One of my clients need to remove three(of four) CPU to comply the licensing agreement with Oracle.
To avoid problems and also to list the possible problems that removing the CPU can bring, I wish to make a survey of the possible impacts, especially in performance, that removal can cause.
How can I get this information?
I have a complex expression coming as an input and I have to break that into smaller one to evaluate each of them. Explained in example:
Let's assume, I have an input string as "(({A}&{B})||({C}||{D})&({E}||({F}&{G})))". My requirement is to break into logical smaller groups like
1. ({F}&{G})
2. ({E}||({F}&{G}))
3. ({C}||{D})
4. (({A}&{B})
I have a user interface where the user can enter a formula using a set of parameters and operators. For eg , the user is given a list of parameters, say : Width, Height , Gauge. The list of operators include standard math functions : + - / * ^
He can select and create a formula like gauge * width. This is stored in a table. At a later time a job is scheduled to evaluate the formula based on parameters for width, gauge and height.
I can evaluate the expression by substituting each parameter.
I can do this using dynamic sql. However I'm not sure how to evaluate the ^ symbol. The equivalent of this is power function.
So if a user enters (height * 2) + (width^2) . How do i evaluate this. I am doing this in pl/sql.
I want to take a schema level export .The schema size is 115 GB size . Do we require same amount of space to be available in server side (where we are taking a dump) as the schema size or less or more space is required in server side ?
View 6 Replies View RelatedI need to recreate my table in order to change the column order. When I use the SQL Commands window and run the SQL, it runs successfully, creates the new table, but doesn't reorder the columns. Is this expected behavior?
View 2 Replies View RelatedOK, Now that the syntax has been corrected with "Chanchal Wankhade" I have an entirely new issue. I am sure this issue has to do with my case statement logic. I am getting multiple rows, when I am only looking for one. Here is my code:
SELECT
CASE
WHEN EP.PHYSICAL_DATE IS NULL
THEN
CASE
WHEN EC.ORIGINAL_CONTRACT_START < ((SYSDATE) - 365)
THEN 'NEEDS PHYSICAL'
[code].....
However, only one of these rows should be the output, which is "No". How do you get a nested case statement to evaluate to one result, instead of multiple? I'm quite sure it is in the logic. To spell it out, this is what I am trying to accomplish with the above code: If the "EP.PHYSICAL_DATE" is null, then use these sets of formula's to evaluate the output, BUT if the "EP.PHYSICAL_DATE" is not null, then use these set's of formula's to evaluate the output.
As it stands now, it appears as if my nested case statement is doing exactly what I told it to do, which is to evaluate both conditions, and output both.
I'm trying to find some information on the performance impact of a trigger on a heavily updated table when the condition to fire the update trigger is NOT met. In other words I guess what I'm really trying to find out is what the performance impact of the system checking the condition on the trigger to determine if it should fire or not is.
For example I have a batch job that inserts and updates a table heavily, but the batch job almost never updates the column in question on the trigger to the value that would cause it to fire, but it does update that column to other values often.
I know about the many downsides of using triggers in general, but I'm working with a third party application, so more optimal solutions aren't an option.
in my oracle enterprise manager under " user i/o " .i am having basically four category:
if we rank them out of ten it would be like :
read by other session 2/10
db file scattered read 1/10
direct path read .5/10
db file sequential read 6.5/10
and all these are comming for 2 tables involved for almost all time .some way to handle "read by other session" and " db file sequential read " .
i am rebuilding indexes of these involved table once in 10days and statistics for the these tables are collected every day using "analyze table "xxx" compute statistics."tell me the indepth approach i should take to minimize the impact as users are complaing for performance.
We have a change in IT Dept in our organisation and we have been asked us about the impact of the following changes
1. Change in listener Port
2. Change in value of send and Recieve buffer in listener.ora
3. Change in Archive Size from 40M to 20M
I am attempting to read from the maillog of our server, but I wish to make as few changes as possible for fear of blocking other systems access to the file.
I was initially going to call create directory maillogs as '/var/log/maillog' and then drop directory maillogs; when I was done but I found my user does not have "create any directory" permissions.
Rather than compromise security of the existing database configuration, I thought I would permanently add the maillogs to the list of available data directories. Are there any implications to the filesystem if I do this, or should I be able to add this without consideration of affects.
Understand that I will only be opening the file for (R) READ TEXT access only.
Primarily I am concerned that Oracle (in the background) will keep a file pointer open or something of that nature that would block other programs from writing to the file even after I close the file pointer. I want to make as little impact as possible to the file system.
Which config file is used to change the os version(RHEL 4.0 to RHEL 5.5) by OS admin what will be its impact on ORACLE Databases.
