Why increase db env cache not improve random access performance?

I want to improve bdb random access performance.
I built a bdb with 3,000,000 records and then test random access on these records. I assign db env cache with 100M, 200M and 500M. With more cache, the cache hit ratio has been increased. However, the overall performance is NOT improved (actually performance is a little poorer with bigger cache). Why does this happen? Any way to improve the performance?
I plan to change page size later. Any suggestion on the page size setting?

Below is the db_stat output of 100M cache.
Thu Feb 25 07:02:37 2010 Local time
53162 Btree magic number
9 Btree version number
Little-endian Byte order
multiple-databases Flags
2 Minimum keys per-page
4096 Underlying database page size
1007 Overflow key/data size
4 Number of levels in the tree
3000000 Number of unique keys in the tree
3000000 Number of data items in the tree
546 Number of tree internal pages
42286 Number of bytes free in tree internal pages (98% ff)
48388 Number of tree leaf pages
4939160 Number of bytes free in tree leaf pages (97% ff)
0 Number of tree duplicate pages
0 Number of bytes free in tree duplicate pages (0% ff)
3000000 Number of tree overflow pages
2259M Number of bytes free in tree overflow pages (81% ff)
0 Number of empty pages
0 Number of pages on the free list
125MB 2KB 24B Total cache size
1 Number of caches
1 Maximum number of caches
125MB 8KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
0 Requested pages mapped into the process' address space
9924074 Requested pages found in the cache (54%)
8125037 Requested pages not found in the cache
0 Pages created in the cache
8125037 Pages read into the cache
0 Pages written from the cache to the backing file
8094176 Clean pages forced from the cache
0 Dirty pages forced from the cache
0 Dirty pages written by trickle-sync thread
30861 Current total page count
30860 Current clean page count
1 Current dirty page count
16381 Number of hash buckets used for page location
26M Total number of times hash chains searched for a page (26174148)
132 The longest hash chain searched for a page
53M Total number of hash chain entries checked for page (53243413)
0 The number of hash bucket locks that required waiting (0%)
0 The maximum number of times any hash bucket lock was waited for (0%)
0 The number of region locks that required waiting (0%)
0 The number of buffers frozen
0 The number of buffers thawed
0 The number of frozen buffers freed
8125049 The number of page allocations
17M The number of hash buckets examined during allocations (17891415)
12 The maximum number of hash buckets examined for an allocation
8094176 The number of pages examined during allocations
1 The max number of pages examined for an allocation
0 Threads waited on page I/O
Pool File: md.bdbxml
16384 Page size
0 Requested pages mapped into the process' address space
131 Requested pages found in the cache (90%)
14 Requested pages not found in the cache
0 Pages created in the cache
14 Pages read into the cache
0 Pages written from the cache to the backing file
Pool File: md.bdbdb
4096 Page size
0 Requested pages mapped into the process' address space
9923933 Requested pages found in the cache (54%)
8125020 Requested pages not found in the cache
0 Pages created in the cache
8125020 Pages read into the cache
0 Pages written from the cache to the backing file
Pool File: compMd.bdbdb
4096 Page size
0 Requested pages mapped into the process' address space
10 Requested pages found in the cache (76%)
3 Requested pages not found in the cache
0 Pages created in the cache
3 Pages read into the cache
0 Pages written from the cache to the backing file
Default locking region information:
158 Last allocated locker ID
0x7fffffff Current maximum unused locker ID
9 Number of lock modes
1000 Maximum number of locks possible
1000 Maximum number of lockers possible
1000 Maximum number of lock objects possible
40 Number of lock object partitions
14 Number of current locks
104 Maximum number of locks at any one time
4 Maximum number of locks in any one bucket
0 Maximum number of locks stolen by for an empty partition
0 Maximum number of locks stolen for any one partition
20 Number of current lockers
35 Maximum number of lockers at any one time
13 Number of current lock objects
101 Maximum number of lock objects at any one time
3 Maximum number of lock objects in any one bucket
0 Maximum number of objects stolen by for an empty partition
0 Maximum number of objects stolen for any one partition
12M Total number of locks requested (12049088)
