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ACID   Atomicity, Consistency, Isolation, and Durability. Four characteristics that a relational database must be able to maintain for transactions.
ADDM   Automatic Database Diagnostic Monitor. A tool that generates performance-tuning reports based on snapshots in the AWR.
ADR   Automatic Diagnostic Repository. Default location for the alert log, trace files, and other information useful for fault finding.
ADRCI   The ADR command-line interface.
AES   Advanced Encryption Standard. A widely used data encryption method.
AL16UTF16   A Unicode fixed-width two-byte character set, commonly specified for the NLS character set used for NVARCHAR2, NCHAR, ...

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