key size
English-Russian cryptological dictionary . 2014 .
Смотреть что такое «key size» в других словарях:
Key size — In cryptography, key size or key length is the size measured in bits[1] of the key used in a cryptographic algorithm (such as a cipher). An algorithm s key length is distinct from its cryptographic security, which is a logarithmic measure of the… … Wikipedia
Key (cryptography) — In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would produce no useful result. In encryption, a key specifies the… … Wikipedia
Key West — is an island in the Straits of Florida on the North American continent at the southernmost tip of the Florida Keys.Key West is politically within the limits of the city of Key West, Monroe County, Florida, United States. The city also occupies… … Wikipedia
Key deer — A male Key Deer on No Name Key in the Florida Keys Conservation status … Wikipedia
Key Largo Woodrat — Conservation status Endangered ( … Wikipedia
Key performance indicator — Key Performance Indicators (KPI) are financial and non financial metrics used to help an organization define and measure progress toward organizational goals [ [http://management.about.com/cs/generalmanagement/a/keyperfindic.htm Key Performance… … Wikipedia
Key silverside — Conservation status Near Threatened (IUCN 2.3) Scientific classification Kingd … Wikipedia
Key frame — A key frame in animation and filmmaking is a drawing which defines the starting and ending points of any smooth transition. They are called frames because their position in time is measured in frames on a strip of film. A sequence of keyframes… … Wikipedia
Key West, Florida — Infobox Settlement official name = City of Key West other name = native name = nickname = The Conch Republic and the Southernmost City In The Continental United States settlement type = City motto = One human family imagesize = image caption =… … Wikipedia
Key strengthening — In cryptography, key strengthening or key stretching refer to techniques used to make a possibly weak key, typically a password or passphrase, more secure against a brute force attack by increasing the time it takes to test each possible key.… … Wikipedia
Key Biscayne, Florida — Infobox Settlement official name = Village of Key Biscayne other name = native name = nickname = settlement type = Village motto = imagesize = image caption = flag size = image seal size = image shield = shield size = image blank emblem = blank… … Wikipedia
Источник
key size
English-Russian dictionary of terms that are used in computer games . 2014 .
Смотреть что такое «key size» в других словарях:
Key size — In cryptography, key size or key length is the size measured in bits[1] of the key used in a cryptographic algorithm (such as a cipher). An algorithm s key length is distinct from its cryptographic security, which is a logarithmic measure of the… … Wikipedia
Key (cryptography) — In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would produce no useful result. In encryption, a key specifies the… … Wikipedia
Key West — is an island in the Straits of Florida on the North American continent at the southernmost tip of the Florida Keys.Key West is politically within the limits of the city of Key West, Monroe County, Florida, United States. The city also occupies… … Wikipedia
Key deer — A male Key Deer on No Name Key in the Florida Keys Conservation status … Wikipedia
Key Largo Woodrat — Conservation status Endangered ( … Wikipedia
Key performance indicator — Key Performance Indicators (KPI) are financial and non financial metrics used to help an organization define and measure progress toward organizational goals [ [http://management.about.com/cs/generalmanagement/a/keyperfindic.htm Key Performance… … Wikipedia
Key silverside — Conservation status Near Threatened (IUCN 2.3) Scientific classification Kingd … Wikipedia
Key frame — A key frame in animation and filmmaking is a drawing which defines the starting and ending points of any smooth transition. They are called frames because their position in time is measured in frames on a strip of film. A sequence of keyframes… … Wikipedia
Key West, Florida — Infobox Settlement official name = City of Key West other name = native name = nickname = The Conch Republic and the Southernmost City In The Continental United States settlement type = City motto = One human family imagesize = image caption =… … Wikipedia
Key strengthening — In cryptography, key strengthening or key stretching refer to techniques used to make a possibly weak key, typically a password or passphrase, more secure against a brute force attack by increasing the time it takes to test each possible key.… … Wikipedia
Key Biscayne, Florida — Infobox Settlement official name = Village of Key Biscayne other name = native name = nickname = settlement type = Village motto = imagesize = image caption = flag size = image seal size = image shield = shield size = image blank emblem = blank… … Wikipedia
Источник
key size
размер ключа
длина ключа
—
[[http://www.rfcmd.ru/glossword/1.8/index.php?a=index&d=23]]
Тематики
Синонимы
Англо-русский словарь нормативно-технической терминологии . academic.ru . 2015 .
