Server Administration :: Negative Values Of Library Cache Hit Ratio In AWR Report
Jul 29, 2012
We are getting Negative values of Library cache hit ratio in AWR Report of 11g(11.2.0.3) with Solaris[tm] OE (64-bit). Why it shows negative value.
Instance Efficiency Percentages (Target 100%)
Buffer Nowait %: 99.87 Redo NoWait %: 99.99
Buffer Hit %: 92.17 In-memory Sort %: 100.00
Library Hit %: -3,321.23 Soft Parse %: 81.95
Execute to Parse %: 92.88 Latch Hit %: 95.11
Parse CPU to Parse Elapsd %: 87.25 % Non-Parse CPU: 81.39
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May 20, 2013
what will be best buffer cache hit ratio for a database for good performance
note : in general
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Mar 16, 2013
understand the metric Row Cache Hit Ratio in V$SYSMETRIC_HISTORY? Is it the dictionary cache hit ratio?
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Mar 3, 2011
Database : 9.2.0.7
Os : windows 2003 sevrer standdard edition
RAM 4 Gigs
The buffer cache hit ratio in this server is around 83%, where it normaly was around 98% before i did some maintenance activities.
I have done some maintenance activities in January on this database.
Maintenance activties includes below steps
1.In production i have deleted old data in the production tables
2.Reorganized tablespaces,tables
3.Rebuild indexes for those tables.
4. At last collected statistics for those tables.
Now after this activity the buffer cache hit ratio is very low.
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Jun 30, 2011
At a customers site I see lot of long lasting library cache locks during a complex ETL run. Several Sessions run in parallel and create Database tables with dynamic sql ( CREATE TABLE AS SELECT ....) .
Sometimes these procedures wait for each other with wait event 'Library Cache' . I presume that this is a side effect of the dynamic DDL in the stored procedures. Is that possible even when the Procs create different Tables but reference the same tables in their SELECT clauses ?
I presume that this is plausible but I need some arguments to convince my colleagues.
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Apr 28, 2011
I have one column table with negative and positive values and want to display positive and negative values in different columns thru a single query.
Column
1
-4
3
-6
output should be like
A B
1 -4
3 -6
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May 6, 2010
i am doing a data transformation using the following function
FLOOR(ONSET_TPQ-VAX_DATE)
Where ONSET_TPQ and VAX_DATE are both dates. Now in a situation where the ONSET_TPQ precedes VAX_DATE I want the result to be null for those records. As an example if ONSET_TPQ= 2000 and VAX_DATE=2010
I want the result to be NULL as I dont want negative values. Any exact SQl syntax on how to do that. DO i write a case statement?
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Feb 28, 2012
How to move a partition of a table to db_keep_cache ?
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Aug 19, 2010
1)If i issue a DELETE statement to delete a row, will this statement drag any data from the datafile to database buffer? How is the change made by a DELETE statement recorded in buffer cache? How is this change then applied to the data in datafiles after commit?
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Mar 28, 2011
How can i know which objects used keep buffer cache?
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Jan 26, 2011
Say Database Buffer Cache configured as 2M and my updates may use 4m size,will it throw an error message or update will happen perfectly without any issues?
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Jun 20, 2013
What is the difference between cache fusion and Cache Coherency. Both are same or different functionality.
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Jul 10, 2012
I have some question.
TTversion : TimesTen Release 11.2.2.3.0 (64 bit Linux/x86_64) (tt112230:53376) 2012-05-24T09:20:08Z
We are testing a AWT cache group ( with CacheAwtParallelism=4 ).
Application(1 process) to the DML generates to TimesTen(DSN=TEST).
At this point, Are delivered to the 4 parallel DML?
[TEST]
Driver=/home/TimesTen/tt112230/lib/libtten.so
DataStore=/home/TimesTen/DataStore/TEST/test
PermSize=1024
TempSize=512
PLSQL=1
[code].......
