SELECT T1.COL1,T1.COL2,
T1.COL3,T2.COL2,
T3.COL1,T3.COL2,
T4.COL1,T4.COL3,
<CASE statements and calculations results - Some Amount1>,
<CASE statements and calculations results - Some Amount2>
[code]..........
First I need to display all the records from TAB_ONE which contains more than 10million records. If you see there are columns like AMOUNT_ONE,AMOUNT_TWO which has got some complex calculations and that is based on some other calculations and which in turn and goes on.... Like this I have some ten amount columns. Finally these records has to be inserted into a new table.
To get this I have written nested inline queries to calculate these AMOUNT columns but since considering the huge amount of records, it takes more than 8 hours for inserting this into a new table.
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,
When we use the AUTOTRACE / EXPLAIN PLAN we can see the (estimated) best execution plan the Optimizer found for our SQL Command. Is there a way to display all alternate execution plans the Optimizer has considered ?
A website requires to display consolidated data from databases located in different geographical regions (India, London and New York). The application server for the website is hosted only in one location India. What are the techniques that can be used for faster retrieval of data from all 3 databases?
Note: There is no need of real time data retrieval from different regions; however the user should able to view the updated data at predefined intervals.
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
There is a table in Database with millions of records and a query --- Select rowid, ANI, DNIS, message from tbl_sms_talkies where rownum<=:"SYS_B_0" ---- using the high CPU and also this query having high number of executions.
Ways for improving the Table performance which holds million of records for oracle. Currently we have partitioning and indexing but it doesn't seem to work.
I have a question regrading how oracle fetches record in case of partitioning...
we have a table of nearly 6 crores of records.. that table has several columns among which the DBA has given the range partition on COL1 and hash subpartition on COL2...
CREATE TABLE ORDER_BOOK (CUST_ID NUMBER(10), ORDER_DATE DATE, ..........., ..........., ...........) PARTITION BY RANGE (CUST_ID) SUBPARTITION BY HASH (ORDER_DATE) [code]........
I want to know how the rows will get organised in the tablespaces...the DBA didn't mention any tablespace name in the main partition and he has mentioned the tablespace names only in the subpartition template. so how the records will get organised.
I have created below function to remove specific words/special characters from string. This function is producing expected result. Using this function i need to insert around 900000 records in name_compress table. Insert is taking around 7 mins, how we can tune this function so that insert will be executed within 1-2 mins.
Function -
CREATE OR REPLACE FUNCTION NAME_FN(IN_STRING1 VARCHAR2) RETURN VARCHAR2 IS V_OUTPUT VARCHAR2(300); V_OUTPUT1 VARCHAR2(300); V_OUTPUT2 VARCHAR2(300); V_OUTPUT3 VARCHAR2(300);
Looking to understand the difference between instance tuning and database tuning.
What is the difference between these two tuning exercises? I understand that an instance is memory based structures (logical) where as database consists of physical structures.
However, how does one tune a database the physical structure? Does it have to do with file placements/block sizes etc. Would you agree that a lot of that is taken care by ASM now in 11g? What tools are required/available (third party as well as oracle supplied) for these types of tuning scenarios?
How the length of column width effects index performance?
For example if i had IOT table emp_iot with columns: (id number, job varchar2(20), time date, plan number)
Table key consist of(id, job, time)
Column JOB has fixed list of distinct values ('ANALYST', 'NIGHT_WORKED', etc...).
What performance increase i could expect if in column "job" i would store not names but concrete numbers identifying job names. For e.g. i would store "1" instead 'ANALYST' and "2" instead 'NIGHT_WORKED'.
I have a question about database fragmentation.I know that fragmentation can reduce performance in query times. The blocks are distributed in many extents and scans process takes a long time. Oracle engine have to locate the address of the next extent..
I want to know if there is any system view in which you can check if your table or index has high fragmentation. If it's needed I will have to re-create, move or rebulid the table or index, but before I want to know if the degree of fragmentation is high.
Any useful script or query to do this, any interesting oracle system view?
There is a simple way to increase the performance of a query by reducing the row-size of the table it hits. I used it in the past by dividing the table into smaller parts and querying respective smaller table in each query.
what is this method called ? just forgot the method and can't recall it. what this type of row-reduction optimization is called ?
How many records could I have in a single table without performance degradation with Standard Edition without partitioning with cutting-edge server (8 or 12 cores, 72 GB RAM, FC 4 Gbit, etc...) and good storage?
300 Millions in only one table with 500K transactions / day is too much?
Testing our 9i to 11g upgrade, we've imported the entire DB into the new machine.We've found that certain procedures are really suffering performance problems. BUT, we've also found, that if we check out a production copy of the procedure from our source code control, and reinstall it, the performance issue goes away. Just alter the procedure and recompiling does NOT work.
The new machine where the 11g database exists is slightly different than the source, but it's not like we have this problem with every procedure. It's only a couple.
any possible reason that we'd have to re-install a procedure to correct a performance problem?
I need to check the package performance and need to improve the package performance.
1. how to check the package performance(each and every statement in the package)? 2. In the package using the delete statement to delete all records and observed that delete is taking long time to delete all the records in the table(Table records 7000000). This table is like staging table.Daily need to clean the data before inserting the data into it. what can I use instead of Delete.
