PostgreSQL Source Code

Hacking PostgreSQL

Final Code

PostgreSQL Subsystems

Hacking the PostgreSQL Way

Memory Management

Error Handling / Logging

Catalog Lookups

Nodes

Datums and Tuples

Other Subsystems

Tuples

Tuples are essentially ”rows”, comprised of Datums and other things

Heap Tuple defined in include/access/htup.h

HeapTupleData is in-memory construct

Provides length of tuple, pointer to header

Many different uses

Pointer to disk buffer (must be pin’d)

Empty

Single pmalloc’d chunk

Seperately allocated

Minimal Tuple structure