V$BH View no of index blocks...help

hello guys,
i have queried the view V$BH and it seems that there are 0-36 classes of block present.. can one help me with the class of the index blocks that are present in the buffer cache....

Check this link,
www.juliandyke.com/Internals/BlockClasses.html
HTH
Aman....

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Hi there
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How should be set Index block size in Warehouse databases?

Hi,
We have Warehouse database.
I cannot find out index block size.
1. Where can I get know our index block sizes?
2. How can I enlarge index block sizes? Is it related with tablespace?
After your suggestion do I need increase or set buffer cache keep pool according to block sizes? 2K, 4K, 8K, 16K and 32K can be specified?
could you help me please?
thanks and regards,

See the BLOCK_SIZE column in DBA_TABLESPACES.
You can't "increase" the block size. You'd have
a) to allocate DB_xK_cache_size for the new "x"K block size
b) create a new tablespace explicitly specifying the block size in the CREATE TABLESPACE command
c) rebuild your indexes into the new tablespace.
Indexes created in a tablespace with a larger block size have more entries in each block.
You may get better performance.
You may get worse performance.
You may see no difference in performance.
You may encounter bugs.
"increasing block size" is an option to be evaluated and tested thoroughly. It is not, per se, a solution.
Hemant K Chitale
http://hemantoracledba.blogspot.com

Contention on index block splits consuming significant database time

Hi Guys,
can anybody suggest on how to remove Contention on index block splits,this is giving so many issues on my production DB,the CPU usage shots up and application hangs for few minutes.
DB is 10.2.0.3 and OS is IBM AIX 5.3

I found this.. it might be useful
One possibility is that this is caused by shared CBC latching peculiarities:
1) during normal selects your index root block can be examined under a
shared cache buffers chains latch.
So as long as everybody is only reading the index root block, everybody can
do it concurrently (without pinning the block). The "current holder count"
in the CBC latch structure is just increased by one for every read only
latch get and decreased by one on every release. 0 value means that nobody
has this latch taken currently.
Nobody has to wait for others for reading index root block in all read only
case. That greatly helps to combat hot index root issues.
2) Now if a branch block split happens a level below the root block, the
root block has to be pinned in exclusive mode for reflecting this change in
it. In order to pin a block you need to get the corresponding CBC latch in
exclusive mode.
If there are already a bunch of readers on the latch, then the exclusive
latch getter will just flip a bit in the CBC latch structure - stating it's
interest for exclusive get.
Every read only latch get will check for this bit, if it's set, then the
getters will just spin instead, waiting this bit to be cleared (they may
yield or sleep immediately as well, I haven't checked). Now the exclusive
getter has to spin/wait until all the shared getters have released the latch
and the "current holder count" drops to zero. Once it's zero (and the getter
manager to get on to CPU) it can get the latch, do its work and release the
latch.
During all that time starting from when the "exclusive interest" bit was
set, nobody could access this indexes root block except the processes which
already had the latch in shared mode. Depending on latch spin/sleep strategy
for this particular case and OSD implementation, this could mean that all
those "4000 readers per second" start just spinning on that latch, causing
heavy spike in CPU usage and they all queue up.
How do diagnose that:
You could sample v$latch_misses to see whether the number of "kcbgtcr:
kslbegin shared" nowaitfails/sleeps counter takes an exceptional jump up
once you observe this hiccup.
How to fix that once diagnosed:
The usual stuff, like partitioning if possible or creating a single table
hash cluster instead.
If you see that the problem comes from excessive spinning, think about
reducing the spinning overhead (by reducing spincount for example). This
could affect your other database functions though..
If you can't do the above - then if you have off-peak time, then analyse
indexes (using treedump for start) and if you see a block split coming in a
branch below root block, then force the branch block to split during
off-peak time by inserting carefully picked values into the index tree,
which go exactly in the range which cause the proper block to split. Then
you can just roll back your transaction - the block splits are not rolled
back nor coalesced somehow, as this is done in a separate recursive
transaction.
And this
With indexes, the story is more complicated since you can't just insert a
row into any free block available like with tables. Multiple freelists with
tables help us to spread up inserts to different datablocks, since every
freelist has its distinct set of datablocks in it. With indexes, the
inserted key has to go exactly to the block where the structure of b?tree
index dictates, so multiple freelists can't help to spread contention here.
When any of the index blocks has to split, a new block has to be allocated
from the freelist (and possibly unlinked from previous location in index),
causing an update to freelist entry in segment header block. Now if you had
defined multiple freelists for your segment, they'd still remain in the
single segment header block and if you'd have several simultaneous block
splits, the segment header would become the bottleneck.
You could relieve this by having multiple freelist groups (spreading up
freelists into multiple blocks after segment header), but this approach has
it's problems as well - like a server process which maps to freelist group 1
doesn't see free blocks in freelist group 2, thus possibly wasting space in
some cases...
So, if you have huge contention on regular index blocks, then you should
rethink the design (avoid right hand indexes for example), or physical
design (partition the index), increasing freelists won't help here.
But if you have contention on index segment's header block because of block
splits/freelist operations, then either partition the index or have multiple
freelist groups, adding freelists again won't help here. Note that adding
freelist groups require segment rebuild.

