Tivolo storage manager error message is Database Cache Hit Ratio is too low

Hi basis friends,we are performing incremental backup from mon-fri.from past two days i was getting error message as 'data base cache hit ratio is too low (97.3,98)and increase buffer pool size value.what is the problem for this error message? how can i overcome this error? give me detail analysis to the issue please.
Thanks and regards,
Nani

Hello Nani,
The database buffer cache hit ratio is the proportion of Oracle logical reads that do not require operating system (OS) read calls.
When an Oracle session accesses a block, Oracle executes an instruction path that determines whether or not that block is already in the database buffer cache. We refer to this instruction path as an Oracle logical I/O call.. If the block is not in the buffer cache, then Oracle will execute an OS read call. We refer to this as a physical I/O call.It must be ideally close to 99% and since in your case it is low,that is why you are getting these errors
Now to increase this you will have to increase the vakue of shortbuffer pool size as suggested by Tivolii.
Fo that you wil have to increase the value of parameter DB_CACHE_SIZE if you are using Oracle 9i.
Go through the following link http://download.oracle.com/docs/cd/B13789_01/server.101/b10752/memory.htm
which will help you understand the concept better
Hipe it helps
Rohit

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Database cache hit ratio is very low is about 11%

Dear all,
Our SAP ERP development server is on sap distributed environment in
vmware esxi environment.
centeral instance information
AEOM1SAP08(172.16.1.87)
RAM : 4 GB
CPU : 4 core processors 2.93 Ghz, 2.93 Ghz
SWAP : 25 GB
database server information
AEOM1SAP04(172.16.1.83)
RAM : 20 GB
CPU : 8 core processors 2.93 Ghz, 2.93 Ghz
swap :40 GB
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EDE sap enterprise portal server (database buffer pool memory 8 GB )
AES sap solution manager server (the database currently stopped )
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proc cache memory --> 1.5 GB and Hitratio 98%
SQL memory setting --> FIXED
and the warning are coming as follows
latch wait time per request(ms) execeeds 20 milliseconds
wait time per log write(ms) execeeds 10 milliseconds
check the IO performance of the database server
and In SM12 large of tables are locking and is running very slow users
are not able perform their work in development server
below iam attaced required information
thanks and regards
sudheerk
7382383262

Hello,
Please check
Note #987961 FAQ: SQL Server I/O performance
regards,
John Feely

Database Cache Hit ratio is very less

Hi All,
my live database Cache Hit ratio is very less. can some one proposed relevant solution for that.
SELECT (1-((phy.value-phyd.value) / (cur.value + con.value))) * 100 "Cache Hit ratio"
FROM v$sysstat cur, v$sysstat con, v$sysstat phy, v$sysstat phyd
WHERE cur.name = 'db block gets'
AND con.name = 'consistent gets'
AND phy.name = 'physical reads'
AND phyd.name = 'physical reads direct';
Cache Hit ratio
47.99717699362490769958384625413175240442
select NAME,VALUE from v$parameter where name like '%db_cache_size%';
NAME VALUE
db_cache_size 335544320
select name, value From v$sysstat
where name in ('db block gets', 'consistent gets', 'physical reads');
NAME VALUE
db block gets 30047032214
consistent gets 691770165681
physical reads 376120181932
Thanks

user1093072 wrote:
Hi all thanks a lot for your answers. i am getting some query time outs and while investigating got less ratios. can some one tell me how to get dicission using this ratios
Buffer Hit % 95.71
Cache Hit ratio 47.99The fact that you get two different values for "the same thing" is a clue that (a) your SQL statement is suspect and (b) your logic is flawed.
You SQL is going to give you some kind of (meaningless) average since the database started up. The report you showed looks like part of an AWR or statspack report which will be covering a short interval of time. The difference between the two percentages may mean the two approaches are using different formula, or it may mean that the result is highly dependent on the time window.
Since you have access to AWR/statspack - run off a report for a (short) interval when the system is performing well, and for when the system is performing badly, and compare them.
As a starting point you could post the two sections "Load Profile" and "Top 5 Timed Events" to the forum for initial comment. If you do so, please make sure you use the "code" tags (see end of post) to make the output readable or you may get no replies.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
To post code, statspack/AWR report, execution plans or trace files, start and end the section with the tag {noformat}{noformat} (lowercase, curly brackets, no spaces) so that the text appears in fixed format.
There is a +"Preview"+ tab at the top of the text entry panel. Use this to check what your message will look like before you post the message. If it looks a complete mess you're unlikely to get a response. (Click on the +"Plain text"+ tab if you want to edit the text to tidy it up.)