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Dec 21, 2011
Currently there is only one report server for publishing reports in our application server . Its a standalone installation, oracle load balancing is not installed.I am thinking about starting atleast three more report servers to increase the performance
1) Having multiple report server increase performance or not?
2) Oracle report server load balancing how it is configured on same one sever?
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Aug 18, 2010
Is there any script to run or a way in oracle database to get the whole database structure such as (Tablespaces, schemas, datafiles, redo-log files, tables(structure), views....etc) plus the number of daily transactions and operations happens such as (insert, delete, update,...etc)
Generally, a fully detailed report of my database structure, changes in structure and daily DML operations.
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Apr 22, 2013
We are not using enterprise manager. Now, i want to generate ADDM report for the particular SQL stmt. How can i do that?
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Nov 7, 2011
I have an AWR report based on two snapshots one an one hour time window, under the "SQL ordered by Elapsed Time" section, there is a query having Elapsed Time = 7012 seconds, which is almost two hours, how is this possible? I have been told that this i aggregate value of all sessions.
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Feb 7, 2013
I have only select_catalog_role in my database.
Is it possible to generate statspack report without having access to perfstat account?
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Sep 14, 2011
,i had given the sample data below
create table ex (sno number,ename varchar2(10),job_code char(4),sal number);
insert into ex values(101,'John','Java',21000,'IT');
insert into ex values(102,'Michel','BI',25000,'IT');
insert into ex values(103,'Johny','Java',30000,'IT');
[code]...
My expected output is attached in a text file
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Jan 9, 2012
I am doing a Gross Profit percentage. I want to display zero if the GP% is have negative value.
for example
If GP% shows -75 I want to display as 0.
trunc((sum(total)-(sum(DECODE(po_pur,'',0,PO_PUR))+sum(DECODE(pl_pur,'',0,PL_PUR))+SUM(parts))) / SUM(DECODE(TOTAL,0,1,TOTAL))*100,2) "GP%"
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Aug 5, 2013
SQL> select name,decode(unit,'bytes',value/1024/1024,value) as mb from v$pgastat; NAME MB---------------------------------------------------------------- ----------aggregate PGA target parameter 25600aggregate PGA auto target 2724.14648global memory bound 1024total PGA inuse 22601.7333total PGA allocated 26653.6230maximum PGA allocated
[code]....
I understand I have soft limit( aggregate PGA target parameter) which was overlimited (maximum PGA allocated = 35374.4638) hence we have over allocation count>0.Extra bytes read/written=13GB,hence we have excessive 13Gb that we had to flush on disk(excessive I/O operations) cause of limitation in 1024MB(global memory bound)(it's not enough to join or to sort something so we must do onepassor multipass) ,which defines the size of single operation of sort or join(so does it mean that it's some kind of sort_area_size and hash_area_size for automatic workarea_size_policy? and in this case what about _smm_max_size?)aggregate PGA auto target - is the amount of space(total) that Oracle can give for work areas running in automatic mode.
So I can't understand ratio between global memory bound and aggregate PGA auto target - why does the aggregate PGA auto target such tiny?(relatively process count)?Is the global memory bound static for particular aggregate PGA target parameter?
I can change it only by redefining aggregate PGA target parameter?What would be with aggregate PGA auto target if I started 10 sort operation and each of them takes about 1Gb of memory.How huge it would be? 10Gb?
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Apr 24, 2012
I am currently working on a Data Dictionary project where we need to run a few rules against the give data sources to see if they all comply together.
One of the rule is to check if the no. is negative or not. So for that what I tried to do was to check if first the field is number or not and then check on if it is negative or not.
This is the code I am currently trying on and is not looking good.
