| 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 |
| 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 QHB 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, ИСО | 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 |
| MCF | Most Common Frequency, that is the frequency associated with some Most Common Value |
| MCV | Most Common Value, one of the values appearing most often within a particular table column |
| 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 |
| РАМ | Pluggable Authentication Modules |
| PGXS | DBMS «Quantum Hybrid Base» Extension System |
| PID | Process Identifier |
| PITR | Point-In-Time Recovery (Continuous Archiving) |
| PL | Procedural Languages (server-side) |
| POSIX | Portable Operating System Interface |
| QHB | QuantumHybridBase, DBMS «Quantum Hybrid Base» |
| 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 | Unicode Transformation Format, 8-bit |
| UUID | Universally Unique Identifier |
| WAL | Write-Ahead Log |
| XID | Transaction Identifier |
| XML | Extensible Markup Language |