PostgreSQL Pages and Tuples
INTERNAL LAYOUT: a tuple or an item is a synonym for a row a relation is a synonym for a table a filenode is an id which represent a reference to a table or an index. a block and page are equals and they represent a 8kb segment information the file storing the table. a heap refer to heap file . Heap files are lists of unordered records of variable size. Although sharing a similar name, heap files are different from heap data structure. CTID represent the physical location of the row version within its table. CTID is also a special column available for every tables but not visible unless specifically mentioned. It consists of a page number and the index of an item identifier. OID stands for Object Identifier. database cluster , we call a database cluster the storage area on disk. A database cluster is a collection of databases that is managed by a single instance of a running database server. Page: Inside the data file (heap table and index, as well as the free space ma