Any link having various Hit ratios and SQL's to calculate them

Hi
Can an ybody give me the link having various Hit ratios in Oacle9i and SQl's to calulate them????How about using advisors than calclating the Hit ratios??
Regards
Gagan

Please be aware that ratios are only helpful in tuning in a relatively small set of circumstances. For instance, if you have just set up a new database and need to montitor the effectiveness of certain init.ora parameters. Ratios can be useful in diagnosing system wide problems but only if you have sufficient understanding of your system to know what is a "good" value. A buffer cache hit ratio of 95% might be bad, a hit ratio of 70% might be great, it really depends on the nature of you application. There is a useful little piece by Jonathan Lewis on his site which compares the value of mining the underlying data for information about the system over looking at the headline ratios. Find out more.
The standard Oracle tools - such as OEM and Statspack - include ratios as part of their offering.
Cheers, APC

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I am reading the note 33833.1 on Metalink web site. I have diffult to understand the part in the last page of the note. In the last page author talk of a situation where the cache hit ratio is near 100% but the system is not good because. the author talk of a bad sql statement using a non selective index.
Anyone can explain me this situation ?
thanks for all

Because it can be spoofed easily, cache hit ration should never be used as an indicator of system performance. I could not find the article you refered to I can explain it this way:
Repeatedly hitting the same large amount of datablocks to return a small amount of data will show an artificially high buffer cache hit ratio because the same block get hit over and over, even though most of the data in them is irrelavent.
Another example would be using subquries instead of joins or joins on inline views.
All that being said, a low buffer cache hit ratio over an extended period of time is an indicator that the cache is too small, however a high buffer cache hit ration does not mean that is the right size.
(it's Monday, I hope this makes sense.)

Idoc Hit ratio and Idoc Table

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Buffer cache hit ratio query

Hi,
I would appreciate some advice please.
My Oracle 10.2.0.4.0 database starts off in the day with a buffer cache hit ratio of almost 100% but this drops gradually in the course of the day as the system gets busier. Is this something I need to be concerned about if no performance problem has been reported by the users?
I would have thought this should be a normal situation, i.e. as the system gets busier, I would expect that less number of calls to the buffer cache will be satisfied because many more calls are using up the memory?
Please note that I've done some reading up on this but would like some suggestions from more experienced people than myself on what I should normally expect and what should or should not be a concern.
thanks

user8869798 wrote:
hi,
thanks again for your response and apologies for not being able to get back yesterday.No problem :) .
>
- What i am doing and how - it is the backend database r our Finance application, many users with various transactions.Okay , that sounds like a "normal" database with normal workload.
- configuring buffer cache size - I haven't done anything manually yet, it's all been as installed, this is what I'm trying to figure out whether it is something I should be looking into doing simply because of the dropping hit ratio and not because of any reported performance problem.If you don't have much of the knowledge, its the best to take use of the advisories which would tell you in a better and in a graphical way that whether you should or shouldn't be worries. Look at the view v$db_cache_advice which can suggest to you that whether you would need to tweak the buffer cache or not.
>
- looking at the queries - What is the easiest way of doing this in an environment where many users are running different queries? What's the easiest way to identify queries that we may need to have a closer look at?Easiest way? Well, let the users come back to you ;-) .
>
- Basically, I'm just trying to ascertain whether or not I need to be concerned that my hit ratio drops below 89% even though no performance problem has been reported. If it is something that I should look into, then what is the best way to go about it?
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Buffer, library,dictionary, shared pool, redo log buffer chache hit ratios

Can please one provide information and sql queries to calculate Buffer, library,dictionary, shared pool, redo log buffer chache hit ratios and if any other ratio for investigation of performance issues in oracle 10g database (10g.1 and 10g.2 both). thanks in advance.

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HSODBC connectivity between ORACLE 10g and SQL Server 2008 R2

Hi,
I'm getting below error when using the DB link between Oracle (10.2.0.2 which is on Sun Sparc) and MS Sql server 2008 R2.
ERROR at line 1:
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
[Generic Connectivity Using ODBC][Microsoft][ODBC Driver Manager] Data source
name not found and no default driver specified (SQL State: IM002; SQL Code: 0)
ORA-02063: preceding 2 lines from SCOPEX.WORLD
My Config files:
On Sun Sparc 5.9 where Oracle server is running.
TelemetryDB1 =
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Sunil,
You don't need an Oracle ODBC driver.
The way it works is that in the gateway init<sid>.ora file, in your case initTelemetryDB1.ora, the parameter HS_FDS_CONNECT_INFO points to a system DSN. This DSN should then be configured to use an ODBC driver to connect to the non-Oracle database. So, in your setup when you want to access the SQL*Server 2008 database then the DSN should use an ODBC driver that can connect to a SQL*Server 2008 database. If you still use the initTelemetryDB1.ora file for the connection then the TelemetryDB1 DSN should be configured to access the SQL*Server 2008 database.
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Note.1083703.1 Master Note for Oracle Gateway Products
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Buffer Cache hit Ratio

