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Data ValuesManual ChaptersPG1844.2. Data Values Generally speaking, the aim of PL/Python is to provide a “natural” mapping between the PostgreSQL and the Python worlds. This informs the data mapping rules described below…Data Values Data Values in PL/PerlManual ChaptersPG1843.2. Data Values in PL/Perl The argument values supplied to a PL/Perl function's code are simply the input arguments converted to text form (just as if they had been displayed by a SELECT s…Data Values in PL/Perl Data Values in PL/TclManual ChaptersPG1842.3. Data Values in PL/Tcl The argument values supplied to a PL/Tcl function's code are simply the input arguments converted to text form (just as if they had been displayed by a SELECT sta…Data Values in PL/Tcl Data-Modifying Statements in WITHManual ChaptersPG187.8.4. Data-Modifying Statements in WITH You can use data-modifying statements (INSERT, UPDATE, DELETE, or MERGE) in WITH. This allows you to perform several different operations in the same…Data-Modifying Statements in WITH Data-Modifying Statements in WITHManual ChaptersPG18Data-Modifying Statements in WITH PostgreSQL allows INSERT, UPDATE, DELETE, and MERGE to be used as WITH queries. This is not found in the SQL standard.Data-Modifying Statements in WITH data2pgExtensionsExtensionsMigration framework for discovering, copying, and comparing non-PostgreSQL database content through foreign data wrappers. data2pg Replication and streamsReplication and streams · Extensions data_checksumsConfigurationReferencedata_checksums Preset Options 10 Reports whether data checksums are enabled for this cluster. See data checksums for more information. 11 12 13 14 15 16 17 18 Reports whether data checksums …Configuration · Preset Options data_directoryConfigurationReferencedata_directory File Locations 10 Specifies the directory to use for data storage. This parameter can only be set at server start. 11 12 13 14 15 16 17 18 19 20 9.0 9.1 9.2 9.3 9.4 9.5 9.6 Se…Configuration · File Locations data_directory_modeConfigurationReferencedata_directory_mode Preset Options 11 On Unix systems this parameter reports the permissions of the data directory defined by (data_directory) at startup. (On Microsoft Windows this paramete…Configuration · Preset Options data_historizationExtensionsExtensionsPLPGSQL Script to historize data in partitionned table data_historization UtilitiesUtilities · Extensions data_rigExtensionsExtensionsMultidimensional OLAP fact data type with GiST indexing support. data-type gist olap data_rig AnalyticsAnalytics · Extensions data_sync_retryConfigurationReferencedata_sync_retry Error Handling 10 When set to false, which is the default, PostgreSQL will raise a PANIC-level error on failure to flush modified data files to the filesystem. This causes th…Configuration · Error Handling data_type_privilegesManual ChaptersPG1835.20. data_type_privileges The view data_type_privileges identifies all data type descriptors that the current user has access to, by way of being the owner of the described object or havin…data_type_privileges Database AccessManual ChaptersPG1844.6. Database Access The PL/Python language module automatically imports a Python module called plpy. The functions and constants in this module are available to you in the Python code as p…Database Access Database Access from PL/PerlManual ChaptersPG1843.3.1. Database Access from PL/Perl Access to the database itself from your Perl function can be done via the following functions: spi_exec_query(query [, limit]) spi_exec_query executes an…Database Access from PL/Perl Database Access from PL/TclManual ChaptersPG1842.5. Database Access from PL/Tcl In this section, we follow the usual Tcl convention of using question marks, rather than brackets, to indicate an optional element in a syntax synopsis. The…Database Access from PL/Tcl Database Access FunctionsManual ChaptersPG1844.6.1. Database Access Functions The plpy module provides several functions to execute database commands: plpy.execute(query [, limit]) Calling plpy.execute with a query string and an optio…Database Access Functions Database ConfigurationManual ChaptersPG1822.4. Database Configuration Recall from Chapter 19 that the PostgreSQL server provides a large number of run-time configuration variables. You can set database-specific default values for m…Database Configuration Database Connection Control FunctionsManual ChaptersPG1832.1. Database Connection Control Functions The following functions deal with making a connection to a PostgreSQL backend server. An application program