12M Total number of locks released (12049068)
0 Total number of locks upgraded
35 Total number of locks downgraded
0 Lock requests not available due to conflicts, for which we waited
0 Lock requests not available due to conflicts, for which we did not wait
0 Number of deadlocks
0 Lock timeout value
0 Number of locks that have timed out
0 Transaction timeout value
0 Number of transactions that have timed out
736KB The size of the lock region
0 The number of partition locks that required waiting (0%)
0 The maximum number of times any partition lock was waited for (0%)
0 The number of object queue operations that required waiting (0%)
0 The number of locker allocations that required waiting (0%)
0 The number of region locks that required waiting (0%)
3 Maximum hash bucket length
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Lock REGINFO information:
Lock Region type
5 Region ID
__db.005 Region name
0x7fc142d1c000 Original region address
0x7fc142d1c000 Region address
0x7fc142d1c138 Region primary address
0 Region maximum allocation
0 Region allocated
Region allocations: 3006 allocations, 0 failures, 0 frees, 1 longest
Allocations by power-of-two sizes:
1KB 3002
2KB 0
4KB 1
8KB 0
16KB 0
32KB 2
64KB 1
128KB 0
256KB 0
512KB 0
1024KB 0
REGION_JOIN_OK Region flags
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Lock region parameters:
32792 Lock region region mutex [0/28 0% 18243/140468027311840]
1031 locker table size
1031 object table size
824 obj_off
73640 locker_off
0 need_dd
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Lock conflict matrix:
0 0 0 0 0 0 0 0 0
0 0 1 0 1 0 1 0 1
0 1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0 0
0 1 1 0 0 0 0 1 1
0 0 1 0 0 0 0 0 1
0 1 1 0 0 0 0 1 1
0 0 1 0 1 0 1 0 0
0 1 1 0 1 1 1 0 1
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Locks grouped by lockers:
Locker Mode Count Status ----------------- Object ---------------
42 dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
42 READ 1 HELD md.bdbxml:secondary_ handle 2
45 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
46 dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
46 READ 1 HELD md.bdbxml:secondary_ handle 4
49 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
4a dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
4a READ 1 HELD md.bdbxml:secondary_ handle 6
4d dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
4e dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
4e READ 1 HELD md.bdbxml:secondary_ handle 8
51 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
52 dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
52 READ 1 HELD md.bdbxml:secondary_ handle 10
55 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
56 dd= 0 locks held 2 write locks 0 pid/thread 19176/139654678157040
56 READ 1 HELD md.bdbxml:secondary_ handle 12
56 READ 6 HELD md.bdbxml:secondary_ handle 0
59 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
5d dd= 0 locks held 1 write locks 0 pid/thread 19176/139654678157040
5d READ 1 HELD md.bdbxml:secondary_ handle 14
60 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
61 dd= 0 locks held 2 write locks 0 pid/thread 19176/139654678157040
61 READ 1 HELD md.bdbxml:secondary_ handle 16
61 READ 2 HELD md.bdbxml:secondary_ handle 0
64 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
95 dd= 0 locks held 2 write locks 0 pid/thread 19176/139654678157040
95 READ 1 HELD md.bdbdb:md.db handle 2
95 READ 1 HELD md.bdbdb:md.db handle 0
98 dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
99 dd= 0 locks held 2 write locks 0 pid/thread 19176/139654678157040
99 READ 1 HELD compMd.bdbdb:compMd.bdb handle 2
99 READ 1 HELD compMd.bdbdb:compMd.bdb handle 0
9c dd= 0 locks held 0 write locks 0 pid/thread 19176/139654678157040
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Locks grouped by object:
Locker Mode Count Status ----------------- Object ---------------
61 READ 1 HELD md.bdbxml:secondary_ handle 16
4a READ 1 HELD md.bdbxml:secondary_ handle 6
46 READ 1 HELD md.bdbxml:secondary_ handle 4
42 READ 1 HELD md.bdbxml:secondary_ handle 2
56 READ 6 HELD md.bdbxml:secondary_ handle 0
61 READ 2 HELD md.bdbxml:secondary_ handle 0
5d READ 1 HELD md.bdbxml:secondary_ handle 14
56 READ 1 HELD md.bdbxml:secondary_ handle 12
52 READ 1 HELD md.bdbxml:secondary_ handle 10
4e READ 1 HELD md.bdbxml:secondary_ handle 8
95 READ 1 HELD md.bdbdb:md.db handle 0
95 READ 1 HELD md.bdbdb:md.db handle 2
99 READ 1 HELD compMd.bdbdb:compMd.bdb handle 0
99 READ 1 HELD compMd.bdbdb:compMd.bdb handle 2

