How To Subdivide 1 Large TABLE Based On The Output Of A VIEW?

Aug 15, 2012

I am searching for a decent method / example code to subdivide a large table (into a global temp table (GTT) for further processing) based on a list of numeric/alphanumeric which is the resultset from a view.

I am groping with the following strategy in PL/SQL:

1 -- set up cursor, execute the view (so I have the list of identifiers)

2 -- create a second cursor (or loop?) which: accepts each of the identifiers in turn executes a query (EXECUTE IMMEDIATE?) on the larger table INSERTs (or appends?) each resultset into the GTT

3 -- Then the GTT contains just the requires subset of the larger table for further processing and eventual import into iReport for reporting.

GTT is defined and ready to go, the larger table contains approx 40,000 rows and I need to extract a dozen subsets or so which add up to approx 1000 rows.

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SQL & PL/SQL :: Splitting Large Table Output

Sep 20, 2012

I need to dump the contents of a very large table into text files for archiving as we retire this old DB. The table has about 16 million rows, and a few of the columns are up to 4000 characters wide (varchar2(40000)). I've got 2 problems:

1) How can I select records that occur in a certain month of a year (there is a date column) and put the selected records into a file?

2) I don't have access to the server OS, so UTL_FILE is not possible. The output is also so large that I'm having trouble with the DBMS_OUTPUT.PUT_LINE.

I'm trying to get the first block of the IF working first, so the rest is just placeholders.

v_mm number (2);
v_yyyy number (4);
min_mm number (2);
min_yyyy number (4);
max_mm number (2);
max_yyyy number (4);
min_date date;

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How To Get Fast Output From Large Table

Jan 25, 2013

i have three tables and all of these tables have around 30L records.

Using join i am retrieving records from these tables but it is taking much more time to get output.

Partition can improve performance?

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Apr 26, 2010

I have a query on , how to view the sample data from a very table which is large in size ( more than 10 million ).

I just need to see some sample data from a large table ( to see what kind of data which is application related ).

My question is :

Select *
from Sample_table
where rownum < 10

is this a Good way to view the sample data ?

I have understanidng that the rownum will be assigined to the rows once all the rows are reteived.

So what is the best way to view ?..I am not sure of any condition to put in the intial time of querying.

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SQL & PL/SQL :: View With Column Based On Row Values Of Another Table

Apr 13, 2011

I have table with values :

Z0000221P114 45
Z0000135P115 68

For the column all possible values are ( P102,P101,P103 etc toP124). I want to create a view ( if possible ) from the above with data output as :

PROV_ID P101 P102 P103 ............................P124
z000234 23 45 60 72

basically this view has columns based on the previous tables column ( MEASURE_ID) values and the values will be corresponding value in column Percentage.

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Sql To Display Output In Horizontal View?

Sep 8, 2012

I need to display the sql query output in horizontal manner. Below I have given the script.

create table TestTable (id number, name varchar2(10))
insert into TestTable values (1, 'John')
insert into TestTable values (2, 'Mckensy')
insert into TestTable values (3, 'Valneech')
insert into TestTable values (4, 'Zeebra')


But for my requirement, I need to display in horizontal manner.

ID   1       2       3           4
Name John    Mckensy Valneech    Zeebra

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May 7, 2013

i have a form based on view just to display. when i execute query,records are getting displayed more than once. make them get displayed just once.

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Apr 1, 2009

I have a Materialized view based on 2 views. I modified one column in both the views.Do i need to refresh the Materialized view.

E.g. :

In view1 and view2 i changed column like this
nvl(,'n/a') testdata --changed
nvl(,'n/a') testdata --original


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PL/SQL :: Materialized View Based On Stored Procedure Data

Sep 23, 2013

is it possible to base a Materialized View on results returned from a stored procedure?If not, do you see any other way except of filling a table with data from the stored procedure and then basing the MV on it? 

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PL/SQL :: Create Reporting View Based On Date Column

Jul 30, 2012

My DBA gave me a table with only one date column say Table1.Date. Its in the format of Date and say it is = 7/23/2012.

Now i have to create my own Reporting View(which is used for reporting) based on that date column like below:

It should be a column with values in the following format =
2012-05 etc....upto

So i started out my creating like this:

from Table1


.and so on till i get 2010-01.

there has to be a better way to do this.

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SQL & PL/SQL :: Create Materialized View With Clob Column Based On Varchar2?

Feb 9, 2011

I need to create a materialized view with a clob column based on a varchar2 column of a table.This is because in the mv the clob column data gets appended one after another.

