Max No. of records in a table - performance related statistics of a table

Hi all,
Can anybody please help me on the performance related statistics depending upon the size of the table?
I have a question regarding the scalability and(I think so) and performance.
My record is having 20 columns and all columns together it will come upto around 200 bytes/record.
What is the maximum no of records that can be stored in a table?
Currently the table is having more than 500,000 records.
Every month, 15,000 new records are added. A new requirement came up now. If that is implemented, no. of records per month will go upto 50,000.
It means the table is getting filled up at more than three times faster every month.
How this will effect my application's performance - Querying / Inserts / Updates ?
Please help me.
thanks and regards.
Pandu

There is no inherent limit to the number of rows in a table, I have several tables with over 20 million rows (and many of these are over 200 bytes per record).
The performance impact of larger tables largely depends on how you access the tables. The size of the table will not really affect Inserts. Updates and Selects will become slower as the table increases, however, the magnitude of the impact will depend on how you access the tables. If most queries/updates go after single rows using a PK, then the impact will be minimal. If most queries/updates affect large numbers of rows using unindexed columns as selection criteria, then the impact is potentially huge.
Depending on the nature of the data, and the way it is used, you may want to investigate partioning as a way of limiting the number of rows that need to be searched for any given query/update. Even with 500,000 rows currently and 50,000 a month coming in, you probably have several months to look at it before anything drastic needs to be done.
Just make sure that you analyze the fast changing tables frequently.
HTH
John

Similar Messages

Max No. of Records in a Table

Dear Sir/Madam,
I have the Transaction table with 10 Million records. While Tuning the table it takes 5.8 seconds to fetch records from it with Cost based optimization. I have Partitioned my table based on months and necessary index is been created.What should I want to do to reduce this time.
Is there is any way to get the Time duration (like. Estimated Time - 5.8 seconds) taken by a Query in SQL prompt itself.
With Regards,
Velu N

Hi Velu,
I'm not sure if this is the approriate forum for this type of question... or is this related to Warehouse Builder?
Jean-Pierre

Max no of records in for all entries table

Hello all,
Hi have used for all entries in a select statement in BW extractor. This extractor is working fine for the test data. When i moved this code to pre-production for testing, there this extractor has to deal with thousands of records. In pre-prod , this select statement is not picking up all the records available in DB. Can any one give any idea on behavior of for all entries for large number of records. and is the any max limit for for all entries table.
Thank you..correct answer will be rewarded.
Regards
Sravan

Moderator message - Please search before asking and do not offer rewards (particularly since as far as I can see, you've awarded a total of two points in the last two years - post locked
Rob

Max number of records in an internal table

Hi,
Can any one tell me what is the Max Number of records we can get into an internal table.
if you have any link of sap help on this please FWD.
thanks in Adv.
Regards,
Lakshmikanth.T.V

Hi lakshmikanth,
Internal Tables as Dynamic Data Objects
Internal tables are always completely specified regarding row type, key and access type. However, the number of lines is not fixed. Thus internal tables are dynamic data objects, since they can contain any number of lines of a particular type. The only restriction on the number of lines an internal table may contain are the limits of your system installation. The maximum memory that can be occupied by an internal table (including its internal administration) is 2 gigabytes. A more realistic figure is up to 500 megabytes. An additional restriction for hashed tables is that they may not contain more than 2 million entries. The line types of internal tables can be any ABAP data types - elementary, structured, or internal tables. The individual lines of an internal table are called table lines or table entries. Each component of a structured line is called a column in the internal table.
regards,
keerthi.

Max. records in Range table used in Select .. IN ?

Hi
Does somebody knows wich is the max. amount of records in a RANGES table used in Select Comand:
select xxxx FROM table
where field IN range_table.
That, because i found severeal times programs aborting for this cause, so i changed this condition to an ALL ENTRIES.
Regards
Frank

It really depends on the table and DB settings.
Check with your DBA folks.
On our system it's ~ 400-500 for most of the tables.
NOTE: as it depends on DB settings - it may be different on your development system and on your production system.
For all entries does ntohave this limitation as it's being split into several selects, you can see it in the trace.

