![]() Note that the following sections describe the behavior of the builtin heap table access method, and the builtin index access methods. This subdirectory is the default location for the database's files in particular, its system catalogs are stored there. Subdirectory containing transaction commit status dataĪ file used for storing configuration parameters that are set by ALTER SYSTEMĪ file recording the command-line options the server was last started withĪ lock file recording the current postmaster process ID (PID), cluster data directory path, postmaster start timestamp, port number, Unix-domain socket directory path (could be empty), first valid listen_address (IP address or *, or empty if not listening on TCP), and shared memory segment ID (this file is not present after server shutdown)įor each database in the cluster there is a subdirectory within PGDATA /base, named after the database's OID in pg_database. Subdirectory containing WAL (Write Ahead Log) files Subdirectory containing state files for prepared transactions Subdirectory containing symbolic links to tablespaces Subdirectory containing subtransaction status data ![]() Subdirectory containing temporary files for the statistics subsystem Subdirectory containing permanent files for the statistics subsystem Subdirectory containing exported snapshots Subdirectory containing information about committed serializable transactions Subdirectory containing replication slot data Subdirectory containing LISTEN/NOTIFY status data Subdirectory containing multitransaction status data (used for shared row locks) Subdirectory containing status data for logical decoding ![]() Subdirectory containing files used by the dynamic shared memory subsystem Subdirectory containing transaction commit timestamp data Subdirectory containing cluster-wide tables, such as pg_database Subdirectory containing per-database subdirectoriesįile recording the log file(s) currently written to by the logging collector A file containing the major version number of PostgreSQL ![]()
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