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Why this change? This patch has been added to address the problems identified in https://github.com/rails/rails/issues/35311. For every, new connection created using the PostgreSQL adapter, 3 queries are executed to fetch type map information from the `pg_type` system catalog, adding about 1ms overhead to every connection creation. On multisite clusters where connections are reaped more aggressively, the 3 queries executed accounts for a significant portion of CPU usage on the PostgreSQL cluster. This patch works around the problem by caching the type map in a class level attribute to reuse across connections. |
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|---|---|---|
| .. | ||
| active_record_attribute_methods.rb | ||
| ams_include_without_root.rb | ||
| cache_postgresql_connection_type_map.rb | ||
| copy_file.rb | ||
| cose_rsapkcs1.rb | ||
| fast_pluck.rb | ||
| inflector_backport.rb | ||
| ip_addr.rb | ||
| mail_disable_starttls.rb | ||
| rails_multisite.rb | ||
| rails4.rb | ||
| safe_buffer.rb | ||
| safe_migrations.rb | ||
| schema_migration_details.rb | ||
| sprockets_patches.rb | ||
| translate_accelerator.rb | ||
| web_push_request.rb | ||