as far as I can see estimation of "rows" is very wrong I do think it's
mysql bug, I suggest you rebuild all indexes and run analyze on
tables.
On 4/26/07, Jesse Vincent <[EMAIL PROTECTED]> wrote:
That looks suspiciously like the problem I'd been talking to you about
before, Todd.
On Apr 25, 2007, at 11:27 PM, Philip Kime wrote:
I know I asked this before but I've been swamped and lost track of there the
discussion got to.
RT 3.6.3, Mysql 5.0.27. The main ticket search page is really slow to load,
typically 45 seconds, sometimes longer. Problem query and explain below.
It's starting to become a problem for us. Seems that the first row of the
explain output is the guilty one. Rows_examined is absurdly high.
PK
# Query_time: 45 Lock_time: 0 Rows_sent: 290 Rows_examined: 65256162
SELECT DISTINCT main.* FROM Users main , Principals Principals_1,
CachedGroupMembers CachedGroupMembers_2, Groups Groups_3, ACL ACL_4 WHERE
((ACL_4.PrincipalType = Groups_3.Type)) AND ((ACL_4.RightName =
'OwnTicket')) AND ((CachedGroupMembers_2.MemberId = Principals_1.id)) AND
((Groups_3.id = CachedGroupMembers_2.GroupId)) AND ((Principals_1.Disabled =
'0')) AND ((Principals_1.PrincipalType = 'User')) AND ((Principals_1.id !=
'1')) AND ((main.id = Principals_1.id)) AND ((ACL_4.ObjectType =
'RT::Queue') OR (ACL_4.ObjectType = 'RT::System')) AND ((Groups_3.Domain =
'RT::Queue-Role') OR (Groups_3.Domain = 'RT::System-Role')) ORDER BY
main.RealName ASC;
*************************** 1. row ***************************
id: 1
select_type: SIMPLE
table: main
type: range
possible_keys: PRIMARY
key: PRIMARY
key_len: 4
ref: NULL
rows: 673
Extra: Using where; Using temporary; Using filesort
*************************** 2. row ***************************
*************************** 2. row ***************************
id: 1
select_type: SIMPLE
table: Principals_1
type: eq_ref
possible_keys: PRIMARY
key: PRIMARY
key_len: 4
ref: rt3.main.id
rows: 1
Extra: Using where; Distinct
*************************** 3. row ***************************
id: 1
select_type: SIMPLE
table: CachedGroupMembers_2
type: ref
possible_keys: DisGrouMem,SHRD_CGM1
key: SHRD_CGM1
key_len: 5
ref: rt3.main.id
rows: 1
Extra: Using where; Using index; Distinct
*************************** 4. row ***************************
id: 1
select_type: SIMPLE
table: ACL_4
type: range
possible_keys: ACL1
key: ACL1
key_len: 54
ref: NULL
rows: 77
Extra: Using where; Using index; Distinct
*************************** 5. row ***************************
id: 1
select_type: SIMPLE
table: Groups_3
type: eq_ref
possible_keys: PRIMARY,Groups1,Groups2
key: PRIMARY
key_len: 4
ref: rt3.CachedGroupMembers_2.GroupId
rows: 1
Extra: Using where; Distinct
--
Philip Kime
NOPS Systems Architect
310 401 0407
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--
Best regards, Ruslan.
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