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http://asktom.oracle.com/pls/ask/f?p=4950:8:11052001865409674410::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:1229436447262

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Cache buffers LRU chain latch: µ±Óû§½ø³ÌÒªËÑË÷buffer cacheÖаüÀ¨ËùÓÐ dirty blocksµÄLRU (least recently used) Á´Ê±Ê¹ÓøÃÖÖlatch¡£

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Blocks in the buffer cache are placed on linked lists(cache buffer chains) which hang off a hash table.
The hash chain that a block is placed on is based on the DBA and CLASS of the block. Each hash chain is
protected by a single child latch. Processes need to get the relevant latch to allow them the scan a hash chain for a buffer so that the linked list does not change underneath them.

Contention for these latches can be caused by:

- Very long buffer chains.
- very very heavy access to the same blocks.

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SQL> select count(*) from v$latch_children where misses>0 and name='cache buffers chains';

COUNT(*)
----------
2048

SQL>select addr,name,misses from v$latch_children where misses>0 and name='cache buffers chains' order by misses desc;
ADDR NAME MISSES
-------- ---------------------------------------------------------------- ----------
..........
69CC28BC cache buffers chains 1591
69A3CF1C cache buffers chains 1591
69CBDDFC cache buffers chains 1589
69B92DFC cache buffers chains 1586
69C5DEBC cache buffers chains 1585
69AB0354 cache buffers chains 1585
69A70F9C cache buffers chains 1585
69A81F54 cache buffers chains 1585
...........

SQL> select bh.addr,obj.name obj_name,bh.tch touch from x$bh bh,sys.file$ f,v$datafile fl,sys.obj$ obj,sys.ts$ ts
2 where fl.file#=f.file# and bh.file#=fl.file# and obj.dataobj#=bh.obj and bh.ts#=ts.ts#
3 and bh.HLADDR='69CC28BC' and bh.tch>0 order by bh.tch desc;

ADDR OBJ_NAME TOUCH
-------- ------------------------------ ----------
B6FD3078 IDX_GCTID_IUID_GM634 24
B6FD3078 REG_LOG 8
B6FD2F9C AGENT_CARD_TYPE 7
B6FD3078 RESELLER_AGENTCARD_PRICE 6
B6FD3078 RESELLER_LOG 6
B6FD3078 IDX_ACL_AGENTID_LOGTIME 6
B6FD3078 RESELLER_LOG 6
.............

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SQL> select COUNT(*) from x$bh bh,sys.file$ f,v$datafile fl,sys.obj$ obj,sys.ts$ ts
2 where fl.file#=f.file# and bh.file#=fl.file# and obj.dataobj#=bh.obj and bh.ts#=ts.ts#
3 and bh.HLADDR='69CC28BC' and bh.tch>0;

COUNT(*)
----------
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Under 8.0, the default was next_prime(db_block_buffers/4), and the
number of _db_block_hash_latches was 1:1 with the number of buckets.
Under 8i, the world changed a lot. The default number of hash buckets
is 2 * db_block_buffers, but the latches work differently. It's
really not necessary to have one latch per hash chain, so, Oracle made
them a pooled resource. When you need to interrogate a hash chain,
you grab a latch from the pool and assign it to a hash chain. That
prevents anyone else from modifying the chain or it's contents while
your process is using it. So, in 8i, the size of the latch pool is
dynamic but is set to 1024 for most cases. It's smaller for very
small buffer caches and larger for very large buffer caches. The
formula is:
if (db_block_buffers < 2052) then
db_block_hash_latches = 2^trunc(log(2,db_block_buffers - 4) - 1)
else if(2052 =< db_block_buffers <= 131075) then
db_block_hash_latches = 1024
else if(db_block_buffers > 131075)
db_block_hash_latches = 2^trunc(log(2,db_block_buffers - 4) - 6)
end if

So, under 8i, you probably don't need to touch _db_block_hash_buckets,
as 2 * db_block_buffers is almost certainly more than adequate. And
unless you're dealing huge numbers of concurrent users and a
relatively small buffer cache, you probably don't need to mess with
_db_block_hash_latches, either.

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db_block_hash_latches = 2^trunc(log(2,DB_CACHE_SIZE - 4) - 6)

SQL> show parameter db_cache_size;

NAME TYPE VALUE
------------------------------------ -------------------------------- ------------------------------
db_cache_size big integer 1073741824

SQL>select name,
value,
decode(isdefault, 'TRUE', 'Y', 'N') as "Default",
decode(ISEM, 'TRUE', 'Y', 'N') as SesMod,
decode(ISYM, 'IMMEDIATE', 'I', 'DEFERRED', 'D', 'FALSE', 'N') as SysMod,
decode(IMOD, 'MODIFIED', 'U', 'SYS_MODIFIED', 'S', 'N') as Modified,
decode(IADJ, 'TRUE', 'Y', 'N') as Adjusted,
description
from (--GV$SYSTEM_PARAMETER
select x.inst_id as instance,
x.indx + 1,
ksppinm as name,
ksppity,
ksppstvl as value,
ksppstdf as isdefault,
decode(bitand(ksppiflg / 256, 1), 1, 'TRUE', 'FALSE') as ISEM,
decode(bitand(ksppiflg / 65536, 3), 1, 'IMMEDIATE', 2, 'DEFERRED', 'FALSE') as ISYM,
decode(bitand(ksppstvf, 7), 1, 'MODIFIED', 'FALSE') as IMOD,
decode(bitand(ksppstvf, 2), 2, 'TRUE', 'FALSE') as IADJ,
ksppdesc as description
from x$ksppi x,
x$ksppsv y
where x.indx = y.indx
and substr(ksppinm, 1, 1) = '_'
and x.inst_id = USERENV('Instance'))
where name = '_db_block_hash_latches'
order by name;

NAME VALUE
------------------------------ ---------------
_db_block_hash_latches 2048

SQL> select power(2,trunc(log(2,1073741824 - 4) - 6)) from dual;

POWER(2,TRUNC(LOG(2,1073741824-4)-6))
-------------------------------------
8388608

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