Eso podría mejorar aún más el rendimiento. No estoy seguro. El filtro para user_id está en la tabla posts, así que no sé cómo interactuaría con el lado de topic_links del join, pero definitivamente vale la pena echarle un vistazo.
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¿Qué nos sugieres que intentemos indexar, los identificadores de usuario?
Vale, déjame explicarlo:
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, "topics"."slow_mode_seconds" AS t1_r44, "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"."deleted_at" IS NULL AND "topics"."id" = "topic_links"."topic_id"
INNER JOIN "posts" ON "posts"."deleted_at" IS NULL AND "posts"."id" = "topic_links"."post_id"
WHERE "posts"."user_id" = 32 AND (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 (20,25,69,83,87,88,89,91,94,95,96,97,99,100))) AND "topic_links"."user_id" = 32 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;
Esta consulta existe para esta sección:
topic_links tiene los siguientes índices:
También tiene la columna user_id:
Según:
Los enlaces que creamos están correctamente vinculados al ID de usuario.
Por lo tanto, lo que tiene sentido aquí es simplemente mejorar el índice:
Nuestra cláusula es ahora:
"topic_links"."user_id" = 32 AND "topic_links"."internal" = FALSE AND "topic_links"."reflection" = FALSE AND "topic_links"."quote" = FALSE
Esto se une en topic_id / post_id.
Así que el índice:
create index idxFaster on topic_links(user_id, clicks desc, created_at desc) where (NOT reflection and NOT quote and NOT internal) include (post_id, topic_id)
Aunque, dado que AR selecciona más de lo necesario aquí, cubrirlo es un tanto inútil, por lo que se puede eliminar la cláusula include.
¿Puedes eliminar todos tus índices extra y ver si idxFaster soluciona el problema para ti?
EDIT
Debería corregir el problema una vez que se fusiona.
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