View 3 Replies View Related Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit
PL/SQL Release 11.1.0.6.0 - CORE 11.1.0.6.0
TNS for Linux: Version 11.1.0.6.0 - NLSRTL Version 11.1.0.6.0
When I checked the status of $emctl status dbconsole. I got this error OC4J Configuration issue.
I was told by the forums to drop and recreate the repos. But I noticed the moment you drop the repos you will loose the passwords of SYSMAN and DBSNMP. emca -deconfig dbcontrol db -repos dropemca -config dbcontrol db -repos createI tried default passwords does not worked. it looks like the only option I have is to reset the passwords. but my main concerns is this impact the DB in generally or its common. or is there any other way we can get the OEM back(I already dropped the repos).
my sql query has three tables in from clause so it has two join conditions and one where condition.
account_no is number data type and v_account_no is varchar2() data type
The where clause is :
"where account_no=to_number(v_account_no)" with this condition in my sql query has the cost 392
we just modify the where clause as where v_account_no=to_char(account_no) with this condition in the sql query has the cost 11.
what is impact of this data type conversion and difference between these two "to_number() and to_char()" in performance wise to reduce the cost of query?
I have been used to the consciousness that we should use the minimum length for varchar2 field that can store the data we need manipulate. But recently I was told that it has little impact on performance if we assign a much longer size.
View 13 Replies View RelatedAny impact is there if is do the following:
ALTER TABLE MY_TABLE TRUNCATE PARTITION P1 UPDATE GLOBAL INDEXES;
will there be any lock on the table during this operation? DML operations will work without any issue or not?
I am looking at a performance issue at the moment and trying to replicate on a test system. I am initially looking at the impact of upto-date statistics on the main schema's objects.
For this I wanted to:
first run the batch with whatever stats were present in the database Flashback the db to before the batch . Gather stats Re-run the batch with updated stats and compare results.
However, I inadvertently ran the stats job before running the load the first time! I have the SCN from when the environment was set up like production (ie before the stats were run) so am I correct in saying that if I flashback to this point then the stats will be "old" and I can just run the batch then? I know I can verify this when I Flashback the database by looking at LAST_ANALYZED on tables etc but it would be good to know this before hand as it's a 12 hour batch.
db and dev 10g rel2 ,suppose that i have a table with a lot of duplicate rows ,what i need is to delete the duplicates and retain one row of these duplicates . likecolumn -- with those values...how to delete two (hi's) and retain the third , ?it is all applied to all the duplicate values in the column.
View 5 Replies View RelatedTrying to delete duplicate rows from a table. The problem is, they aren't exactly duplicate rows. Let me explain.
I am migrating data from a Oracle 8.1.7 db to a 10.2.1 db. In the older db, this certain table does not have a PK/Unique Index, but in the new db there is a unique index. The fields that the index is unique on are:
SUBSCR_NO, SUBSCR_NO_RESETS, EXTERNAL_ID, EXTERNAL_ID_TYPE, ACTIVE_DATE.
In the old db, when I run this query I get 1229 rows. With a count of 2 each.
select SUBSCR_NO, SUBSCR_NO_RESETS, EXTERNAL_ID, EXTERNAL_ID_TYPE, ACTIVE_DATE, count(*)
from customer_id_equip_map
group by SUBSCR_NO, SUBSCR_NO_RESETS, EXTERNAL_ID, EXTERNAL_ID_TYPE, ACTIVE_DATE
having count(*)>1;
They are duplicates on those fields, but they are not totally duplicate rows because there is a field called is_current that has 0 in one row and has 1 in the other. What I need to do, is delete the 1229 rows with is_current=0.
To remove fragmentation which is the best method.
First one :
-----------------
1)Created a backup table from the Fragmented table (This table is a partitioned one).
2)Analyzed this table.
3)DROP the Fragmented table
4)Inserted the backuped up data from backup table to the Re-created table.
5)Analyze this table.
Second method
-------------------
1) Create a backup table newly, with PCTFREE =0
2) Inserted the data from Fragmented table ( This is a partitioned table) to backup table
3) Analyzed this table.
4) Truncate Fragmented table
4) Did Exchange partition of Fragmented table with Backup table.
The second method is not found to be removing the Fragmentation. Before the fragmentation was 28% after Second method the fragmentation is still the same. While the first method the fragmentation reduced to 16%.
Query used to find Fragmentation.
select table_name,
round((blocks*8),2) "table size kb",
round((num_rows*avg_row_len/1024),2) "actual data in table kb",
round((blocks*8),2)- round((num_rows*avg_row_len/1024),2) "wasted space kb",
[code]...
