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If you create a new table which belongs to the database created under the base directory, first, the new directory, whose name is the same as the existing database OID, is created under the version specific subdirectory, and then the new table file is placed under the created directory.sampledb=# CREATE TABLE newtbl (.....) TABLESPACE new_tblspc; sampledb=# SELECT pg_relation_filepath('newtbl'); pg_relation_filepath ---------------------------------------------- pg_tblspc/16386/PG_9.4_201409291/16384/18894 Inside the data file (heap table and index, as well as the free space map and visibility map), it is divided into pages (or blocks) of fixed length, the default is 8192 byte (8 KB).Also there are several subdirectories containing particular data, and configuration files.While Postgre SQL supports tablespaces, the meaning of the term is different from other RDBMS.A Postgre SQL server runs on a single host and manages a single database cluster.Figure 1.1 shows the logical structure of a database cluster. In the relational database theory, a database object is a data structure used either to store or to reference data.If you execute the initdb utility to initialize a new database cluster, a base directory will be created under the specified directory.

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If you hear this definition now for the first time, you might be wondering about it, but the term "database cluster" in Postgre SQL does not mean "a group of database servers".All other database objects (e.g., tables, indexes, etc) belong to their respective databases.Figure 1.1: Logical structure of a database cluster All the database objects in Postgre SQL are internally managed by respective object identifiers (OIDs), which are unsigned 4-byte integers.Indexes only have individual free space maps and don't have visibility map.A specific example is shown below: $ cd $PGDATA $ ls -la base/16384/18751* -rw------- 1 postgres postgres 8192 Apr 21 base/16384/18751 -rw------- 1 postgres postgres 24576 Apr 21 base/16384/18751_fsm -rw------- 1 postgres postgres 8192 Apr 21 base/16384/18751_vm They may also be internally referred to as the forks of each relation; the free space map is the first fork of the table/index data file (the fork number is 1), the visibility map the second fork of the table's data file (the fork number is 2). A tablespace in Postgre SQL is an additional data area outside the base directory. Figure 1.3 shows the internal layout of a tablespace, and the relationship with the main data area.

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