Graham McIntire
400e444eaa
- Add aggressive autovacuum settings for packet_counters table - Replace table-based counter with PostgreSQL sequence to eliminate bloat - Sequences are designed for high-frequency counter operations - Maintains backward compatibility through get_packet_count() function The packet_counters table was experiencing severe bloat due to 350K+ updates on a single row. PostgreSQL sequences avoid this issue entirely. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
52 lines
1.6 KiB
Elixir
52 lines
1.6 KiB
Elixir
defmodule Aprsme.Repo.Migrations.OptimizePacketCountersAutovacuum do
|
|
use Ecto.Migration
|
|
|
|
def up do
|
|
# Set aggressive autovacuum settings for the packet_counters table
|
|
# This table has only one row that gets updated frequently
|
|
execute """
|
|
ALTER TABLE packet_counters SET (
|
|
autovacuum_vacuum_scale_factor = 0.0,
|
|
autovacuum_vacuum_threshold = 100,
|
|
autovacuum_analyze_scale_factor = 0.0,
|
|
autovacuum_analyze_threshold = 100,
|
|
autovacuum_vacuum_cost_delay = 0,
|
|
autovacuum_vacuum_cost_limit = 10000
|
|
);
|
|
"""
|
|
|
|
# Add a fillfactor to reduce page splits during updates
|
|
execute """
|
|
ALTER TABLE packet_counters SET (fillfactor = 50);
|
|
"""
|
|
|
|
# Note: VACUUM FULL cannot run in a transaction, so we'll skip it here
|
|
# You can run it manually after the migration:
|
|
# VACUUM FULL packet_counters;
|
|
|
|
# Create a more efficient counter mechanism using unlogged table for high-frequency updates
|
|
# This is an alternative approach if the above doesn't solve the bloat issue
|
|
execute """
|
|
COMMENT ON TABLE packet_counters IS 'Single-row table for packet counts. Configured with aggressive autovacuum due to high update frequency.';
|
|
"""
|
|
end
|
|
|
|
def down do
|
|
# Reset to default autovacuum settings
|
|
execute """
|
|
ALTER TABLE packet_counters RESET (
|
|
autovacuum_vacuum_scale_factor,
|
|
autovacuum_vacuum_threshold,
|
|
autovacuum_analyze_scale_factor,
|
|
autovacuum_analyze_threshold,
|
|
autovacuum_vacuum_cost_delay,
|
|
autovacuum_vacuum_cost_limit,
|
|
fillfactor
|
|
);
|
|
"""
|
|
|
|
execute """
|
|
COMMENT ON TABLE packet_counters IS NULL;
|
|
"""
|
|
end
|
|
end
|