Performance issue - insert records from db2 tables

I have a table say emp in oracle database and i have the emp table in db2 database. My job is to pull all the records (million records) from db2 table to oracle emp table. My insert statement is like below. I am connecting to the db2 database using dblink.
insert into emp
select * from emp_db2, dept_db2
where emp_db2.dno = dept_db2.dno
and dept_db2.dno = 10;
The statement is still running. How to improve the performance ?
please suggest.
thanks,
Vinodh

Vinodh2 wrote:
1.how much is your select query is taking? 1 day over . still running.
2.What is the row count from the query? 85632978 records
3.Whats your expected completion time? 30 minutes
I am not getting the explain plan because the query is still running.
do as below
SQL> set autotrace traceonly explain
SQL> select sysdate from dual;
Execution Plan
Plan hash value: 1388734953
| Id | Operation      | Name | Rows     | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT |     |     1 |     2   (0)| 00:00:01 |
|   1 | FAST DUAL      |     |     1 |     2   (0)| 00:00:01 |
-----------------------------------------------------------------

Find the latest updated or the latest inserted record in a table

Hi All,
Thanks in advance
Just a simple question
How do we find the latest updated or the latest inserted record in a table ?
Provide some queries in SQL?

You can order by rowid desc to get lately inserted records, but I'm not sure about updated records.That is incorrect, Oracle might use old rowid's even in inserts and you cannot assure that the max(rowid) refers to the latest record.
If the table is created with rowdependencies one can use ORA_ROWSCN pseudo column to check on date/time when the last dml has been performed over that table. But, that has some limitations too, Old snapshots will be erased hence one can check the last dml with a time frame of few days.
Regards,
Prazy

Fetch last record from database table

hi,
how to fetch last record from database table.
plz reply earliest.
Regards,
Jyotsna
Moderator message - Please search before asking - post locked
Edited by: Rob Burbank on Dec 11, 2009 9:44 AM

abhi,
just imagine the table to be BSEG or FAGLFLEXA... then what would be performance of the code ?
any ways,
jyotsna, first check if you have a pattern to follow like if the primary key field have a increasing number range or it would be great if you find a date field which stores the inserted date or some thing..
you can select max or that field or order by descending using select single.
or get all data.. sort in descending order.(again you need some criteria like date).
read the first entry. using read itab index 1

How to get large no of records from adf table

Hi All,
I'm working on adf.I'm using jdeveloper 11.1.1.5 version.In my adf application i have 1000 records in my adf table.I want to get the 500 selected records from that table at a time.But im not able to get huge number of records.How can i get the records from adf table.Please give me ur valuable suggestions.
Thanks!

Hi.
for large record check the oficial doc.
http://docs.oracle.com/cd/E24382_01/web.1112/e16182/bcadvvo.htm#CEGDBJEJ
PAGE_RANGING is the best option for large tables.
and these maybe will help you
Re: Performance scrolling large ADF tables
Re: Expert opinion needed: Best practices to handle huge rowsets on UI

How to Restore deleted records in other table in oracle database 10g...

Hi All,
i want to restore deleted records of a particular table in other table
suppose:
i perform a query
delete from emp
where deptno =30;
now i wont to restore deptno=30 records in other table, let say in emp1 table
can any one let me know how to do it?
Thanks..

This is what flashback query is for:
orclz> conn scott/tiger
Connected.
orclz> select count(*) from emp;
COUNT(*)
14
orclz> delete from emp where deptno=30;
6 rows deleted.
orclz> commit;
Commit complete.
orclz> create table deleted30 as select * from emp as of timestamp(systimestamp - 5/1440) where deptno=30;
Table created.
orclz> select count(*) from deleted30;
COUNT(*)
6
orclz>

