38 lines
1.1 KiB
Ruby
38 lines
1.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Migrations
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module Observers
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# This observer gathers statistics from the pg_stat_statements extension.
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# Notice that this extension is not installed by default. In case it cannot
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# be found, the observer does nothing and doesn't throw an error.
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class QueryStatistics < MigrationObserver
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include Gitlab::Database::SchemaHelpers
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def before
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return unless enabled?
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connection.execute('select pg_stat_statements_reset()')
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end
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def record
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return unless enabled?
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observation.query_statistics = connection.execute(<<~SQL)
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SELECT query, calls, total_time, max_time, mean_time, rows
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FROM pg_stat_statements
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ORDER BY total_time DESC
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SQL
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end
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private
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def enabled?
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function_exists?(:pg_stat_statements_reset) && connection.view_exists?(:pg_stat_statements)
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end
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end
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end
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end
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end
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end
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