|
Hi All, I’m tuning my LDAP DB (BDB type). I’m reading at http://www.openldap.org/doc/admin24/tuning.html#Berkeley%20DB%20Cache
At 21.4.1.1 #(Number
of hash buckets + number of overflow pages + number of duplicate pages) * page
size / 2 #The objectClass
index for my example database is 5.9MB and uses 3 hash buckets and 656
duplicate pages. So: # ( 3
+ 656 ) * 4KB / 2 =~ 1.3MB. #With only
this index enabled, I'd figure at least a 4MB cache for this backend. (Of
course you're using a single cache shared among all of the database files, so
the cache pages will most likely #get used for something other than what you
accounted for, but this gives you a fighting chance.)” I understand
that: with each index ( in this case only objectclass is indexed), we must
calculate their cache size individually and sum every them. (1) - I can
specify “Number of hash buckets” & “Cache Size “
(2)by command Shell>
db_stat-4.4 -m | head -n 25 32771 Number
of hash buckets used for page location Pool
file: <index>.bdb <number> page
size -
I
can specify “Number of overflow pages” & “Number of
duplicate pages” by command Shell>
db_stat-4.4 -d *.bdb (3) 0 Number
of tree duplicate page 0 Number
of tree overflow pages (1)
Did
I understand right? (2)
Which
page size will we use, some of index file use 4K page size, others use 16K page
size? (3)
Do
must I run for each index or *.bdb is still ok? Could
anyone help me? This chapter is not clearly huh? Thank for reading |