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Servlets (servlet-bucket)
Number of Requests: 602 (100.00%)
Number of Invocations: 1629 ( 18.63%)
Latency: 0.0000 0.0228 ( 0.01%)
Function Processing Time: 0.2277 370.9337 ( 99.23%)
Total Response Time: 0.2277 370.9564 ( 99.24%)
Non-cached responses (file-bucket)
Number of Requests: 264 ( 43.85%)
Number of Invocations: 264 ( 3.02%)
Latency: 0.0000 0.0011 ( 0.00%)
Function Processing Time: 0.0002 0.0609 ( 0.02%)
Total Response Time: 0.0002 0.0620 ( 0.02%)
Cache Bucket (cache-bucket)
Number of Requests: 0 ( 0.00%)
Number of Invocations: 0 ( 0.00%)
Latency: 0.0000 0.0000 ( 0.00%)
Function Processing Time: 0.0000 0.0000 ( 0.00%)
Total Response Time: 0.0000 0.0000 ( 0.00%)
Default Bucket (default-bucket)
Number of Requests: 602 (100.00%)
Number of Invocations: 6849 ( 78.35%)
Latency: 0.0000 0.0213 ( 0.01%)
Function Processing Time: 0.0000 0.0726 ( 0.02%)
Total Response Time: 0.0000 0.0939 ( 0.03%)

Has any one had problem like this, plz share to resolve this issue.

Why local file destype does not appear in the parameter form ?

Hi,
There is a Destype option Local File but it does not appear in the list for Destype in the Parameter form.Why?
Even file is not working & the reports server is getting hanged if i specify the destype as file & a valid file name & format is given.
Print option from the app server is also not working, i mean remote printing.
My App server machine can see my local printer, but when i give the print share name or literally five\\machine name..printername then too print option is not working.
Thanks
Mahesh

Hi Shaun,
I'am using 9iDS & the reports documentation says that Local File DesType Option is valid for rwclient & rwservlet.
When your specify in the command line option it works, no issues but in web reports where i get the parameter form Destype list does not contain Local File Option.
For web reports i use rwservlet.
i mean to say my url is something like this
http://oracle.guru:8888/reports/rwservlet?report=abc.rdf&userid=a/b@c&destype=cache&paramform=yes&server=myserver
one more peculiar thing, i have reported it on Metalink.
As you can see in the above URL i have given an argument of destype=cache, if i do not give this then my parameter for will not come up!!!, why should i give a destype for the parameter form to be displayed?
Ok coming to my current problem..
in 9iDS Reports is Local File supported? i.e. when i give a URL like above(My parameter form has system & user parameters including DesType,DesName & DesFormat).
coming to the file option in DesType.
In my parameter form if i select Destype as File & give a valid file name & a valid Desformat the report server hangs i mean there is no activity on the client & after this any report requests from any other clients is not responded by the Reports Server.
When i check in the performance monitor of my Reports Server the CPU Utilization will be constant at 100%
Thanks
Mahesh

Env 3 not compatible?

Hello,
I have an env 3, and with my mac, it doesn't show up on the desktop when I connect it. I started using I sync, and it found my phone via bluetooth, but now says "Isync cannot sync with this device." Why? Is there a different way to do this?
Please advise!

with my mac, it doesn't show up on the desktop when I connect it
Via USB I presume? Does the phone support USB Mass Storage mode? If so, you may need to turn it on in the phone menus somewhere.
I started using I sync, and it found my phone via bluetooth, but now says "Isync cannot sync with this device." Why?
Because LG have not made the Env 3 compatible with iSync. Unfortunately, LG don't seem to care much for the industry standard syncing protocols iSync uses, or for Mac users.
The software linked to below supports some LG phones, but not the Env 3 it seems. It may be worth contacting the makers to ask if support is coming:
http://www.novamedia.de/en/mac-fonesync-lg.html

Why increase db env cache not improve random access performance?

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