TYPE CashRecord IS RECORD(client_id VARCHAR2(100),
account_letter VARCHAR2(100),
cash_amount VARCHAR2(100),
cash_amount_ccy VARCHAR2(100) );
TYPE CashRecordTable IS TABLE OF CashRecord INDEX BY VARCHAR2(100); -- Indexed by client_id~account_letter~ccy
So if I did something like this;
l_cash_records CashRecordTable;
-- say for example that l_cash_rec/l_cash_rec2 has been defined..
l_cash_records('some index') := l_cash_rec;
l_cash_records('some index 2') := l_cash_rec2;
l_cash_records.COUNT would give me 2
How can I somehow remove 'some index 2' so that l_cash_records.COUNT is 1 ?
This is a simple question, but I cannot seem to find a solution. Here's the basic query:
select distinct accountno, parcelno, streetno||' '|| predirection ||' '|| streetname||' '|| streettype||' '|| postdirection||' '|| unitname||', '|| propertycity
from tblacctpropertyaddress ....
What I want to do is add is this logic: If Predirection is null, then no space between streetno & streetname. Same for postdirection and unitname. (for example, if both postdirection and unitname are null, there are no spaces between streettype and the comma before propertycity)
Also, when unitname is not null, I want to add the string "Unit " prior to the returned value in unitname.
I am working with Oracle 10G, and have been working on setting up little pl/sql checks to make sure that the data that is imported is in the correct format.
The wall I have hit is removing illegal characters from the data I import. I have started to set something up where the string for a certain column must be be made of only there characters:
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-" (note that there is a - besides just letters) and I may want to add some other characters later. So basically the script will drop or replace any character not found in my definitions with "", thus removing the illegal character and joining the previous and next characters.
I thought for sure there would be a script posted somewhere online that did this but I can't find it and my syntax skills are lacking.
I have requirement to suppress the duplicate nodes on same level in hierarchy query.
Below given is the script for it.
CREATE TABLE NODE_LVL (PARENT_NODE VARCHAR2(100), CHILD_NODE VARCHAR2(100));
INSERT INTO NODE_LVL VALUES('TBL_APL','TBL_AFL');
INSERT INTO NODE_LVL VALUES('TBL_APP','TBL_ACS');
INSERT INTO NODE_LVL VALUES('TBL_ADD','TBL_ADW');
INSERT INTO NODE_LVL VALUES('TBL_ADP','TBL_ADV');
INSERT INTO NODE_LVL VALUES('TBL_AOP','TBL_AOV');
[code]......
Table 'TBL_APP' is having 2 parent nodes i.e 'TBL_AOV' and 'TBL_ADV'
SELECT * FROM node_lvl WHERE child_node = 'TBL_APP';
At level 5 there is duplicate nodes i.e 'TBL_APP' and 'TBL_ACS' as parent_node and child_node respectively.
SELECT PARENT_NODE, CHILD_NODE, LEVEL FROM NODE_LVL START WITH PARENT_NODE = 'TBL_ACF' CONNECT BY PRIOR CHILD_NODE = PARENT_NODE;
I want to suppress such duplicates. So I added DISTINCT
SELECT DISTINCT PARENT_NODE, CHILD_NODE, LEVEL FROM NODE_LVL START WITH PARENT_NODE = 'TBL_ACF' CONNECT BY PRIOR CHILD_NODE = PARENT_NODE;
BUT requirement is to maintain the same order (of hierarchy) as it was before adding DISTINCT.
I've a table in data warehouse production with data which is partitioned by RANGE, sub-partitioned by HASH.Later we realized that subpartitioned are not needed as volume is less.
I tried below approah in DEV DB:
1. create table ABC_BAK as select * from ABC;
2. dbms_metadata.get_ddl('TABLE','ABC')
3. Removed the subpartitions details from the output of step 2 and prepared the script of create table without subpartitions
4. Drop table ABC
5. Create table ABC from script step 3.
6. Insert into ABC select * from ABC_BAK
7. Drop table ABC_BAK
I am persisting xml with below mention tag which contains preformatted text data.
<SECTION>
<HDG><![CDATABusiness Summary]></HDG>
<BODY>
<![CDATA[(C) 2008 D&B
COPYRIGHT 2008 DUN & BRADSTREET INC. - PROVIDED UNDER CONTRACT
FOR THE EXCLUSIVE USE OF SUBSCRIBER 263763803.
ATTN: null
[code]....
