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##Organization of Source Tree

  • doc/: documentation, FAQs
  • src/
    • bin/: client programs(psql, pg_dump, ...)
    • include/: headers *catalog/: system catalog definitions
    • interfaces/: libpq, ecpg
    • pl/: procedural languages(PL/PgSQL, PL/Perl, ...)
    • test/regress/: SQL regression tests.
  • Makefiles
  • Makefile per directory(recursive make)
  • src/makefiles has platform-specific Makefiles
  • src/Makefile.global.in is the top-level Makefile

Backend Source Tree(src/backend)

  • access/: index implementations, heap access manager, transaction management, write-ahead log
  • commands/: implementation of DDL commands
  • executor/:executor logic, implementation of executor nodes
  • libpq/: implementation of backend side of FE/BE protocol
  • optimizer/: query planner
  • parser/: lexer, parser, analysis phase
  • postmaster/: postmaster, stats daemon, AV daemon, ...
  • rewrite/: application of query rewrite rules
  • storage/: shmem, locks ,bufmgr, storage management, ...
  • tcop/: "traffic cop", FE/BE query loop, dispatching from protocol commands -> implementation
  • utils/:
  • adt/: builtin data types, functions, operators
  • cache/: caches for system catalog lookups, query plans
  • hash/: in-memory hash tables
  • mmgr/: memory management
  • sort/: external sorting, TupleStore.