Regarding how to delete the record in internal table

Hi experts ,
how to delete the record in intarnal table after validating the data,
if record contains invalid fields?
i am giving my code see this and give me the answer?
loop at it_data into wa_data .
Validate Cost Center
    READ TABLE it_kostl INTO wa_kostl WITH KEY kostl = wa_data-kostl BINARY SEARCH.
    IF sy-subrc NE 0.
      PERFORM update_error_log USING wa_data
                                     text-004.
    ENDIF.
Validate source file material ( material number )
loop at it_mara into wa_mara .
read table it_ausp into wa_ausp with key atwrt = wa_data-i_matnr .
           if sy-subrc NE 0 .
   PERFORM update_error_log USING wa_data
                                       text-002.
delete it_data-objek .
     else.
read table it_mara into wa_mara with key matnr = wa_ausp-objek .
       if sy-subrc EQ 0 .
       wa_data-objek = wa_mara-matnr.
       wa_data-matkl = wa_mara-matkl.
     ENDIF.
     Modify it_data from wa_data .
endif.
*endloop.
Validate unit of measure (unit)
    READ TABLE it_t006 INTO wa_t006 WITH KEY msehi = wa_data-unit .
    IF sy-subrc NE 0.
      PERFORM update_error_log USING wa_data
                                     text-003.
    endif.
Validate delivery location ( storage location )
    READ TABLE it_lgort INTO wa_lgort WITH KEY del_loc = wa_data-del_loc.
    IF sy-subrc NE 0.
      PERFORM update_error_log USING wa_data
                                     text-001.
         if wa_data-flag ='x' .
      delete it_data from wa_data .
    endif.
    ENDIF.
endloop.

Hi Naren,
First get the index number of the IT_data table and store it in one variable whose declaration like this.
data: tabix type sy-tabix.
while reading the internal table it_data set the tabix variable.
tabix = sy-tabix.
Instead of the above use below one.
Delete it_data-objek
Use the Below statement it will delete the row from the internal table.
Delete it_data-objek index tabix
Thanks,
Chidanand

How to find the longest record in a table?

Hello,
Is there a function to find the longest record in a table? Or is there a data dictionary that would tell you which record contains the longest data?
I have a table with five columns and one million records. I want to find the record (5 columns combined) with the longest data. Thank you.

Dear watson2000!
The function "VSIZE" tells you the number of bytes in the internal representation of a column which means the size of a value within a column. An example of vsize can be found here:
[http://www.adp-gmbh.ch/ora/sql/vsize.html]
So I think you should try it with this query to get the size of the longest record:
SELECT MAX(VSIZE(column1)) +
       MAX(VSIZE(column2)) +
       MAX(VSIZE(column3)) +
       MAX(VSIZE(column4)) +
       MAX(VSIZE(column5)) AS "Maximum Row"
FROM your_table;To identify the longest record try like this:
SELECT rowid
FROM   your_table
GROUP BY rowid
HAVING (MAX(VSIZE(column1)) +
         MAX(VSIZE(column2)) +
         MAX(VSIZE(column3)) +
         MAX(VSIZE(column4)) +
         MAX(VSIZE(column5))) = (SELECT MAX(VSIZE(column1)) +
                                      MAX(VSIZE(column2)) +
                                      MAX(VSIZE(column3)) +
                                      MAX(VSIZE(column4)) +
                                      MAX(VSIZE(column5))
                               FROM your_table;)I hope that these two queries could be of help to you.
yours sincerely
Florian W.
Edited by: Florian W. on 23.04.2009 20:53

How to update Records of SAP table from .CSV file

Hi,
I have written a code which takes a data from (,) delimited CSV file and adds it into the Internal table.
Now I want to update the all fields in SAP table with the Internal table.
I want to use Update statement.
Update <table Name> SET <field needs to update> WHERE connditon.
I don't want to iterate through thousand on record in sap table to check the where condition.
Could you please tell me how to do it.

Hi. I thing you will not workaround the iterating of the internal table.
You can pre-load all the records into another internal table
check lt_csv[] is not initial. " important, otherwise next select would read all records of the table
select .... into lt_dbitab for all entries in lt_csv where key-fieds = lt_csv-key_fields...
check sy-subrc eq 0 and lt_dbitab[] is not initial.
then do in-memory update of the it_dbitab
loop at it_dbitab assign <fs>.
read table lt_csv assign <fs_csv> with key ... " lt_csv should be sorted table with key, or you should try to use binary search
if sy-subrc eq 0.
...change required lt_dbitab fields: <fs>-comp = <fs_csv>-comp...
endif.
endloop.
ant then you can do mass-update
update dbtab from table lt_dbitab.
From performance view, this solution should be much faster than iterating lt_csv directly and updating every single database record
Br
Bohuslav

Simple Query Question - How do I return the Last 3 records of a Table?

