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WordPress transients are a caching mechanism that stores data with expiration times in the wp_options table, creating two database rows per transient. Without proper management, expired transients accumulate as orphaned rows, causing database bloat and performance issues. The article explains the technical mechanics of transient storage, the lack of automatic garbage collection, and provides an SQL query for manual cleanup. It covers object caching benefits and constraints (including the critical 1MB buffer limit), and outlines best practices like strict namespacing, proper expiration handling, key length management, and the get/check/set pattern for reliable transient usage.

The Art of the WordPress Transient: Performance, Persistence, and Database Bloat

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