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Aug 12, 2013

I want to add column to table which has huge amount of data and fill with data from another table. What is the best way to do it? Is it faster to use CTAS instead of ALTER TABLE ADD COLUMN?

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May 13, 2011

How to estimate next extent size for very large table? What should I take into account? Is there any formula for that?

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SQL & PL/SQL :: How To Implement Pagination For Large Table Joins

Sep 2, 2011

I have two large tables(rptbody and rpthead) which has over millions or even more records. Below is the table schema

describe rpthead
Name Null Type
--------------------------- -------- -------------

What I want is getting all data if the referenced RPTNO belongs to a particular product_id from rptbody table, here's the sql


Since the result set is pretty large, so my application(think it as c couple of jobs, each job should be finished in a time window) can only process a subset of all data, so I need pagination so that the next job can continue the processing until all data is processed, below is the SQL with pagination

select * from (
select a.*, ROWNUM rnum from

As you can see each query will take 100 rows from the db. The problem for now is that the query taking too much of time(10+ mins), I know the slowness is due to "ORDER BY t0.LINENO", but it's required for pagination.

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SQL & PL/SQL :: Unable To Create Index On Large Table

Sep 30, 2012

I am trying to create a new index on large table of size around 100GB. but i am getting the following error:

ORA-1652: unable to extend temp segment by 128 in tablespace TEMP.

temp tablespace size is : 20 GB.

does it mean that the whole index will be created at temp tablspace first?

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PL/SQL :: Deleting Large Number Of Rows From Table

Apr 30, 2013

Consider tables A,B,C,D,E,F. all are having 100000++ records Tables B,C,D are dependent on table A (with foreign key constraint). When I am deleting records from all tables, table B,C,D are taking max 30-40 seconds while table A is taking 30-40 mins. All tables are having indexes.

Method I have used:

1. Created Temp table

2. then deleted all records from B,C,D,E,F for all records in temp table for limit of 500.
delete from B where exists (select 1 from temp where b.col1=temp.col1);

3. Why it is taking too much time for deleting records in table A.

Is there any thing that during deleting data from such master table, it is referring to all dependent tables even if dependent data is not present ?

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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..



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Server Utilities :: Export Dump Of Large Table

Apr 9, 2010

We have two databases running on and Both are having the same unpartitioned table of size 80G. I am exporting the table on 10g by using parallel=8 and dumpfile with %U option. That took around 4 hours to export the table.

And on, i am exporting using below parameters, taking around 5 hours.


options i can try to speed up the export in both versions.

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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 );


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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Use Range-hash Partitioning Of A Large Dimension Table

Apr 12, 2013

At moment we use range-hash partitioning of a large dimension table (dimension model warehouse) table with 2 levels - range partitioned on columns only available at bottom level of hierarchy - date and issue_id.

Result is a partition with null value - assume would get a null partition in large fact table if was partitioned with reference to the large dimension.Large fact table similarly partitioned date range-hash local bitmap indexes

Suggested to use would get automatic partition-wise joins if used reference partitioningWould have thought would get that with range-hash on both dimension.

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RAC & Failsafe :: Inserting Large Data Locks The Destination Table In RAC

Oct 18, 2010


Our application is using a two instance, one for the live active data and the other for the reports data. We have a process which moves the data from the live instance to reports instance every night. In a single db environment the process is working without any issues. However when we move to the RAC environment the reports db's (insert) in large table get locked and we are unable to insert data to the reports db.

What we are performing is:

Insert into my_table_rpt select * from may_table_live@db_link_to_livedb;


my_table_rpt get locked

We have found the workaround by disable locking in destination and subsequent to the insert enable locking


Insert the data to the reports database table




Why does the large destination table (my_table_rpt) get locked in the RAC environment?

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Performance Tuning :: Split Large Table To Small Pieces?

Mar 28, 2011

I have several large tables in the live system! Those table are store historical information.

current situation:

Now, A table record was 129 million rows.

Every month added 4.5M records to this table.

This table data size 17GB and index size 28GB.

I have only 30 GB available free space on disk!

How to split this table to small pieces (partition table by month)?

What is the best approach?

I would like to do partitioning on this table month by month.

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SQL & PL/SQL :: Materialized View - Table Or View Does Not Exist

May 2, 2012

I have a materialized view "pro_mview",I am trying to refresh the MVIEW by using the following statement.


But I am getting the below error.

Error at line 1:
ORA-12008: error in materialized view refresh path
ORA-00942: table or view does not exist
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2256
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2462
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2431
ORA-06512: at line 1

I am able to fetch the data from that materialized view(pro_mview).

