Details
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Improvement
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Resolution: Unresolved
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High
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None
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5.3, 5.4.0
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None
Description
When generating a URL, eZ Publish performs 1+n queries, to fetch the link and all the nodes the way up. When the URL is assembled, it is written to cache. When another, similar URL is generated, all
1+n queries are executed again, even if most of the parts are completely identical.
For example, consider the following content structure:
Root
Tests (ezurlalias_ml id: 156)
13124_folder1 (ezurlalias_ml id: 157)
13124_folder2 (ezurlalias_ml id: 158)
13124_article1 (ezurlalias_ml id: 159)
13124_article2 (ezurlalias_ml id: 160)
13124_article3 (ezurlalias_ml id: 161)
13124_article4 (ezurlalias_ml id: 162)
When you access the frontend mainpage, a number of duplicate queries is generated:
... Query SELECT `id`, `link`, `is_alias`, `alias_redirects`, `lang_mask`, `is_original`, `parent`, `text`, `text_md5`, `action` FROM `ezurlalias_ml` WHERE ( `action` = 'eznode:156' AND `is_original` = 1 AND `is_alias` = 0 ) Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '162' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '158' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '157' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '156' Query SELECT * FROM `ezcontentobject_tree` WHERE `node_id` = '155' Query SELECT `id`, `link`, `is_alias`, `alias_redirects`, `lang_mask`, `is_original`, `parent`, `text`, `text_md5`, `action` FROM `ezurlalias_ml` WHERE ( `action` = 'eznode:155' AND `is_original` = 1 AND `is_alias` = 0 ) Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '161' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '158' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '157' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '156' Query SELECT * FROM `ezcontentobject_tree` WHERE `node_id` = '154' Query SELECT `id`, `link`, `is_alias`, `alias_redirects`, `lang_mask`, `is_original`, `parent`, `text`, `text_md5`, `action` FROM `ezurlalias_ml` WHERE ( `action` = 'eznode:154' AND `is_original` = 1 AND `is_alias` = 0 ) Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '160' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '158' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '157' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '156' Query SELECT * FROM `ezcontentobject_tree` WHERE `node_id` = '153' Query SELECT `id`, `link`, `is_alias`, `alias_redirects`, `lang_mask`, `is_original`, `parent`, `text`, `text_md5`, `action` FROM `ezurlalias_ml` WHERE ( `action` = 'eznode:153' AND `is_original` = 1 AND `is_alias` = 0 ) Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '159' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '158' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '157' Query SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '156' ...
Notice all those duplicate SELECTs:
SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '158' SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '157' SELECT `parent`, `lang_mask`, `text` FROM `ezurlalias_ml` WHERE `id` = '156'
Technically this is because the cache is implemented in a simple way as it does not have enough information to clear specific cache.