This is a list of acronyms commonly used in the PostgreSQL documentation and in discussions about PostgreSQL. ANSI American National Standards Institute API Application Programming Interface ASCII American Standard Code for Information Interchange BKI Backend Interface CA Certificate Authority CIDR Classless Inter-Domain Routing CPAN Comprehensive Perl Archive Network CRL Certificate Revocation List CSV Comma Separated Values CTE Common Table Expression CVE Common Vulnerabilities and Exposures DBA Database Administrator DBI Database Interface (Perl) DBMS Database Management System DDL Data Definition Language, SQL commands such as CREATE TABLE, ALTER USER DML Data Manipulation Language, SQL commands such as INSERT, UPDATE, DELETE DST Daylight Saving Time ECPG Embedded C for PostgreSQL ESQL Embedded SQL FAQ Frequently Asked Questions FSM Free Space Map GEQO Genetic Query Optimizer GIN Generalized Inverted Index GiST Generalized Search Tree Git Git GMT Greenwich Mean Time GSSAPI Generic Security Services Application Programming Interface GUC Grand Unified Configuration, the PostgreSQL subsystem that handles server configuration HBA Host-Based Authentication HOT Heap-Only Tuples IEC International Electrotechnical Commission IEEE Institute of Electrical and Electronics Engineers IPC Inter-Process Communication ISO International Organization for Standardization ISSN International Standard Serial Number JDBC Java Database Connectivity JIT Just-in-Time compilation JSON JavaScript Object Notation LDAP Lightweight Directory Access Protocol LSN Log Sequence Number, see pg_lsn and WAL Internals. MITM Man-in-the-middle attack MSVC Microsoft Visual C MVCC Multi-Version Concurrency Control NLS National Language Support ODBC Open Database Connectivity OID Object Identifier OLAP Online Analytical Processing OLTP Online Transaction Processing ORDBMS Object-Relational Database Management System PAM Pluggable Authentication Modules PGSQL PostgreSQL PGXS PostgreSQL Extension System PID Process Identifier PITR Point-In-Time Recovery (Continuous Archiving) PL Procedural Languages (server-side) POSIX Portable Operating System Interface RDBMS Relational Database Management System RFC Request For Comments SGML Standard Generalized Markup Language SNI Server Name Indication, RFC 6066 SPI Server Programming Interface SP-GiST Space-Partitioned Generalized Search Tree SQL Structured Query Language SRF Set-Returning Function SSH Secure Shell SSL Secure Sockets Layer SSPI Security Support Provider Interface SYSV Unix System V TCP/IP Transmission Control Protocol (TCP) / Internet Protocol (IP) TID Tuple Identifier TLS Transport Layer Security TOAST The Oversized-Attribute Storage Technique TPC Transaction Processing Performance Council URL Uniform Resource Locator UTC Coordinated Universal Time UTF Unicode Transformation Format UTF8 Eight-Bit Unicode Transformation Format UUID Universally Unique Identifier WAL Write-Ahead Log XID Transaction Identifier XML Extensible Markup Language