Part VII. Internals

This part contains assorted information that might be of use to Postgres Pro developers.

Table of Contents

50. Overview of Postgres Pro Internals
50.1. The Path of a Query
50.2. How Connections are Established
50.3. The Parser Stage
50.4. The Postgres Pro Rule System
50.5. Planner/Optimizer
50.6. Executor
51. System Catalogs
51.1. Overview
51.2. pg_aggregate
51.3. pg_am
51.4. pg_amop
51.5. pg_amproc
51.6. pg_attrdef
51.7. pg_attribute
51.8. pg_authid
51.9. pg_auth_members
51.10. pg_cast
51.11. pg_class
51.12. pg_collation
51.13. pg_constraint
51.14. pg_conversion
51.15. pg_database
51.16. pg_db_role_setting
51.17. pg_default_acl
51.18. pg_depend
51.19. pg_description
51.20. pg_enum
51.21. pg_event_trigger
51.22. pg_extension
51.23. pg_foreign_data_wrapper
51.24. pg_foreign_server
51.25. pg_foreign_table
51.26. pg_index
51.27. pg_inherits
51.28. pg_init_privs
51.29. pg_language
51.30. pg_largeobject
51.31. pg_largeobject_metadata
51.32. pg_namespace
51.33. pg_opclass
51.34. pg_operator
51.35. pg_opfamily
51.36. pg_partitioned_table
51.37. pg_pltemplate
51.38. pg_policy
51.39. pg_proc
51.40. pg_publication
51.41. pg_publication_rel
51.42. pg_range
51.43. pg_replication_origin
51.44. pg_rewrite
51.45. pg_seclabel
51.46. pg_sequence
51.47. pg_shdepend
51.48. pg_shdescription
51.49. pg_shseclabel
51.50. pg_statistic
51.51. pg_statistic_ext
51.52. pg_subscription
51.53. pg_subscription_rel
51.54. pg_tablespace
51.55. pg_transform
51.56. pg_trigger
51.57. pg_ts_config
51.58. pg_ts_config_map
51.59. pg_ts_dict
51.60. pg_ts_parser
51.61. pg_ts_template
51.62. pg_type
51.63. pg_user_mapping
51.64. System Views
51.65. pg_available_extensions
51.66. pg_available_extension_versions
51.67. pg_config
51.68. pg_cursors
51.69. pg_file_settings
51.70. pg_group
51.71. pg_hba_file_rules
51.72. pg_indexes
51.73. pg_locks
51.74. pg_matviews
51.75. pg_policies
51.76. pg_prepared_statements
51.77. pg_prepared_xacts
51.78. pg_publication_tables
51.79. pg_recovery_settings
51.80. pg_replication_origin_status
51.81. pg_replication_slots
51.82. pg_roles
51.83. pg_rules
51.84. pg_seclabels
51.85. pg_sequences
51.86. pg_settings
51.87. pg_shadow
51.88. pg_stats
51.89. pg_tables
51.90. pg_timezone_abbrevs
51.91. pg_timezone_names
51.92. pg_user
51.93. pg_user_mappings
51.94. pg_views
52. Frontend/Backend Protocol
52.1. Overview
52.2. Message Flow
52.3. SASL Authentication
52.4. Streaming Replication Protocol
52.5. Logical Streaming Replication Protocol
52.6. Message Data Types
52.7. Message Formats
52.8. Error and Notice Message Fields
52.9. Logical Replication Message Formats
52.10. Summary of Changes since Protocol 2.0
53. Writing A Procedural Language Handler
54. Writing A Foreign Data Wrapper
54.1. Foreign Data Wrapper Functions
54.2. Foreign Data Wrapper Callback Routines
54.3. Foreign Data Wrapper Helper Functions
54.4. Foreign Data Wrapper Query Planning
54.5. Row Locking in Foreign Data Wrappers
55. Writing A Table Sampling Method
55.1. Sampling Method Support Functions
56. Writing A Custom Scan Provider
56.1. Creating Custom Scan Paths
56.2. Creating Custom Scan Plans
56.3. Executing Custom Scans
57. Genetic Query Optimizer
57.1. Query Handling as a Complex Optimization Problem
57.2. Genetic Algorithms
57.3. Genetic Query Optimization (GEQO) in Postgres Pro
57.4. Further Reading
58. Index Access Method Interface Definition
58.1. Basic API Structure for Indexes
58.2. Index Access Method Functions
58.3. Index Scanning
58.4. Index Locking Considerations
58.5. Index Uniqueness Checks
58.6. Index Cost Estimation Functions
59. Generic WAL Records
60. B-Tree Indexes
60.1. Introduction
60.2. Behavior of B-Tree Operator Classes
60.3. B-Tree Support Functions
60.4. Implementation
61. GiST Indexes
61.1. Introduction
61.2. Built-in Operator Classes
61.3. Extensibility
61.4. Implementation
61.5. Examples
62. SP-GiST Indexes
62.1. Introduction
62.2. Built-in Operator Classes
62.3. Extensibility
62.4. Implementation
62.5. Examples
63. GIN Indexes
63.1. Introduction
63.2. Built-in Operator Classes
63.3. Extensibility
63.4. Implementation
63.5. GIN Tips and Tricks
63.6. Limitations
63.7. Examples
64. BRIN Indexes
64.1. Introduction
64.2. Built-in Operator Classes
64.3. Extensibility
65. Database Physical Storage
65.1. Database File Layout
65.2. TOAST
65.3. Free Space Map
65.4. Visibility Map
65.5. The Initialization Fork
65.6. Database Page Layout
66. System Catalog Declarations and Initial Contents
66.1. System Catalog Declaration Rules
66.2. System Catalog Initial Data
66.3. BKI File Format
66.4. BKI Commands
66.5. Structure of the Bootstrap BKI File
66.6. BKI Example
67. How the Planner Uses Statistics
67.1. Row Estimation Examples
67.2. Multivariate Statistics Examples
67.3. Planner Statistics and Security