Hi All,
My DB Version: 10.2.0
OS: Windows Server 2003
I run the following script to get Hit ratio's
SELECT cur.inst_id, 'Buffer Cache Hit Ratio ' "Ratio", to_char(ROUND((1-(phy.value / (cur.value + con.value)))*100,2)) "Value"
FROM gv$sysstat cur, gv$sysstat con, gv$sysstat phy
WHERE cur.name = 'db block gets'
AND con.name = 'consistent gets'
AND phy.name = 'physical reads'
and phy.inst_id=1
and cur.inst_id=1
and con.inst_id=1
union all
SELECT cur.inst_id,'Buffer Cache Hit Ratio ' "Ratio", to_char(ROUND((1-(phy.value / (cur.value + con.value)))*100,2)) "Buffer Cache Hit Ratio"
FROM gv$sysstat cur, gv$sysstat con, gv$sysstat phy
WHERE cur.name = 'db block gets'
AND con.name = 'consistent gets'
AND phy.name = 'physical reads'
and phy.inst_id=2
and cur.inst_id=2
and con.inst_id=2
union
SELECT inst_id, 'Library Cache Hit Ratio ' "Ratio", to_char(Round(sum(pins) / (sum(pins)+sum(reloads)) * 100,2)) "Library Cache Hit Ratio"
FROM gv$librarycache group by inst_id
union
SELECT inst_id,'Dictionary Cache Hit Ratio ' "Ratio", to_char(ROUND ((1 - (SUM (getmisses) / SUM (gets))) * 100, 2)) "Percentage"
FROM gv$rowcache group by inst_id
union
Select inst_id, 'Get Hit Ratio ' "Ratio",to_char(round((sum(GETHITRATIO))*100,2)) "Get Hit"--, round((sum(PINHITRATIO))*100,2)"Pin Hit"
FROM GV$librarycache
where namespace in ('SQL AREA')
group by inst_id
union
Select inst_id, 'Pin Hit Ratio ' "Ratio", to_char(round((sum(PINHITRATIO))*100,2))"Pin Hit"
FROM GV$librarycache
where namespace in ('SQL AREA')
group by inst_id
union
select a.inst_id,'Soft-Parse Ratio ' "Ratio", to_char(round(100 * ((a.value - b.value) / a.value ),2)) "Soft-Parse Ratio"
from (select inst_id,value from gv$sysstat where name like 'parse count (total)') a,
(select inst_id, value from gv$sysstat where name like 'parse count (hard)') b
where a.inst_id = b.inst_id
union
select a.inst_id,'Execute Parse Ratio ' "Ratio", to_char(round(100 - ((a.value / b.value)* 100),2)) "Execute Parse Ratio"
from (Select inst_id, value from gv$sysstat where name like 'parse count (total)') a,
(select inst_id, value from gv$sysstat where name like 'execute count') b
where a.inst_id = b.inst_id
union
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from (Select inst_id, value from gv$sysstat where name like 'parse time cpu') a,
(select inst_id, value from gv$sysstat where name like 'parse time elapsed') b
where a.inst_id = b.inst_id
union
Select a.inst_id,'Chained Row Ratio ' "Ratio", to_char(round((a.val/b.val)*100,2)) "Chained Row Ratio"
from (SELECT inst_id, SUM(value) val FROM gV$SYSSTAT WHERE name = 'table fetch continued row' group by inst_id) a,
(SELECT inst_id, SUM(value) val FROM gV$SYSSTAT WHERE name IN ('table scan rows gotten', 'table fetch by rowid') group by inst_id) b
where a.inst_id = b.inst_id
union
Select inst_id,'Latch Hit Ratio ' "Ratio", to_char(round(((sum(gets) - sum(misses))/sum(gets))*100,2)) "Latch Hit Ratio"
from gv$latch
group by inst_id
/* Available from 10g
union
select inst_id, metric_name, to_char(value)
from gv$sysmetric
where metric_name in ( 'Database Wait Time Ratio', 'Database CPU Time Ratio')
and intsize_csec = (select max(intsize_csec) from gv$sysmetric)
order by inst_id
What i am getting after this is:
INST_ID Ratio Value
1 Buffer Cache Hit Ratio .83
1 Chained Row Ratio 0
1 Dictionary Cache Hit Ratio 77.5
1 Execute Parse Ratio 45.32
1 Get Hit Ratio 75.88
1 Latch Hit Ratio 100
1 Library Cache Hit Ratio 99.52
1 Parse CPU to Elapsed Ratio 24.35
1 Pin Hit Ratio 95.24
1 Soft-Parse Ratio 89.73
i have a doubt with buffer cache hit ratio, can anyone please help me to understand this

Buffer Cache Hit Ratio .83Quite weird value. It seems your system is doing all physical reads, which seems unrealistic.
I had a 10.2.0.1 database where i saw this kind of result for cache hit ratio and after patching it to 10.2.0.4, it started showing results correctly.
Probably it could be some Oracle 10g bug which made this odd display of hit ratio information in data dictionary. Can you try patching your database to latest 10g PSU, or contact Oracle support for a one-off patch for this problem
Salman

Calculate cache hit ratio

Hi,
How to calculate cache hit ratio and execution time for the below query
Select * from tab;
Nirmal

Fnord. Cache hit ratio is meaningless in the context of a single query. Come to that, it's meaningless in any context. Check out this handy utility from Connor McDonald which allows us to set the cache hit ratio to any value that pleases us.
So what is the actual problem that is troubling you?
Cheers, APC

Oracle Buffer Hit Ratio

I m using this query to find Oracle Buffer Hit ratio .Is this query right.Is there some other way of getting more accurate ratio
select trunc((1-(sum(decode(name,'physical reads',value,0))/(sum(decode(name,'db block gets',value,0)) + (sum(decode(name,'consistent gets',value,0)))))) * 100) from v$sysstat

Asif,
Too bad we couldn't meet when I happened to come to Bdesh coz if we could , we would had talked about the same topic for hours. If you are using this hit ratio as the tuning technique than you are not alone. There are so many dbas who are using hit ratio and loose sleep seeing not to a particular %. It was a method that was given years ago by Oracle reason being that at that time, databases , their loads, they were not too much. But now things have changed so should be the troubleshooting techniques. Search over this forum for the same topic and you would see some "cool" threads where some top-notch experts are talking about the same issue.
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Any link having various Hit ratios and SQL's to calculate them

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