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problème suivant me donne un mal de tête.MySQL requête cache, requête SQL complexe
J'ai configuré mon serveur MySQL pour utiliser "Query Chaching".
set global query_cache_size = 10000000;
il semble que mon cache de requête fonctionne parce que la sortie de
SHOW STATUS LIKE 'Qcache%';
est la suivante
+-------------------------+----------+
| Variable_name | Value |
+-------------------------+----------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 47223976 |
| Qcache_hits | 6709 |
| Qcache_inserts | 2314 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 365 |
| Qcache_queries_in_cache | 441 |
| Qcache_total_blocks | 960 |
+-------------------------+----------+
mais, nevertheles les éléments suivants (requête complexe, avec sélectionne interne, etc.) ne se cache pas.
Il faut toujours au moins 0,8 secondes pour récupérer les données pour cette requête. Comment puis-je amener mysql à stocker les résultats de cette requête dans son cache?
J'ai essayé d'enlever les sélections internes mais cela n'a pas fait de différence.
SELECT p.id
AS
project_id,
p.code
AS project_code,
p.title
AS project_title,
p.start_date
AS project_start_date,
p.end_date
AS project_end_date,
p.modf
AS project_modf,
(p.budget * (SELECT 1/r.VALUE
FROM exchange_rates r
WHERE r.class_currency_id = p.class_budget_currency_id))
AS
project_budget,
(SELECT z.txt
FROM sys_labels z
WHERE z.id = ps.value_label_id
AND z.lng = 'en')
AS project_status,
(SELECT z.txt
FROM sys_labels z
WHERE z.id = ps.data_label_id
AND z.lng = 'en')
AS project_color,
GROUP_CONCAT(DISTINCT pt.class_topic_id)
AS projects_thematic_area_ids,
u.id
AS project_owner_id
FROM projects AS p
LEFT JOIN projects_thematic_areas AS pt
ON pt.project_id = p.id
LEFT JOIN sys_users AS u
ON u.id = p.owner_uid
LEFT JOIN class_data s
ON s.id = p.class_status_id
LEFT JOIN class_data AS ps
ON ps.id = s.id
LEFT JOIN sys_labels AS prdz1
ON prdz1.id = prd.value_label_id
AND prdz1.lng = 'en'
LEFT JOIN sys_labels AS prdz2
ON prdz2.id = prd.data_label_id
AND prdz2.lng = 'en'
LEFT JOIN projects_locations AS pl
ON pl.project_id = p.id
LEFT JOIN class_data AS l
ON l.id = pl.class_location_id
LEFT JOIN class_data AS r
ON r._lft <= l._lft
AND r._rgt >= l._rgt
AND r._level = 1
AND r.class_id = 5
LEFT JOIN class_data AS c
ON c._lft <= l._lft
AND c._rgt >= l._rgt
AND c._level = 2
AND c.class_id = 10
LEFT JOIN projects_donors AS pd
ON pd.project_id = p.id
LEFT JOIN institutions AS i
ON pd.inst_id = i.id
LEFT JOIN class_data AS ic
ON ic.id = i.class_country_id
LEFT JOIN projects_deliverables AS d
ON d.project_id = p.id
WHERE 1 = 1
AND p.is_del = "f"
AND p.is_active = "t"
GROUP BY p.id
ORDER BY p.modf DESC,
p.code DESC
Toute aide apprechiated ....
Cordialement
J.