Now, when i retrieve this xml from oracle CLOB column, i am getting data in body tag as below:
(C) 2008 D&B COPYRIGHT 2008 DUN & BRADSTREET INC. - PROVIDED UNDER CONTRACT FOR THE EXCLUSIVE USE OF SUBSCRIBER 263763803. ATTN: null US TEST COMPANY 984 DUNS: 36-252-8379 RATING DS US FICTITIOUS COMPANY 984 BUSINESS SERVICES EMPLOYS UNDETERMINED 899 EATON AVE SIC NO. BETHLEHEM PA 18025 7389 TEL: 610 882-0005 RICHARD DOE, MANAGER RECORD TYPE: DUNS SUPPORT THE "DS" INDICATOR ASSIGNED TO THIS BUSINESS MEANS THAT THE LIMITED INFORMATION CURRENTLY IN THE D&B FILE DOES NOT ALLOW US TO CLASSIFY IT WITHIN OUR RATING SYSTEM. WE ARE PROVIDING THIS INFORMATION TO YOU IN THE INTEREST OF SPEED WITHOUT HAVING COMPLETED AN INVESTIGATION. THEREFORE, THIS REPORT MAY NOT REFLECT THE CURRENT STATUS OF THIS BUSINESS. D&B CAN INVESTIGATE THIS BUSINESS AND UPDATE THIS INFORMATION BASED ON THE RESULTS OF THAT INVESTIGATION.
All text formatting goes for a toss (newline, trailing tab characters are getting trimmed).provide any inputs on how to avoid this. Text formatting needs to be preserved.
I am trying to remove duplicates from a table with over 10million records. Below query is working fine but it doesnt contain any COMMIT interval. I have to commit after every 20k or 30k records deletion for which IF loop is necessary.
Query:
delete from
customer
where rowid in
(select rowid from
(select
rowid,
row_number()
over
(partition by custnbr order by custnbr) dup
from customer)
where dup > 1);
I am using Oracle 9i and Unix on my system and trying to execute a UNIX shell command through external procedure in C.I created a shared lib (libextproc.so) for the following function.
int sysrun(char *command)
{
return system(command);
}
This function runs fine when caled through a driver function in C, meaning that the shared lib is fine.In PL/SQL, I have used the following method to invoke a UNIX command:-
create or replace library shell_lib as '/home/ECETRAonsite/oracle/OraHome1/lib/libextproc.so';
/
create or replace function sysrun (syscomm in varchar2)
return binary_integer
as language C
name "sysrun"
library shell_lib
parameters(syscomm string);
/
Now when I call this PL/SQL function to invoke the command, it is run succesfully but does not create the file.
SQL>
1 declare
2 rc number;
3 begin
4 rc := sysrun('/bin/touch /home/ECETRAonsite/oracle/OraHome1/test/sach');
5 dbms_output.put_line('Return Code='||rc);
6* end;
SQL> /
Return Code=0
PL/SQL procedure successfully completed.I have verified that the path for 'touch' is correct.Following are my configuration files.
listener.ora
-------------
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
[code]...
The other day, we had a query run amok in our 2-node production cluster. The 3 temp files for the temp tablespace were all still set to autoextend unlimited, something I forgot to change after a recent upgrade. I created 3 new temp files and tried to delete the huge temp files. I did this from sqlplus with this commad:
ALTER TABLESPACE PSTEMP DROP TEMPFILE '+DATA/isis/tempfile/pstemp.291.641298061';
The huge files are still in ASM storage. dba_temp_files reports that the status of them is AVAILABLE but they have no RELATIVE_FNO. Grid Control reports their status as OFFLINE and their size as 0. They are actually close to 20 GB each.
I tested the above alter statement in two test instances, also RACed with ASM storage and the temp files were successfully deleted, but they were much smaller in size. At this point, how do I delete the three 20GB files from ASM in our production instance? Why didn't they delete the first time?
I am trying to select a row on the screen and delete a individual row from the screen after hitting the delete button. Whenever i select the row it gets highlighted and also the alert box comes up asking if the record needs to be deleted. When I say yes I notice that the row does not get deleted. The code behind the delete button is as follows
(P.S the block is based of a table and commit_form works and changes are saved to db but not delete_record)
begin
--
Set_Item_Property('my_block.emp_no_copy',current_record_attribute,'va_delete_record');
Set_Item_Property('my_block.emp_LName_copy',current_record_attribute,'va_delete_record');
Set_Item_Property('my_block.emp_FName_copy',current_record_attribute,'va_delete_record');
Set_Item_Property('my_block.last_worked_date_copy',current_record_attribute,'va_delete_record');
--
synchronize;
Set_Alert_Property(alert_id, ALERT_MESSAGE_TEXT, 'Do you want to delete the Highlighted record? {NOT YET}');
[Code]....
Due to improper documentations of a certain project, I need to drop a DEFAULT tablespace of a newly created instance including it's associated datafiles by using this command:
"DROP TABLESPACE <tablespace name> INCLUDING CONTENTS AND DATAFILES;"
The default tablespace name is QWER (qwer01.dbf) and I added 2 datafiles in it, re: OPD_SML01.dbf & EXYT_SML01.dbf.
Do I have to do it online or offline?