SELECT 1 FROM DUAL
WHERE decode(DECODE( TRANSLATE('-123.45','-0.123456789',''), NULL, 1,0), 1,substr('-123.45',1,1) ,' ' ) = '-'
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Jul 15, 2011
I found the data in DB with negative time as below
Quote:
1 SELECT
2 c.time
3 FROM partition c
4 WHERE
5* c.time < to_date('0001-01-01','YYYY-MM-DD')
SQL> /
DEACTIVATION_TIME
------------------------------------------------------------------------
17-JUN-08 04.06.22.893 PM
The data type for c.time is Timestamp.
When I use JDBC to retrieve the data and convert it to mill seconds, and it also shows as negative time. My question is the retrieved time doesn't show the negative date, but obvious it is a BC date and earlier than 0001-01-01.
1. How can we detect/show the date to show correctly for the BC date without checking c.time < to_date('0001-01-01','YYYY-MM-DD')? (I am wondering if there is format configuration to show the time like 17-JUN-08 04.06.22.893 PM BC, or something to show the time is negative )
2.how could we fix it negative time to positive ?
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Dec 15, 2010
I am working on a script that is reading from a numeric column converting it to a character string where the decimal is dropped (assumed) and the value is padded with leading zeros to fill the specified lengh. Using to_char(payment_amt,'FM0000000V00') is working fine for non-negative values. When the value of the field is a negative number the output includes a leading - (i.e., -000002458).
For the negative numbers I need to convert them to a 'Signed EBCDIC' value, where the last digit is converted to a specified character (in the above example it would be changing the 8 to a Q) and also replace the - with a zero, resulting in 00000245Q.
What I am doing is generating a fixed-length record with values in a specific location. What I'm getting now looks like this:
AAAA 000002358 BBBBBBB
CCCC -000002458 DDDDDDD
EEEE 000024555 FFFFFFF
And what I need it to look like is:
AAAA 000002358 BBBBBBB
CCCC 00000245Q DDDDDDD
EEEE 000024555 FFFFFFF
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Nov 12, 2012
can you to display a field with negative value
S -- format mask display both sing + and -
MI -- format mask display negative sign at end
PR --Returns negative value in <angle brackets>. and Returns positive value with a leading and trailing blank.
I want the output should display only leading negative if the value is negative. I have used S99990.99 as format Mask. but need output should display only leading negative if the value is negative.
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Sep 3, 2010
query for number of users connected to the database:
select count(*) "Number of users Connected" from v$session where type='USER'; it produces 125
The following query is used to describe where and when the users are connected to the database.
set pages 500
set linesize 750
column box format a20
column username format a7
column program format a20
column os_user format a20
[code]...
It should produce 125. But its showing only 119 users. so around 6 users missing in the list. find why 6 users are not listed..
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Oct 21, 2012
For the below query:
SELECT id, pob,exp
FROM emp
where exp= (:exp)or @exp is null
O/P:
id pob exp
_____________________
1 CT 2
2 NJ 3
3 NY 2
It takes only one value of :exp but, I would like to give multiple values separated by ','. My problem is the parameter can be either single value or Blank or multiple values. My code do work for single value and Blank, Now how to implement multiple values .
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Dec 17, 2011
In my report I'm using inner join in queries .I got correct record but itz repeated.How to deduct that repeat values?
this is my query:
SELECT f.feeid,
f.studentid,
( s.first_name + last_name )AS studentname,
b.branchname,
c.coursename,
y.yearname,
[Code].....
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Jul 3, 2012
how I can profile values to be displayed in RDF report.Here is what I have in my before report trigger
srw.USER_EXIT ('FND SRWINIT');
apps.fnd_client_info.set_org_context(FND_GLOBAL.ORG_ID);
:CP_Fnd_User :=FND_GLOBAL.USER_NAME;
:CP_CompanyName := FND_PROFILE.VALUE('xx');
When I print the value of the user name it gets printed fine.But when I print the place holder column value for the profile I get null.
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Feb 25, 2011
I want to Fix Null values as 0 in Matrix Report. But i am not able to Do it...
let it be there is one item NUM1
what Sequencing and triggers(format trigger or else) should i follow on it with what code?
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