maria-developers team mailing list archive
Mailing list archive
Query cache information plugin - MDEV-4516
Hi guys i'm reading query cache code, and i have some doubts...
at line: 1412 (Query_cache::store_query)
we have this comment:
/* PROTOCOL_LOCAL results are not cached. */
what's PROTOCOL_LOCAL ? it's the unix socket? windows pipe? embedded?
memcache? mysql? another thing like this? or it's the internal mariadb
source running queries?
2)the query_size=0 (MDEV-4516)
i was reading at line 1680
if (is_disabled() || thd->locked_tables_mode ||
thd->variables.query_cache_type == 0)
and line : 1694
DBUG_ASSERT(query_cache_size != 0); // otherwise cache would be
why it's isn't used in query_cache_information plugin?
*check that in line 1680 it test the "query_cache_type" too, *
*in MDEV-4516 report about size=0 we didn't tested this case!!!*
3) i was at line 1886:
long %d, 4.1: %d, bin_proto: %d, more results %d, pkt_nr: %d, \
CS client: %u, CS result: %u, CS conn: %u, limit: %lu, TZ: 0x%lx, \
sql mode: 0x%llx, sort len: %lu, conncat len: %lu, div_precision: %lu, \
def_week_frmt: %lu, in_trans: %d, autocommit: %d",
is this the "primary key" of the query cache!?!?!?!?!?!?!
could we use a sha1 or another "primary key" method (index  of the query
in cache + '';'+ 5 bytes of a hash key to compare if the index still with
the same query)
to easly show query entry "number", and allow a "delete from
query_cache_information where key=xxx" function?
at line 1938 we have this maybe the query position on cache ("primary key
of query cache")?:
DBUG_PRINT("qcache", ("Query have result 0x%lx", (ulong) query));
there's some more ideas about query cache information plugin at MDEV-4571,
if anyone could read it =)
well that's all =]