Question.
For example, I have a table that has 50 records.
How do I, specify in SQL to only return the last 3 records of the table.
Select a.* from table a where ????

I was just trying to show an example to a friend on
how something like this would work and if it was even possible. But it won't work. Here's a simple example:
SQL> create table emp
2 (id)
3 as
4 select object_id
5 from   all_objects
6 order by object_id;
Table created.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
     40830      55891
     40831      55892
     40832      55893So far, so good. These are the "last 3" rows inserted. Now delete a bunch of rows and insert 3 new ones:
SQL> delete emp where id < 40000;
33423 rows deleted.
SQL> commit;
Commit complete.
SQL> insert into emp values (60000);
1 row created.
SQL> insert into emp values (60001);
1 row created.
SQL> insert into emp values (60002);
1 row created.
SQL> commit;
Commit complete.
SQL> select *
2 from (select rownum rn
3               ,b.*
4         from   emp b)
5 where rn > ( select (max(rownum) - 3)
6                from    emp)
7 ;
        RN         ID
      7410      55891
      7411      55892
      7412      55893Here's the problem. Even though the "last 3 rows" are 60000 - 60002, I still get the same ones as the first query.

Need assistance searching records from multiple tables - Please Help!

Hi, I've been trying to solve this problem for several weeks now, and I have exhausted all of my knowledge and experience. I need help, and I hope someone here can give me some direction.
I am using VB 2008, and the CR that comes bundled with VS 2008 Pro. My database is a SQL Server 2005 CE v3.5 (a *.sdf file). I am connecting to the database through a dataset, and I am displaying the report in a CrystalReportViewer.
My dataset consistes of two tables:
1) tblCustomers which has a primary key "CustID", and contains only customer contact and personal information.
2) tblDateVisited which has a primary key of "VisitID", but it also has a column titled "CustID". Basically, every time a customer visits the business, details of that visit are recorded in tblDateVisited, and that record is associated with the customer by their CustID.
Here's what I'm trying to accomplish: I want to be able to display only Customer records when the customer has visited and that visit matches certain criteria. Right now, I am trying to match visits from the "tblVisitDate.PlayerType" column. If the customer has ever had a visit where they matched a particular player type, I want to see those customer records.
I don't know what I'm doing wrong, though. I can search a dataset if I am only querying one table and pulling records from that table. However, whenever I try to add a second table and perform queries on that table to get records from the first table, I can't return any records.
If it helps, I am trying to use one CrystalReportViewer to display multiple reports (user choice) and here's how I'm loading the report into the viewer:
Me.tblCustomersTableAdapter.Fill(Me.dsPlayerTypeReports.tblCustomers)
Me.tblDateVisitedTableAdapter.Fill(Me.dsPlayerTypeReports.tblDateVisited)
Me.ReportFile.SetDataSource(dsPlayerTypeReports.Tables(1))
I am suspicious that my problem is in the Tables(1) method. It confuses me that I can only assign one table as a datasource when I obviously need access to two tables to make this selection work.
Whatever the case, I'm at the end of my rope with this one. I'm not prone to giving up, but I'm at a dead end currently.
Any attempt to assist me with this will be greatly appreciated, successful or not.
Thanks in advance!
-Will

No, I am connected via ADO.NET. I don't think SQL CE can connect through ODBC (or if it can, I haven't been able to figure out how, yet). So this isn't a stored procedure.
When I examine the link, I can only choose an Inner Join or a Left Outer Join. Right Outer and Full Outer are not available. Could this be a problem with the dataset I'm using?
Could you explain what you mean by display all of the records and then choose the selection criteria?

Max No. of records in a table - performance related statistics of a table

Similar Messages

Maybe you are looking for