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b246723d83
Our previous set of indexes for the Message table did not contain anything to optimize queries for all the messages in a topic in an organization where the same topic name might appear in 10,000s of messages in many streams. We add two indexes here to support common queries * A `(recipient_id, upper(subject), id)` index to support "Fetch all messages from a topic" queries. * A `(recipient_id, subject, id)` index to support "Fetch all messages by topic" We use the `DESC NULLS last` on both indexes because we almost always want to query from the "Latest N messages" on a topic, not the "Earliest N messages". These indexes dramatically improve the performance of fetching topic history (which remains not good enough in my opinion; we'll likely need caching to make it nice), and more importantly make it possible to check quickly which users have sent messages to a topic for the "Topics I follow" feature. Fixes part of #13726.
21 lines
651 B
Python
21 lines
651 B
Python
# Generated by Django 2.2.12 on 2020-04-30 00:35
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from django.db import migrations
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class Migration(migrations.Migration):
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atomic = False
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dependencies = [
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('zerver', '0278_remove_userprofile_alert_words'),
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]
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operations = [
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migrations.RunSQL("""
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CREATE INDEX CONCURRENTLY IF NOT EXISTS zerver_message_recipient_upper_subject ON zerver_message (recipient_id, upper(subject::text), id DESC NULLS LAST);
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"""),
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migrations.RunSQL("""
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CREATE INDEX CONCURRENTLY IF NOT EXISTS zerver_message_recipient_subject ON zerver_message (recipient_id, subject, id DESC NULLS LAST);
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"""),
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]
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