Low database cache hit ratio (85%)

Hi Guys,
I understand that high db cache hit ratio doesn't indicates that the database is healthy.
The database might be doing additional "physical" reads due to un-tuned SQL.
However, can explain why a low cache hit ratio might not indicate the db is unhealthy, as in the db need additional memory allocated?
What i can think of is probably:
1. the database might query different data most of the time. As such the data is not read again from cache before it aged out. Even if i add additional memory, the data might not be read again (from memory).
2. ?
3. ?
I'm quite reluctant to list out the databases with below 90% hit ratio as part of the monthly report to the management. To them, below 90% means unhealthy.
If these ratios to be used in monthly report, there will be a long section to explain why these ratios cannot meet but there is no performance concern.
As such will need your expert advise on this.
thanks
Edited by: Chewy on Mar 13, 2012 1:23 AM

Nikolay Savvinov wrote:
In isolation, ratios are useless, but trends in ratios can point to potential problem. If your BCHR is steadily degrading over time, this is something to worry about (you'll have to examine your application for scalability issues)
I used to think that there was a case for trending through a ratio in the days when databases were small, simple and (by modern standards) not very busy. But I'm no longer sure it was even a good idea then. How much of a change do you need to see before you start worrying - and what time-granularity would you take as your baseline. When a ratio varies between 98% and 99% during daylight hours, how do you spot a very large problem that's only going make a change of 0.01% over the course of a couple of weeks ?
I really don't think there's any good SIMPLE way of producing a management sound-bite for every database in the system; each database needs a personal touch, and the number of figures you need to supply on each is not going to be easy to grasp without some graphic assistance. A suggestion I have is simply to pick three "representative" queries from the application (one "small", one "medium" and one "large") and run them once every hour, capturing the plan_hash_value, elapsed time, disk-reads, buffer gets, and CPU for each. A daily graph - 4 lines each - of each query will give management the big picture of variation in response time; a longer term graph based on the daily average with (say) best and worst excluded will give a trend warning. Obvously each database (or even application within database) needs its own three queries, and there may be periods during the day when it is not relevant to worry about a particular query.
(NB In the past I've run baseline queries from a pl/sql package called by dbms_job, or dbms_scheduler, and stored the resulting cost figures in the database - capturing all the session stats, wait event and time model information)
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
Author: <b><em>Oracle Core</em></b>

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Please see the image.
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Cache hit ratio at enterprise manager

hit ratio formula is:
(logical_reads - physical_reads/logical_reads )*100
Now, if I open Oracle Enterprise Manager and goes to Instance->Configuration->Memory I can see SGA and PGA configuration. I can also see the cache hit ratio, in my case 35%, but it seems that this is not the formula I mentioned above, because when I execute that formula i get 75% hit ratio:
SELECT 1 -(phy.value / (cur.value + con.value)) "CACHE HIT RATIO"
FROM v$sysstat cur, v$sysstat con, v$sysstat phy
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CACHE HIT RATIO
,749500702
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Hi Elidas,
what is that hit ratio at Oracle Enterprise Manager? Thet don't publish their formula, but you can log an SR and ask.
By itself, the buffer cache hit ratio is not very meaningful, and the data buffer cache hit ratio is largely meaningless for decision support and data warehouse applications because of their propensity to have full-table scans and parallel full-table scans (which may bypass the data buffers entirely, using PGA memory).
The buffer cache hit ratio is most meaningful for databases with an undersized db_cache_size, where the "working set" of frequently-referenced data has not been cached. Oracle provides the data buffer cache advisory utility (v$db_cache_advice) in the standard AWR report. (and later releases of STATSPACK reports). Oracle has expanded the advisory utilities to include a shared pool, Java and PGA advisory.
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http://www.dba-oracle.com/m_buffer_cache_hit_ratio.htm
Hope this helps. . .
Donald K. Burleson
Oracle Press author

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Tivolo storage manager error message is Database Cache Hit Ratio is too low

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