Part VII. Internals

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

Table of Contents

48. Overview of Postgres Pro Internals
48.1. The Path of a Query
48.2. How Connections are Established
48.3. The Parser Stage
48.4. The Postgres Pro Rule System
48.5. Planner/Optimizer
48.6. Executor
49. System Catalogs
49.1. Overview
49.2. pg_aggregate
49.3. pg_am
49.4. pg_amop
49.5. pg_amproc
49.6. pg_attrdef
49.7. pg_attribute
49.8. pg_authid
49.9. pg_auth_members
49.10. pg_cast
49.11. pg_class
49.12. pg_collation
49.13. pg_constraint
49.14. pg_conversion
49.15. pg_database
49.16. pg_db_role_setting
49.17. pg_default_acl
49.18. pg_depend
49.19. pg_description
49.20. pg_enum
49.21. pg_event_trigger
49.22. pg_extension
49.23. pg_foreign_data_wrapper
49.24. pg_foreign_server
49.25. pg_foreign_table
49.26. pg_index
49.27. pg_inherits
49.28. pg_init_privs
49.29. pg_language
49.30. pg_largeobject
49.31. pg_largeobject_metadata
49.32. pg_namespace
49.33. pg_opclass
49.34. pg_operator
49.35. pg_opfamily
49.36. pg_pltemplate
49.37. pg_policy
49.38. pg_proc
49.39. pg_range
49.40. pg_replication_origin
49.41. pg_rewrite
49.42. pg_seclabel
49.43. pg_shdepend
49.44. pg_shdescription
49.45. pg_shseclabel
49.46. pg_statistic
49.47. pg_tablespace
49.48. pg_transform
49.49. pg_trigger
49.50. pg_ts_config
49.51. pg_ts_config_map
49.52. pg_ts_dict
49.53. pg_ts_parser
49.54. pg_ts_template
49.55. pg_type
49.56. pg_user_mapping
49.57. System Views
49.58. pg_available_extensions
49.59. pg_available_extension_versions
49.60. pg_config
49.61. pg_cursors
49.62. pg_file_settings
49.63. pg_group
49.64. pg_indexes
49.65. pg_locks
49.66. pg_matviews
49.67. pg_policies
49.68. pg_prepared_statements
49.69. pg_prepared_xacts
49.70. pg_replication_origin_status
49.71. pg_replication_slots
49.72. pg_roles
49.73. pg_rules
49.74. pg_seclabels
49.75. pg_settings
49.76. pg_shadow
49.77. pg_stats
49.78. pg_tables
49.79. pg_timezone_abbrevs
49.80. pg_timezone_names
49.81. pg_user
49.82. pg_user_mappings
49.83. pg_views
50. Frontend/Backend Protocol
50.1. Overview
50.2. Message Flow
50.3. Streaming Replication Protocol
50.4. Message Data Types
50.5. Message Formats
50.6. Error and Notice Message Fields
50.7. Summary of Changes since Protocol 2.0
51. Writing A Procedural Language Handler
52. Writing A Foreign Data Wrapper
52.1. Foreign Data Wrapper Functions
52.2. Foreign Data Wrapper Callback Routines
52.3. Foreign Data Wrapper Helper Functions
52.4. Foreign Data Wrapper Query Planning
52.5. Row Locking in Foreign Data Wrappers
53. Writing A Table Sampling Method
53.1. Sampling Method Support Functions
54. Writing A Custom Scan Provider
54.1. Creating Custom Scan Paths
54.2. Creating Custom Scan Plans
54.3. Executing Custom Scans
55. Genetic Query Optimizer
55.1. Query Handling as a Complex Optimization Problem
55.2. Genetic Algorithms
55.3. Genetic Query Optimization (GEQO) in Postgres Pro
55.4. Further Reading
56. Index Access Method Interface Definition
56.1. Basic API Structure for Indexes
56.2. Index Access Method Functions
56.3. Index Scanning
56.4. Index Locking Considerations
56.5. Index Uniqueness Checks
56.6. Index Cost Estimation Functions
57. Generic WAL Records
58. GiST Indexes
58.1. Introduction
58.2. Built-in Operator Classes
58.3. Extensibility
58.4. Implementation
58.5. Examples
59. SP-GiST Indexes
59.1. Introduction
59.2. Built-in Operator Classes
59.3. Extensibility
59.4. Implementation
59.5. Examples
60. GIN Indexes
60.1. Introduction
60.2. Built-in Operator Classes
60.3. Extensibility
60.4. Implementation
60.5. GIN Tips and Tricks
60.6. Limitations
60.7. Examples
61. BRIN Indexes
61.1. Introduction
61.2. Built-in Operator Classes
61.3. Extensibility
62. Database Physical Storage
62.1. Database File Layout
62.2. TOAST
62.3. Free Space Map
62.4. Visibility Map
62.5. The Initialization Fork
62.6. Database Page Layout
63. BKI Backend Interface
63.1. BKI File Format
63.2. BKI Commands
63.3. Structure of the Bootstrap BKI File
63.4. Example
64. How the Planner Uses Statistics
64.1. Row Estimation Examples
64.2. Planner Statistics and Security