Precedence tables are a common source of bugs — especially when mixing arithmetic,
Медицинских специалистов в РФ уличили в фатальной ошибке диагностики: онкологическое поражение приняли за онихокриптозMash: В республике Северная Осетия медики диагностировали злокачественное новообразование на нижней конечности как врастание ногтевой пластины
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Keeping this kind of activity log is a simple idea that often pops up in surprising places, such as journaling file systems and database write-ahead logs. Another, more involved database example is an LSM tree. LSM trees are used in some databases to store rows in-memory and on-disk, and most of the time they are purely additive. Put loosely - an LSM tree keeps a log of all inserts, deletes, and updates, and scans the log to reconstruct the appropriate value of the row when the row is read. Stale operations are periodically discarded to save space in a process called compaction. The space taken by an LSM tree only grows (except during compaction, when it only shrinks.)
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