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After the Redo phase, the database reflects the exact state at the crash. However the changes of uncommitted transactions have to be undone to restore the database to a consistent state. For that we run backwards through the log for each transaction in the TT (those runs can of course be combined into one) using the Previous Sequence Number ...
Reset the nice level of all high-priority and real-time tasks n: b: n: k: Shut off the system o: r: o: y: Output the current registers and flags to the console p: l: p; Display all active high-resolution timers and clock sources. q ' a: q: Switch the keyboard from raw mode, used by programs such as X11 and SVGAlib, to XLATE mode r: p: r: p ...
Database transactions can be used to introduce some level of fault tolerance and data integrity after recovery from a crash. A database transaction is a unit of work, typically encapsulating a number of operations over a database (e.g., reading a database object, writing, acquiring or releasing a lock , etc.), an abstraction supported in ...
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In cryptography, scrypt (pronounced "ess crypt" [1]) is a password-based key derivation function created by Colin Percival in March 2009, originally for the Tarsnap online backup service. [ 2 ] [ 3 ] The algorithm was specifically designed to make it costly to perform large-scale custom hardware attacks by requiring large amounts of memory.
The mechanism was overhauled in 2013; questions edited after being put "on hold" now appear in a review queue. [31] Jeff Atwood stated in 2010 that duplicate questions are not seen as a problem but rather they constitute an advantage if such additional questions drive extra traffic to the site by multiplying relevant keyword hits in search engines.
The 2011 PlayStation Network outage (sometimes referred to as the PSN Hack) was the result of an "external intrusion" on Sony's PlayStation Network and Qriocity services, in which personal details from approximately 77 million accounts were compromised and prevented users of PlayStation 3 and PlayStation Portable consoles from accessing the service.
John The Ripper password cracking tool; Many other specialized operating systems facilitate penetration testing—each more or less dedicated to a specific field of penetration testing. A number of Linux distributions include known OS and application vulnerabilities, and can be deployed as targets to practice against. Such systems help new ...