can have several backend connections …Database Connection Control Functions Database File LayoutManual ChaptersPG1866.1. Database File Layout This section describes the storage format at the level of files and directories. Traditionally, the configuration and data files used by a database cluster are sto…Database File Layout Database Object Management FunctionsManual ChaptersPG189.28.7. Database Object Management Functions The functions shown in Table 9.102 calculate the disk space usage of database objects, or assist in presentation or understanding of usage result…Database Object Management Functions Database Page LayoutManual ChaptersPG1866.6. Database Page Layout This section provides an overview of the page format used within PostgreSQL tables and indexes.[19] Sequences and TOAST tables are formatted just like a regular ta…Database Page Layout Database Physical StorageManual ChaptersPG18Chapter 66. Database Physical Storage This chapter provides an overview of the physical storage format used by PostgreSQL databases.Database Physical Storage Database RolesManual ChaptersPG1821.1. Database Roles Database roles are conceptually completely separate from operating system users. In practice it might be convenient to maintain a correspondence, but this is not require…Database Roles Database RolesManual ChaptersPG18Chapter 21. Database Roles PostgreSQL manages database access permissions using the concept of roles. A role can be thought of as either a database user, or a group of database users, depend…Database Roles database_to_xmlFunctionsReferencedatabase_to_xml Xml Functions 10 Note that these potentially produce a lot of data, which needs to be built up in memory. When requesting content mappings of large schemas or databases, it m…Functions · Xml Functions database_to_xml_and_xmlschemaFunctionsReferencedatabase_to_xml_and_xmlschema Xml Functions 10 Note that these potentially produce a lot of data, which needs to be built up in memory. When requesting content mappings of large schemas or d…Functions · Xml Functions database_to_xmlschemaFunctionsReferencedatabase_to_xmlschema Xml Functions 10 Note that these potentially produce a lot of data, which needs to be built up in memory. When requesting content mappings of large schemas or databases…Functions · Xml Functions DataChecksumsWorkerWait EventsReferenceDataChecksumsWorker LWLock 19 Waiting for data checksums worker. 20Wait Events · LWLock dataclipsExtensionsExtensionsArchived, unfinished C prototype for querying Heroku Dataclips through a function and planned FDW. dataclips fdw heroku http dataclips Foreign data wrappersForeign data wrappers · Extensions DataFileExtendWait EventsReferenceDataFileExtend IO 10 Waiting for a relation data file to be extended. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, write, sync, alloca…Wait Events · IO DataFileFlushWait EventsReferenceDataFileFlush IO 10 Waiting for a relation data file to reach durable storage. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, write, syn…Wait Events · IO DataFileImmediateSyncWait EventsReferenceDataFileImmediateSync IO 10 Waiting for an immediate synchronization of a relation data file to durable storage. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expecte…Wait Events · IO DataFilePrefetchWait EventsReferenceDataFilePrefetch IO 10 Waiting for an asynchronous prefetch from a relation data file. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, wr…Wait Events · IO DataFileReadWait EventsReferenceDataFileRead IO 10 Waiting for a read from a relation data file. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, write, sync, allocation,…Wait Events · IO DataFileSyncWait EventsReferenceDataFileSync IO 10 Waiting for changes to a relation data file to reach durable storage. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, …Wait Events · IO DataFileTruncateWait EventsReferenceDataFileTruncate IO 10 Waiting for a relation data file to be truncated. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, write, sync, all…Wait Events · IO DataFileWriteWait EventsReferenceDataFileWrite IO 10 Waiting for a write to a relation data file. 11 12 13 14 15 16 17 18 19 20 The wait is normal when the workload is expected to perform this read, write, sync, allocation,…Wait Events · IO datafly_anonExtensionsExtensionsDatafly anonymizer anonymization gdpr datafly_anon SecuritySecurity · Extensions datalinkExtensionsExtensionsSQL/MED DATALINK data type and functions for controlled access to files outside PostgreSQL background-worker data-type file datalink Data typesData types · Extensions