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Data Archive Script Is Taking Too Long To Delete A Large Table

Aug 8, 2013

We have data archive scripts, these scripts move data for a date range to a different table. so the script has two parts first copy data from original table to archive table; and second delete copied rows from the original table. The first part is executing very fast but the deletion is taking too long i.e. around 2-3 hours. The customer analysed the delete query and are saying the script is not using index and is going into full table scan. but the predicate itself is the primary key,More info below



 Data is first moved to table in schema3.OTW. and then we are deleting all the rows in otw from original table. below is the explain plan for delete  

SQL> explain plan for  2  delete from schema1.mon_txns where id_txn in (select id_txn from schema3.OTW); 

Explained. SQL> select * from table(dbms_xplan.display); 


Plan hash value: 2798378986
| Id  | Operation              | Name       | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------------|   0 | DELETE STATEMENT       |            |  2520 |   233K|    87   (2)| 00:00:02 ||   1 |  DELETE                | MON_TXNS   |       |       |            |          ||*  2 |   HASH JOIN RIGHT SEMI |            |  2520 |   233K|    87   (2)| 00:00:02 ||   3 |    INDEX FAST FULL SCAN| OTW_ID_TXN |  2520 | 15120 |     3   (0)| 00:00:01 ||   4 |    TABLE ACCESS FULL   | MON_TXNS   | 14260 |  1239K|    83   (0)| 00:00:02 |

Predicate Information (identified by operation id):

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Oct 8, 2013

I have a report with single row having large number of columns . I have to use a scroll bar to see all the columns. Is it possible to design report in below format(half columns on one side of page, half on other side ofpage : 

Column1DataColumn11DataColumn2DataColumn12DataColumn3DataColumn13DataColumn4DataColumn14DataColumn5DataColumn15DataColumn6DataColumn16DataColumn7DataColumn17DataColumn8DataColumn18DataColumn9DataColumn19DataColumn10DataColumn20Data I am using Apex 4.2.3 version on oracle 11g xe.

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Performance Tuning :: How Expensive (speed) Is Unique Versus Primary Key In Large Table

Aug 15, 2011

I have two design alternatives and need to understand how expensive (speed) is one of them against the other for a medium size table (100K-200K records):

create table xyz
f1 number not null,
f2 varchar2(20) not null,
f3 number not null,
f4 varchar2(50),


the idea is to optimize the design by using a PK instead of the 3 keys and there is a debate that searching a unique index field(2nd scenario) is of the same speed than searching a PK field (1st scenario).

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Jun 7, 2013

I am working on a simple form which will get the user to fetch required columns of employee master.

For that i have created a form which will display the column names and select option. When user clicks on query, the form will display the selected columns in a block. After going thru if required the user can download it to excel.

As of now I do not have filtering option. For this I thought of creating view based on the selection and then fetch records from the view and display it in form.

To achieve this I would like to know How I create or replace a view dynamically based on values selected. I remember doing this sort of thing long back, but could not recollect it.

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SQL & PL/SQL :: Load 10 Million Rows In Table From Another Table Based On Multiple Joins

Sep 24, 2010

We have to load 10 million rows in a table from another table based on the multiple joins. How much tablespace size we allocate to the table and for performance point of view how much should be the SGA size.

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Jul 30, 2012

I stumbled about some weird 11gR2 behavior (running on AIX).When I performed a join between a table with user based content (parts belonging to an sourcing scope) and a base table (parts available) whereas the parts have to fulfill a special regular expression, it showed that the same query is faster when using outer join than inner join (about 0.7sec vs. 20sec; which makes me believe that regexp_like works wrong when involved in an inner join).

i tried the same statement with a standard like (but not fulfilling the same condition).This time performance was as expected (inner join outperforming outer join).

Oracle version information
Oracle Database 11g Enterprise Edition Release - 64bit Production
PL/SQL Release - Production
CORE     Production
TNS for IBM/AIX RISC System/6000: Version - Production
NLSRTL Version - Production

I can see it, the execution plan for the "inner join" doesn't show so much more costs than the one for the outer (but why at all is does an inner join cost more?) ...The execution plan for both "not like" is the same and (surprisingly ;-) ) similar to "outer-regexp".

I hope sample data are not needed as there would be needed a lot...this is the second time I came across the "plan worse but execution time better" phenomenon.

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SQL & PL/SQL :: To Get Output From Table - Possible To Combine A Row?

Mar 6, 2012

To get output from a below mentioned table? can we combine a row like that?

Table: Test_Fruits

------- -------- ------- --------
4 Apple
3 Potato
Expecting output:
Pls guid me how to get like this?
------- -------- ------- --------
1Fruit 4 Apple
2Vegitable 3 Potato

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