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PERF: Optimize backfill query to prevent statement timeouts #1066

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merged 1 commit into from
Jan 14, 2025
Merged

PERF: Optimize backfill query to prevent statement timeouts #1066

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18 changes: 10 additions & 8 deletions db/migrate/20250114160417_backfill_topic_embeddings.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -6,16 +6,18 @@ def up
loop do
count = execute(<<~SQL).cmd_tuples
INSERT INTO ai_topics_embeddings (topic_id, model_id, model_version, strategy_id, strategy_version, digest, embeddings, created_at, updated_at)
SELECT source.*
FROM ai_topic_embeddings source
WHERE NOT EXISTS (
SELECT 1
FROM ai_topics_embeddings target
WHERE target.model_id = source.model_id
AND target.strategy_id = source.strategy_id
AND target.topic_id = source.topic_id
SELECT source.*
FROM (
SELECT old_table.*
FROM ai_topic_embeddings old_table
LEFT JOIN ai_topics_embeddings target ON (
target.model_id = old_table.model_id AND
target.strategy_id = old_table.strategy_id AND
target.topic_id = old_table.topic_id
)
WHERE target.topic_id IS NULL
LIMIT 10000
) source
SQL

break if count == 0
Expand Down
20 changes: 11 additions & 9 deletions db/migrate/20250114160446_backfill_post_embeddings.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -7,17 +7,19 @@ def up

loop do
count = execute(<<~SQL).cmd_tuples
INSERT INTO ai_posts_embeddings (post_id, model_id, model_version, strategy_id, strategy_version, digest, embeddings, created_at, updated_at)
SELECT source.*
FROM ai_post_embeddings source
WHERE NOT EXISTS (
SELECT 1
FROM ai_posts_embeddings target
WHERE target.model_id = source.model_id
AND target.strategy_id = source.strategy_id
AND target.post_id = source.post_id
INSERT INTO ai_posts_embeddings (post_id, model_id, model_version, strategy_id, strategy_version, digest, embeddings, created_at, updated_at)
SELECT source.*
FROM (
SELECT old_table.*
FROM ai_post_embeddings old_table
LEFT JOIN ai_posts_embeddings target ON (
target.model_id = old_table.model_id AND
target.strategy_id = old_table.strategy_id AND
target.post_id = old_table.post_id
)
WHERE target.post_id IS NULL
LIMIT 10000
) source
SQL

break if count == 0
Expand Down
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