Advanced terms
Envelope Encryption
PHP 7.2+
A two-layer scheme where data is encrypted with a per-object data key (DEK), which is itself encrypted by a separately managed key encryption key (KEK).
CWE-311 OWASP A02:2021-Cryptographic Failures
2mo ago
Cryptography advanced
6.5
Entity Linking and Disambiguation
2
Resolving which real-world entity a text mention refers to by mapping it to the correct node in a knowledge base or graph.
3mo ago
Knowledge Engineering advanced
Entity Resolution and Deduplication
2
The process of identifying records that refer to the same real-world entity and merging them into a single canonical representation.
3mo ago
Knowledge Engineering advanced
Escape Analysis
A compiler optimisation that determines whether an object's lifetime escapes its allocating scope, enabling stack allocation or full elimination of heap allocations.
4mo ago
Compiler advanced
Exactly-Once Delivery
5
Exactly-once delivery ensures each message is processed exactly once — achievable only with coordination between broker and consumer using transactions or idempotent producers.
6mo ago
Messaging advanced
eBPF — Kernel-Level Observability
5
Extended Berkeley Packet Filter — a technology for running sandboxed programs in the Linux kernel to trace system calls, network traffic, and performance metrics without modifying applications.
6mo ago
DevOps advanced
Eventual Consistency in Databases
1
A consistency model where replicas are not immediately synchronised — all nodes will converge to the same state given no new writes, trading consistency for availability and partition tolerance.
6mo ago
Database advanced
Exception Groups & except*
Python 3.11+
Python 3.11+ ExceptionGroup allows multiple concurrent exceptions to be raised simultaneously — essential for asyncio.TaskGroup where all tasks run even if some fail.
6mo ago
Python advanced
Elasticsearch
PHP 5.0+
1
A distributed full-text search engine — inverted indexes enable sub-second keyword and relevance-ranked search across millions of documents.
6mo ago
Search advanced
Encryption at Rest
PHP 7.0+ Encrypting stored data so that physical access to storage media does not expose plaintext — protecting against data theft from stolen drives, decommissioned hardware, and storage breaches.
6mo ago
Cryptography advanced
Event Loop Internals
PHP 8.1+
1
The mechanism that enables single-threaded async programs — a loop that checks for completed I/O events, runs their callbacks, then checks again.
6mo ago
Concurrency advanced
Event Sourcing
PHP 7.0+
2
Storing state as an immutable sequence of domain events rather than the current snapshot — the current state is derived by replaying events.
6mo ago
Architecture advanced
Event Storming
A collaborative workshop technique for rapidly exploring complex business domains using sticky notes — surfacing domain events, commands, and bounded contexts.
6mo ago
Architecture advanced
EXPLAIN ANALYZE
PHP 5.0+ The database command that shows the actual execution plan of a query — revealing sequential scans, missing indexes, and row estimate errors that cause slow performance.
6mo ago
Database advanced