Somewhere I read that we should not use hints in Oracle production environments, but we can use hints in the development environment and on achieving the desired execution plan we can adjust the 'statistics' to follow that plan without hints.
Q1. If it is true what statistics do we adjust for influencing the execution plan and how?
For example, I have the following simple query:
select e.empid, e.ename, d.dname from emp e, dept d where e.deptno=d.deptno;
emp.empid, emp.deptno and dep.deptno columns have indexes and the tables have the standard structure as found in the basic oracle examples.
If I look at the execution plan of the above query then I see that the driving table is empand the driven table is dept.Also the type of join that is taking place is 'Nested Loop'.
Questions: With respect to the above query, Q 2. If I want to make dept the driving table and emp the driven table then how can I adjust the statistics to achieve that? Q 3. If I want to use hash join instead of a nested loop join then then how can I adjust the statistics to achieve that?
I can put the ordered and the use_hash hint to effect this but again I have heard that altering statistics is a more robust way to control an execution plan as compared to hints.
When i exporting an user using expdp utility, the load the on the server is going up-to 5. The size of the database is 180GB. Below is the command that i use for export.
The following query gets input parameter from the Front End application, which User queries to get Reports.There are many drop down boxes like LOB, FAMILY, BRAND etc., The user may or may not select values from drop down boxes.
If the user select any one or more values ( against each drop down box) it has to fetch all matching values from DB. If the user does'nt select any values it has to fetch all the records, in this case application will send a value 'DEFAULT' (which is not a value in DB ) so that the DB will fetch all the records.
For getting this I wrote a query like below using DECODE, which colleague suggested that will hamper performance.From the below query all the variables V_ are defined in procedure which gets the values selected by user as a comma separated string here V_SELLOB and LOB_DESC is column in DB.
DECODE (V_SELLOB, 'DEFAULT', V_SELLOB, LOB_DESC) IN OPEN v_refcursor FOR SELECT /*+ FULL(a) PARALLEL(a, 5) */ * FROM items a WHERE a.sku_status = 'A'
what the principal things to look at when we have for the same query different performance results are?I have 2 different bases: the plan and data are the same but performance results are very differents.
how to display all the records in a table ,i am passing the table name as in param to the procedure/function suppose if i pass emp table name it will display 14 rec, if i pass dept it will display 4 records.
I want to display all records from table 1 (even the null values) that do not match records in Table 2. Below I am creating both tables and I am posting the result query I need.
------------------------------------ CREATE TABLE temp_table1 ( name VARCHAR2(12 BYTE), last_name VARCHAR2(12 BYTE), STATE VARCHAR2(2 BYTE), BIRTH_DATE DATE );
CREATE TABLE temp_table2 ( name VARCHAR2(12 BYTE), last_name VARCHAR2(12 BYTE), STATE VARCHAR2(2 BYTE), BIRTH_DATE DATE );
[code].....
The result query need to have 5 rows as shown below
NAME LAST_NAME STATE BIRTH_DATE ------------ ------------ ----- --------------------- john smith MA 12/1/1979 null null AZ null null null CT null null null MA null null null CT null
i want to display all the records of my database in a table with scrollingexample if i have 3records in my DB so a table must have 3records too !!!this is my code :
DECLARE Cursor cur IS SELECT numb_ph AS phone, name_emp AS name
[code]...
but the problem 's all records of my DB are display in one record (to view another record i use the scrolling ..
how to display the data which is shown below without duplicate records in compid and compname and all policy_id's should be there while excuting this query iam getting this data.
select distinct comp_id as compid, comp_disp_name as company, plcy_id as policyid,
19734 Save the Children 9013 GPA 19734 Save the Children 9012 GMC 20097 JMT 9486 GTL 10890 Steelco Gujarat Ltd. 9727 CAR 17330 Golden Jubilee Hotels Limited 8915 CGL 23117 NBHC 9093 GMC 17542 Heinz India 10693 Fire 19821 KSK Fabricators 10341 D&O 3769 Jones Lang Lasalle India 9199 WC 19821 KSK Fabricators 10340 WC
The select statement retrieves records well when executed at SQL promt.
But the same records are not displayed in this procedure by fetch from cursor.
The last message in the procedure 'completed' is also displayed.
create or replace procedure disp_rec(vid IN varchar2, vfeat IN number) is cursor c1 is select gid, listagg(vindex, ',') within group (order by tid) idx from ridrecords where idarpt=vid and feattype=vfeat group by gid; type vg is table of number; type vi is table of varchar2(3500);
are the most important performance keys we have to calculate or take in account to preserve or to increase the DB performance in terms of response times, and whatsoever according to performance ?
i hav the following records i need to display the records of financial year wise (i.e april year-1 to mar year) here there are no records for months 9,10(september and october)
what i want is 0 to be displayed over there in the below table
s.no key id yyyymm ce1 ce2 ce3 t ihu pf mi pwd F 920110600000156431372010043424541500065457709539XXXXXXXXXXU 10201106000001565313720100534245415000009539XXXXXXXXXXU 11201106000001566313720100634245415000009539XXXXXXXXXXU 12201106000001567313720100738555415000009539XXXXXXXXXXU 13201106000001568313720100836445415000009539XXXXXXXXXXU 1420110600000157131372010110000009539XXXXXXXXXXU 15201106000001572313720101276881082200001888009539XXXXXXXXXXU 1620110600000157331372011010000009539XXXXXXXXXXU
