Commonly Used Acronyms by Database Administrators
ACID – Atomicity, Consistency, Isolation, Durability

AIO Asynchronous I/O

BASE - Basically Available, Soft-State, Eventually Consistent...essentially a counterpart to (though not really "opposite" of) ACID, this is the core principle of most NoSQL implementations.

BI - Business Intelligence

BLOB – Binary Large OBject

CAP – Consistency, Availability, Partition tolerance...  The three requirements of a distributed system (as they apply to a database) according to Eric Brewer's CAP Theorem.

CDM – Copy Data Management

CI – Clustered Index

CK – Candidate Key

CLOB – Character Large OBject

CRUD – Create, Read, Update, and Delete

CS – Cursor Stability - an isolation level supported by different database management systems.

CTE – Common Table Expression

DB – Database

DBA – Database Administrator

DBMS – Database Management System

DCL – Data Control Language

DDL – Data Definition Language

DML – Data Manipulation Language

DMV - Dynamic Management Views

DR - Disaster Recovery

DRBD - Distributed Replicated Block Device

DRDA – Distributed Relational Database Architecture

DRI - Declarative Referential Integrity

DSS - Decision Support Systems

DTD – Document Type Definition

DW or DWH – Database Warehouse

EAV – Entity-Attribute-Value (aka. the archenemy)

ERD - Entity Relationship Diagram

ETL – Extract, Transform, Load

FDW - Foreign Data Wrapper (PostgreSQL)

FK – Foreign Key

FLWOR – For, Let, Where, Order, Return - an expression form used within XQuery to query XML within a database (not sure if DB2 only)

FS – Filesystem

FTS – Fulltext Search

GBP – Group Buffer Pool

HA – High Availability

HADR – High Availability Disaster Recovery 

HDD – Hard Disk Drive

ICP – Index Condition Pushdown (MySQL)

IOPS – IO Per Second

IOT – Index Organized Table (Oracle)

ISAM - Indexed Sequential Access Method

I/O – Input/Output

JDBC – Java Database Connectivity

KV – Key/Value

LAMP - Linux, Apache, MySQL and PHP

LBAC - Label Based Access Control

LOB – Large OBject

LPAR – Logical Partition

LRU – Last Recently Used (algorithm)

LUN – Logical Unit Number

MDC – Multidimensional Clustering Table

MDM – Master Data Management

MDX – Multidimensional Expressions

MED – Management of External Data

MQT – Materialized Query Table (IBM DB2)

MV – Materialized View

MVCC – Multiversion Concurrency Control

NAS - Network Attached Storage

NCI – Non-clustered Index

NF - Normal Form (ie: 1NF, first normal form)

ODBC – Open Database Connectivity

ODS - Operational Data Store

OLAP – Online Analytical Processing

OLTP – Online Transaction Processing

OODBMS – Object-Oriented Database Management System

OOM – Out Of Memory

ORM – Object-Relational Mapping

OS – Operating System

PK – Primary Key

PL/pgSQL – Procedural Language/SQL (PostgreSQL) used for writing stored procedures. Similar to PL/SQL.

PL/SQL – Procedural Language/SQL (Oracle) used for writing stored procedures. Also see SQL PL.

QPS – Queries Per Second

RAC – Real Application Clusters (Oracle)

RAID – Redundant Array of Independent Disks

RBAR – Row By Agonizing Row

RDBMS – Relational Database Management System

RBR – Row-Based Replication (MySQL)

RPO - Recovery Point Objective - how much data you can afford to lose. If your server went down, this is the point at which you'd be able to recover the data.

RR – Repeatable Read - an isolation level supported by different database management systems.

RS 

– Read Stability - an isolation level supported by different database management systems.

– Replica Set - multiple physical nodes forming a logical node with redundant data. Most commonly used in the MongoDB ecosystem 

RTO - Recovery Time Objective - how much time it would take you to recover the data to the RPO

SAN – Storage Area Network

SBR – Statement-Based Replication (MySQL)

SCD – Slowly Changing Dimension

SE – Storage Engine (MySQL and forks)

SEQUEL – Structured English QUEry Language, which was IBM's precursor to SQL, which is why SQL is sometimes (often?) pronounced SEQUEL and not S.Q.L.

SP – Stored Procedure

SQL – Structured Query Language

SQL PL – SQL Procedure Language used for writing stored procedures. Also see PL/SQL.

SQL/XML – an extension of the SQL language used for querying XML.

SSD – Solid State Drive

TPS* - Transactions Per Second, a measurement of database performance.

UAT - User Acceptance Testing

UDF – User Defined Function

UDT – User Defined Type

UR – Uncommitted Read - an isolation level supported by different database management systems.

URLT - Update Resume; Leave Town - For those DBAs that don't bother putting together a proper recovery strategy

XML – eXtensible Markup Language

XSD – XML Schema Definition

XSLT – XML Stylesheet Transformation