Construct · 2 fields · 2 citations

Where does log collide?

One name. Different field. Different construct. One map.

● jingle · one word, two constructs Nearest construct by meaning·not indexed
log2 CONSTRUCTSLogarithmNAPIER · 1614Write-ahead logARIES · WRITE-AHEAD

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1976Logarithm1992Write-ahead log
2026

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Mathematics

The exponent that produces a number

In mathematics, the logarithm of a number to a given base is the exponent to which the base must be raised to produce that number, turning multiplication into addition and powers into products; the natural logarithm is the inverse of the exponential function and is central to analysis. The concept dates to Napier's 1614 tables, and Rudin's Principles of mathematical analysis develops the exponential and logarithmic functions rigorously from the real and complex number systems. The referent is a function (and its values) inverting exponentiation, expressed in log units of the chosen base, conceptually unrelated to a database's write-ahead log or a ship's speed log, which share only the clipped word “log”.[1]

Unit
The exponent, in the chosen base, that yields a given number
Recovery means
Not applicable
Measured by
Given by the inverse of exponentiation and expressed in log units of the chosen base

Database systems

An append-only record of changes for recovery

In database systems, the log (or write-ahead log) is an append-only sequence of records describing every change, written to stable storage before the change itself is applied, so that committed work can be redone and uncommitted work undone after a crash. Mohan and colleagues' 1992 ARIES defined the write-ahead-logging and recovery method built around such a log and its sequence numbers. The referent is a durable, ordered record of state changes that enables recovery and replication, measured by log volume and sequence position, the record-keeping meaning of “log” it shares with a ship's log but not with the mathematical logarithm.[2]

Unit
The ordered sequence of change records held on stable storage
Recovery means
After a crash, recovery redoes and undoes changes by replaying the log records in order
Measured by
Tracked by log sequence numbers, log volume, and the flush ordering of records

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Nearby collisions

base3 fields · 4 citationsjingle · one word, three constructscomplex4 fields · 4 citationsjingle · one word, four constructscoupon1 fields · 1 citationsanchor · a standalone construct

References

  1. Rudin, W. (1976). Principles of mathematical analysis (3rd ed.). McGraw-Hill. ISBN 9780070542358
  2. Mohan, C., Haderle, D., Lindsay, B., Pirahesh, H., & Schwarz, P. (1992). ARIES: A transaction recovery method supporting fine-granularity locking and partial rollbacks using write-ahead logging. ACM Transactions on Database Systems, 17(1), 94–162. https://doi.org/10.1145/128765.128770

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