,DRUG5

Each DRUG has multiple rows associated with it.

I need to only update rows for DRUG1 and set the name from DRUG1 to DRUG10 for all rows where ITEM1 is DRUG1.

However I need to write this update statement by joining with the values in the test_renames table that contains the NEW_NAME and the OLD_NAME.

DRUG1 has 2,000 rows associated with it. The following SQL statement gives me 2,000 rows

(SELECT NVL(CHG.NEW_NAME, SH.ITEM1)
FROM test_renames CHG,sh0 sh
WHERE UPPER(SH.ITEM1) = UPPER(CHG.OLD_NAME)
AND UPPER(SH.ITEM1) IN (SELECT UPPER(OLD_NAME) from test_renames))

However when I run the following update statement, it appears that the SQL query updates all the 10,000 rows in the table instead of just touching the 2,000 rows for DRUG1. It does change all the rows for DRUG1 to DRUG10, but all the other ITEM1 values become null. What I need from the update statement is only chnage the rows for DRUG1 to DRUG10 and leave the other rows that I associated with DRUG2, DRUG3 etc. Here is my update statement.

UPDATE SH0 SH
SET ITEM1 = (SELECT NVL(CHG.NEW_NAME, SH.ITEM1)
FROM test_renames CHG
WHERE UPPER(SH.ITEM1) = UPPER(CHG.OLD_NAME)
AND UPPER(SH.ITEM1) IN (SELECT UPPER(OLD_NAME) from test_renames))

This update statement touches all 10,000 rows. I am looking to update only the relevant 2,000 rows for DRUG1.

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Forms :: Update Statement On Button?

Apr 16, 2010

I try to apply update statement on the button for the specific records, the command does executes if in the end i write execute_query it always asks for do u wanna save the records, yes or no. I want to remove that message. Also if i write commit it does remove that message but everytime i press the button it updates the old record fine but also adds one more entry for the same record.

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SQL & PL/SQL :: Update Statement Using Multiple Tables

Aug 26, 2010

I am issuing an update statement in which I am using multiple tables it is giving me an error " set keyword missing"

update E_CONT_DETAIL_NUMB_VALUE ecdnv, y_obj_category yoc, t_contact tc
set ecdnv.ContTPRecCount = 1000
where tc.default_category_id = (select primary_key from y_ojb_category where tree_position = 'CONT')
and ecdnv.detail_field_id=tc.default_category_id;

update E_CONT_DETAIL_NUMB_VALUE ecdnv, y_obj_category yoc, t_contact tc
*
ERROR at line 1:
ORA-00971: missing SET keyword

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SQL & PL/SQL :: Update Statement With NEW LINE Character?

Feb 14, 2005

My Table "demo" has a column "Combined_attributes". I want to update this column with some value having a new line character in it.

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SQL & PL/SQL :: How To Use DECODE For A Column In Update Statement

Apr 9, 2010

I have to conditionally update a set of columns in a table. If the column status_code_stage_3 IS NULL THEN I have to update the column status_code_stage_2. The below query is giving error:-

Test Table create scripts
CREATE TABLE test11( date_stage_3 date, reason_code_stage_3 varchar2(20),
reason_code_stage_2 varchar2(20), opportunity_date date )
INSERT INTO test11 values(sysdate,'reason1',NULL,sysdate)
INSERT INTO test11 values(sysdate,NULL,'reason2',sysdate)

[code]....

how to work out the update statement to use the conditional statement for columns.

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SQL & PL/SQL :: Substr And Instr In Update Statement

Nov 28, 2010

I have a table1 with columns serial no and name as below

serial no name
1 john paul
2 john victor

and i have another table1 with columns serialno,firstname and second name as below

serial no firstname secondname
1
2

I want to update my table2 with the name from table1 and divide and insert in first name and second name as below

serialno firstname secondname
1 john paul
2 john victor

i use the query as below

update table2 set
firstname = (select substr(name, 1, instr(name, ' ', 1) - 1)
from table1
)

but the above query not worked.

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SQL & PL/SQL :: After Update Statement Sql%NotFound Is Being Validated?

Jun 29, 2012

After an Update statement, Sql%NotFound is being validated. Sql%NotFound validates to true even though a record matching the update condition is found. Because of this, the procedure execution Exits. If the Sql%NotFound is commented, then the Record gets updated. which is validating Sql%NotFound condition to True.

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Feb 7, 2013

I have two tables have almost the same columns, how can I use merge statement to update the target table only when there is difference between source and target table. Is there any easier way not compare each column one by one? I am using Oracle 11.2

Here is the MERGE statement:

Merge into tb_trgt trgt using tb_src src
on (src.id = trgt.id)
when not matched then insert (trgt.id, trgt.nm, trgt.addr) values (src.id, src.nm, src.nm)
when matched then update set trgt.nm = src.nm, trgt.addr = src.addr
where trgt.nm <> src.nm or trgt.addr <> src.addr
;

Is there any easier way to specify the where clause in the NOT MATCHED? I don't want compare each column of the tables. Since I may have many columns in the tables.

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Nov 16, 2012

I've seen this example numerous places, and tried to implement it, but I keep getting an "invalid identifier" error message, despite the fact that I've got the table and column specifically identified.For instance, my query reads like:

UPDATE tbl1
SET tbl1.EMPID =
(SELECT  tbl2.EMPIDA  FROM tbl2 
WHERE LOWER(tbl1.EMAILCOL) =  LOWER(tbl2.EMAILCOL2)
)
WHERE tbl2.EMPIDA IN ('Z1O435','S8M4722','M0D5156')
AND EXISTS
(SELECT tbl2.EMPIDA
FROM tbl2
WHERE  tbl1.EMAILCOL= tbl2.EMAILCOL2 );

But I'll keep getting flagged at the tbl2.EMPIDA column reference. I have not tried this in SQL Plus, just in TOAD, but it seems to repeatedly fail.I have had to dump records to standalone Access tables and link back to perform the updates.

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Apr 15, 2009

I am having trouble getting the following update statement to work.

update Team
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WHERE
Team.ROE_PROCESS = 'G' AND

[code]...

The error message I am receiving is:
ORA-00904: "Department"."UI_WKLY_EARNS": invalid identifier

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Oct 6, 2010

I am running one update statement which is running almost one hour still no response.

I would like to know either query is processing or hanging(suppose to finish the update within few minutes).

Is there any way or sql to find either the statement(my update query) is running or hanging.

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Mar 5, 2012

I would like to insert a value if that value is not existing in the table (example for a column which contains date only new dates should be inserted and if the date already exists in the column then it needs to get updated )

example of scenario...

date s1 s2 s3

in the above if the date is new..it should get inserted with the appropriate slot no.(s1,s2,s3) if the date already exists it needs to update the no.in slot no.

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