لقد أكملنا استيراد منشورات المستخدمين من برنامجنا الحالي إلى Discourse، ولاحظنا أن بعض صفحات المستخدمين تستغرق وقتًا طويلاً جدًا في التحميل (عدة ثوانٍ)، ويبدو أن السبب هو استعلامات بطيئة. كيف يمكننا استكشاف هذه المشكلة وتحديد الاختناق؟
إليك بعض المعلومات الإضافية حول إعدادنا:
مواصفات الخادم: 8 أنوية، 32 جيجابايت من ذاكرة الوصول العشوائي، تخزين NVMe SSD مع ZFS
يحتوي المنتدى على حوالي 25 مليون منشور. معظم هذه المنشورات هي محادثات خاصة، بينما يبلغ عدد المنشورات العامة حوالي 10.5 مليون.
لدينا عدد من المواضيع الضخمة (نحن موقع مخصص للكتابة، لذا تميل القصص الفردية إلى التطور ببطء مع مرور الوقت، مما يؤدي إلى تراكم العديد من المنشورات)، وتصل إلى آلاف المنشورات، مما قد يساهم في المشكلة، لكنني لا أعرف كيفية تأكيد ذلك.
إليك أحد الاستعلامات التي تبدو أنها تسبب المشكلة - لقد رأيت وقت تنفيذها يتجاوز 5000 مللي ثانية في محلل الحمل المدمج:
SELECT "topic_links"."id" AS t0_r0, "topic_links"."topic_id" AS t0_r1, "topic_links"."post_id" AS t0_r2, "topic_links"."user_id" AS t0_r3, "topic_links"."url" AS t0_r4, "topic_links"."domain" AS t0_r5, "topic_links"."internal" AS t0_r6, "topic_links"."link_topic_id" AS t0_r7, "topic_links"."created_at" AS t0_r8, "topic_links"."updated_at" AS t0_r9, "topic_links"."reflection" AS t0_r10, "topic_links"."clicks" AS t0_r11, "topic_links"."link_post_id" AS t0_r12, "topic_links"."title" AS t0_r13, "topic_links"."crawled_at" AS t0_r14, "topic_links"."quote" AS t0_r15, "topic_links"."extension" AS t0_r16, "topics"."id" AS t1_r0, "topics"."title" AS t1_r1, "topics"."last_posted_at" AS t1_r2, "topics"."created_at" AS t1_r3, "topics"."updated_at" AS t1_r4, "topics"."views" AS t1_r5, "topics"."posts_count" AS t1_r6, "topics"."user_id" AS t1_r7, "topics"."last_post_user_id" AS t1_r8, "topics"."reply_count" AS t1_r9, "topics"."featured_user1_id" AS t1_r10, "topics"."featured_user2_id" AS t1_r11, "topics"."featured_user3_id" AS t1_r12, "topics"."deleted_at" AS t1_r13, "topics"."highest_post_number" AS t1_r14, "topics"."like_count" AS t1_r15, "topics"."incoming_link_count" AS t1_r16, "topics"."category_id" AS t1_r17, "topics"."visible" AS t1_r18, "topics"."moderator_posts_count" AS t1_r19, "topics"."closed" AS t1_r20, "topics"."archived" AS t1_r21, "topics"."bumped_at" AS t1_r22, "topics"."has_summary" AS t1_r23, "topics"."archetype" AS t1_r24, "topics"."featured_user4_id" AS t1_r25, "topics"."notify_moderators_count" AS t1_r26, "topics"."spam_count" AS t1_r27, "topics"."pinned_at" AS t1_r28, "topics"."score" AS t1_r29, "topics"."percent_rank" AS t1_r30, "topics"."subtype" AS t1_r31, "topics"."slug" AS t1_r32, "topics"."deleted_by_id" AS t1_r33, "topics"."participant_count" AS t1_r34, "topics"."word_count" AS t1_r35, "topics"."excerpt" AS t1_r36, "topics"."pinned_globally" AS t1_r37, "topics"."pinned_until" AS t1_r38, "topics"."fancy_title" AS