Index Block Splits

How we can reduce or tune index block splits.. I mean wait event for leaf node splits, a session might be waiting to read the block which is getting split. And i guess index block split is natural we cannot avoid it, like for example ginger value has to be inserted between finger and hello, so to insert ginger value oracle will split the block into 2 by inserting ginger and moving hello to another block.. please help me or explain me experts

842638 wrote:
How we can reduce or tune index block splits.. I mean wait event for leaf node splits, a session might be waiting to read the block which is getting split. And i guess index block split is natural we cannot avoid it, like for example ginger value has to be inserted between finger and hello, so to insert ginger value oracle will split the block into 2 by inserting ginger and moving hello to another block.. please help me or explain me expertsThe block splits would be happening and if I remember correctly, there are going to be two types of it, 50-50 split and 90-10 split, both would depend on that the range of the data that you are inserting. I would suggest that you read Richard Foote's presentation [url http://richardfoote.files.wordpress.com/2007/12/index-internals-rebuilding-the-truth.pdf] Index Internals to know more about all this.
Aman....

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Hi,
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Message was edited by:
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buffer tsn: 11 rdba: 0x1684d120 (90/315680)
========> 0x1684d120 (1)
header address 4403265988=0x1067481c4
========> 0x1067481c4 (2)
*** SERVICE NAME:(SYS$USERS) 2009-08-04 04:37:36.335
*** SESSION ID:(14234.24426) 2009-08-04 04:37:36.335
Start dump data blocks tsn: 11 file#: 90 minblk 315680 maxblk 315680
buffer tsn: 11 rdba: 0x1684d120 (90/315680)
========> 0x1684d120 (1)
scn: 0x0324.dda9ec3d seq: 0x01 flg: 0x04 tail: 0xec3d0601
frmt: 0x02 chkval: 0xeb2a type: 0x06=trans data
Hex dump of block: st=0, typ_found=1
Block header dump: 0x1684d120
Object id on Block? Y
seg/obj: 0x7ca10 csc: 0x324.dda9ec3d itc: 17 flg: O typ: 2 - INDEX
     fsl: 0 fnx: 0x1684cf72 ver: 0x01
Itl           Xid                  Uba         Flag Lck        Scn/Fsc
Leaf block dump
===============
header address 4403265988=0x1067481c4
========> 0x1067481c4 (2)
kdxcolev 0
KDXCOLEV Flags = - - -
kdxcolok 0
kdxcoopc 0x90: opcode=0: iot flags=I-- is converted=Y
kdxconco 2
kdxcosdc 5
kdxconro 0
kdxcofbo 36=0x24
kdxcofeo 7672=0x1df8
kdxcoavs 7636
kdxlespl 0
kdxlende 0
kdxlenxt 373579108=0x16445d64
kdxleprv 377801347=0x1684ca83
kdxledsz 0
kdxlebksz 7672
----- end of leaf block dump -----Thanks,
Daniel

Hi user646745
You didn't say why you need to do index block dump ?
Also take are that block structures and dumps some time are different from a ver to ver it 9i and 10g. Unless you now what exectaly you are looking for
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Dumping Index Blocks

Hi,
I'm trying to dump index blocks but the generated trace file has an error.
how can I resolve this issue?
Following is what I've done and got:
SQL> SELECT object_id FROM USER_objects WHERE object_name = 'NAME_5'
OBJECT_ID
71142
SQL> ALTER SESSION SET EVENTS 'immediate trace name treedump level 71142' ;
Trace file e:\oracle\diag\rdbms\ora11g\ora11g\trace\ora11g_ora_3700.trc
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Windows Server 2003 Version V5.2 Service Pack 2
----- begin tree dump
2010-04-08 01:21:53.043: [ OCROSD]utgdv:11:could not read reg value ocrmirrorconfig_loc os error= The system could not find the environment option that was entered.
2010-04-08 01:21:53.059: [ OCROSD]utgdv:11:could not read reg value ocrmirrorconfig_loc os error= The system could not find the environment option that was entered.
leaf: 0x18057e4 25188324 (0: nrow: 10 rrow: 10)
----- end tree dump

ahb72 wrote:
SQL> SELECT object_id FROM USER_objects WHERE object_name = 'NAME_5'
OBJECT_ID
71142
SQL> ALTER SESSION SET EVENTS 'immediate trace name treedump level 71142' ;
Trace file e:\oracle\diag\rdbms\ora11g\ora11g\trace\ora11g_ora_3700.trc
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Windows Server 2003 Version V5.2 Service Pack 2
----- begin tree dump
2010-04-08 01:21:53.043: [ OCROSD]utgdv:11:could not read reg value ocrmirrorconfig_loc os error= The system could not find the environment option that was entered.
2010-04-08 01:21:53.059: [ OCROSD]utgdv:11:could not read reg value ocrmirrorconfig_loc os error= The system could not find the environment option that was entered.
leaf: 0x18057e4 25188324 (0: nrow: 10 rrow: 10)
----- end tree dump
If your table has 10 rows, then this leaf block is the entire index and the two error lines are probably irrelevant.
Create a table with a few thousand rows and see if the errors appear for every line in the tree dump, or just once at the start. If the former than you can probably live with it.
Regards
Jonathan Lewis

V$BH View no of index blocks...help

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