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  2. Pick operating system - Wikipedia

    en.wikipedia.org/wiki/Pick_operating_system

    Its database utilizes a hash-file system, enabling efficient data storage and retrieval by organizing data into dynamic associative arrays managed by associative files. Data within the Pick system is organized into a hierarchical structure of accounts, dictionaries, files, and sub-files based on a hash-table model with linear probing.

  3. Microsoft SQL Server - Wikipedia

    en.wikipedia.org/wiki/Microsoft_SQL_Server

    Microsoft SQL Server (Structured Query Language) is a proprietary relational database management system developed by Microsoft.As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which may run either on the same computer or on another computer across a network (including the Internet).

  4. Salt (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Salt_(cryptography)

    The salt and hash are then stored in the database. To later test if a password a user enters is correct, the same process can be performed on it (appending that user's salt to the password and calculating the resultant hash): if the result does not match the stored hash, it could not have been the correct password that was entered.

  5. Collision attack - Wikipedia

    en.wikipedia.org/wiki/Collision_attack

    This attack is normally harder, a hash of n bits can be broken in 2 (n/2)+1 time steps, but is much more powerful than a classical collision attack. Mathematically stated, given two different prefixes p 1, p 2, the attack finds two suffixes s 1 and s 2 such that hash(p 1 ∥ s 1) = hash(p 2 ∥ s 2) (where ∥ is the concatenation operation).

  6. Surrogate key - Wikipedia

    en.wikipedia.org/wiki/Surrogate_key

    See Date (1998). An important distinction between a surrogate and a primary key depends on whether the database is a current database or a temporal database . Since a current database stores only currently valid data, there is a one-to-one correspondence between a surrogate in the modeled world and the primary key of the database.

  7. Cache replacement policies - Wikipedia

    en.wikipedia.org/wiki/Cache_replacement_policies

    The average memory reference time is [1] = + + where = miss ratio = 1 - (hit ratio) = time to make main-memory access when there is a miss (or, with a multi-level cache, average memory reference time for the next-lower cache)

  8. Hash join - Wikipedia

    en.wikipedia.org/wiki/Hash_join

    The hash join is an example of a join algorithm and is used in the implementation of a relational database management system.All variants of hash join algorithms involve building hash tables from the tuples of one or both of the joined relations, and subsequently probing those tables so that only tuples with the same hash code need to be compared for equality in equijoins.

  9. HashKeeper - Wikipedia

    en.wikipedia.org/wiki/HashKeeper

    HashKeeper compares hash values of known to be good files against the hash values of files on a computer system. Where those values match "known to be good" files, the examiner can say, with substantial certainty, that the corresponding files on the computer system have been previously identified as known to be good and therefore do not need to ...