t1_r39, "topics"."highest_staff_post_number" AS t1_r40, "topics"."featured_link" AS t1_r41, "topics"."reviewable_score" AS t1_r42, "topics"."image_upload_id" AS t1_r43, "posts"."id" AS t2_r0, "posts"."user_id" AS t2_r1, "posts"."topic_id" AS t2_r2, "posts"."post_number" AS t2_r3, "posts"."raw" AS t2_r4, "posts"."cooked" AS t2_r5, "posts"."created_at" AS t2_r6, "posts"."updated_at" AS t2_r7, "posts"."reply_to_post_number" AS t2_r8, "posts"."reply_count" AS t2_r9, "posts"."quote_count" AS t2_r10, "posts"."deleted_at" AS t2_r11, "posts"."off_topic_count" AS t2_r12, "posts"."like_count" AS t2_r13, "posts"."incoming_link_count" AS t2_r14, "posts"."bookmark_count" AS t2_r15, "posts"."score" AS t2_r16, "posts"."reads" AS t2_r17, "posts"."post_type" AS t2_r18, "posts"."sort_order" AS t2_r19, "posts"."last_editor_id" AS t2_r20, "posts"."hidden" AS t2_r21, "posts"."hidden_reason_id" AS t2_r22, "posts"."notify_moderators_count" AS t2_r23, "posts"."spam_count" AS t2_r24, "posts"."illegal_count" AS t2_r25, "posts"."inappropriate_count" AS t2_r26, "posts"."last_version_at" AS t2_r27, "posts"."user_deleted" AS t2_r28, "posts"."reply_to_user_id" AS t2_r29, "posts"."percent_rank" AS t2_r30, "posts"."notify_user_count" AS t2_r31, "posts"."like_score" AS t2_r32, "posts"."deleted_by_id" AS t2_r33, "posts"."edit_reason" AS t2_r34, "posts"."word_count" AS t2_r35, "posts"."version" AS t2_r36, "posts"."cook_method" AS t2_r37, "posts"."wiki" AS t2_r38, "posts"."baked_at" AS t2_r39, "posts"."baked_version" AS t2_r40, "posts"."hidden_at" AS t2_r41, "posts"."self_edits" AS t2_r42, "posts"."reply_quoted" AS t2_r43, "posts"."via_email" AS t2_r44, "posts"."raw_email" AS t2_r45, "posts"."public_version" AS t2_r46, "posts"."action_code" AS t2_r47, "posts"."locked_by_id" AS t2_r48, "posts"."image_upload_id" AS t2_r49 FROM "topic_links" INNER JOIN "topics" ON "topics"."id" = "topic_links"."topic_id" AND ("topics"."deleted_at" IS NULL) INNER JOIN "posts" ON "posts"."id" = "topic_links"."post_id" AND ("posts"."deleted_at" IS NULL) WHERE (posts.post_type IN (1,2,3,4)) AND ("topics"."deleted_at" IS NULL) AND (topics.archetype <> 'private_message') AND "topics"."visible" = TRUE AND (topics.category_id IS NULL OR topics.category_id IN (SELECT id FROM categories WHERE NOT read_restricted OR id IN (3,4))) AND "topic_links"."user_id" = 7237 AND "topic_links"."internal" = FALSE AND "topic_links"."reflection" = FALSE AND "topic_links"."quote" = FALSE ORDER BY clicks DESC, topic_links.created_at DESC LIMIT 6
عند مراقبة الخادم أثناء تحميل صفحة مستخدم، يبدو أن استخدام وحدة المعالجة المركزية يرتفع بشكل حاد في عمليات postgresql أثناء تنفيذ الاستعلام. لم أقم بإجراء أي تغييرات في الإعدادات على التثبيت باستثناء إضافة دعم MySQL لعملية الاستيراد. أي نصيحة حول الخطوات التالية ستكون موضع تقدير!