Смотреть что такое «key size» в других словарях:
Key size — In cryptography, key size or key length is the size measured in bits[1] of the key used in a cryptographic algorithm (such as a cipher). An algorithm s key length is distinct from its cryptographic security, which is a logarithmic measure of the… … Wikipedia
Key (cryptography) — In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would produce no useful result. In encryption, a key specifies the… … Wikipedia
Key West — is an island in the Straits of Florida on the North American continent at the southernmost tip of the Florida Keys.Key West is politically within the limits of the city of Key West, Monroe County, Florida, United States. The city also occupies… … Wikipedia
Key deer — A male Key Deer on No Name Key in the Florida Keys Conservation status … Wikipedia
Key Largo Woodrat — Conservation status Endangered ( … Wikipedia
Key performance indicator — Key Performance Indicators (KPI) are financial and non financial metrics used to help an organization define and measure progress toward organizational goals [ [http://management.about.com/cs/generalmanagement/a/keyperfindic.htm Key Performance… … Wikipedia
Key silverside — Conservation status Near Threatened (IUCN 2.3) Scientific classification Kingd … Wikipedia
Key frame — A key frame in animation and filmmaking is a drawing which defines the starting and ending points of any smooth transition. They are called frames because their position in time is measured in frames on a strip of film. A sequence of keyframes… … Wikipedia
Key West, Florida — Infobox Settlement official name = City of Key West other name = native name = nickname = The Conch Republic and the Southernmost City In The Continental United States settlement type = City motto = One human family imagesize = image caption =… … Wikipedia
Key strengthening — In cryptography, key strengthening or key stretching refer to techniques used to make a possibly weak key, typically a password or passphrase, more secure against a brute force attack by increasing the time it takes to test each possible key.… … Wikipedia
Key Biscayne, Florida — Infobox Settlement official name = Village of Key Biscayne other name = native name = nickname = settlement type = Village motto = imagesize = image caption = flag size = image seal size = image shield = shield size = image blank emblem = blank… … Wikipedia
Источник
key_buffer_size и myisam_sort_buffer_size
Дата 09.03.2018 Автор Alex Рубрика Интернет, Сервер
Качественная настройка параметров MySQL сервера увеличивает его производительность и снижает потребление оперативной памяти. Одними из основных параметров являются размеры буферов, которые должны быть подобраны под размер данных. Речь пойдёт об key_buffer_size и myisam_sort_buffer_size.
Оба параметра key_buffer_size и myisam_sort_buffer_size относятся к типу таблиц MyISAM. Точнее к их индексам. Но не стоит задавать этим параметрам значение «ноль», даже если используете в своём проекте только таблицы типа InnoDB. Это приведёт к падению производительности из-за того, что сама MySQL использует системные таблицы, которые хранятся как MyISAM.
В интернете можно столкнуться с советами типа: «Установите значение этих буферов равным 80% всей оперативной памяти». Но это слишком большая роскошь. Лучше выставить размер основываясь на текущих нуждах. Для этого определим сколько же всего на сервере есть таблиц MyISAM. Для этого в командную строку MySQL и из-под суперпользователя базы введём команду:
SELECT table_name FROM INFORMATION_SCHEMA.TABLES WHERE engine = ‘MyISAM’;
На сервере только этот блог работает на WordPress и хранит таблицы типа MyISAM. Поэтому результат получился такой:
Все базы с префиксом «wp_» относятся к блогу. Остальные таблицы системные. Для определения размеров буферов логично будет отталкиваться от суммарного размера индексов всех MyISAM таблиц.
Чтобы определить размер индексов, оставим сайт включённым на несколько дней, чтобы они создались и накопились в достаточном количестве. А затем получим общий размер индексов в байтах с помощью команды:
SELECT SUM(index_length) FROM information_schema.tables WHERE engine=’MyISAM’;
В моём случае результат такой:
Это означает, что имеются 158 килобайт индексов. С этого момента начинаются тяжёлые думы о размерах буферов key_buffer_size и myisam_sort_buffer_size. Мне кажется, что делать буферы равными 80% ОЗУ — это неправильно. На личном опыте можно убедиться, что со временем размер индексов довольно быстро перестаёт расти. Нет нужды делать большой запас. Поэтому для 158 килобайт индексов будет вполне приемлем десятикратный запас в 2 мегабайта.
Чтобы выставить значения буферов ерейдём в файл конфига базы и пропишем:
[mysqld]
myisam_sort_buffer_size = 2M
key_buffer_size = 2M
Чтобы не перезапускать сервер, можно выставить значения текущей сесси (но обязательно пропишите в файл конфига, иначе они сбросятся при рестарте сервера):
SET @@global.myisam_sort_buffer_size=2*1024*1024;
SET @@global.key_buffer_size=2*1024*1024;
Посмотрим сколько занимают индексы сейчас с помощью команд:
SHOW VARIABLES LIKE ‘key_buffer_size’;
SHOW VARIABLES LIKE ‘myisam_sort_buffer_size’;
Используйте следующую команду, если понадобится определить размер индексов за исключением системных:
SELECT SUM(index_length) FROM information_schema.tables WHERE engine=’MyISAM’ AND table_schema NOT IN (‘information_schema’,’mysql’);
Результат будет показан в байтах. Если убрать NOT из команды, то получите размер только системных индексов.
Источник
key size
Англо-русский словарь по компьютерной безопасности . Академик.ру . 2011 .
Смотреть что такое «key size» в других словарях:
Key size — In cryptography, key size or key length is the size measured in bits[1] of the key used in a cryptographic algorithm (such as a cipher). An algorithm s key length is distinct from its cryptographic security, which is a logarithmic measure of the… … Wikipedia
Key (cryptography) — In cryptography, a key is a piece of information (a parameter) that determines the functional output of a cryptographic algorithm or cipher. Without a key, the algorithm would produce no useful result. In encryption, a key specifies the… … Wikipedia
Key West — is an island in the Straits of Florida on the North American continent at the southernmost tip of the Florida Keys.Key West is politically within the limits of the city of Key West, Monroe County, Florida, United States. The city also occupies… … Wikipedia
Key deer — A male Key Deer on No Name Key in the Florida Keys Conservation status … Wikipedia
Key Largo Woodrat — Conservation status Endangered ( … Wikipedia
Key performance indicator — Key Performance Indicators (KPI) are financial and non financial metrics used to help an organization define and measure progress toward organizational goals [ [http://management.about.com/cs/generalmanagement/a/keyperfindic.htm Key Performance… … Wikipedia
Key silverside — Conservation status Near Threatened (IUCN 2.3) Scientific classification Kingd … Wikipedia
Key frame — A key frame in animation and filmmaking is a drawing which defines the starting and ending points of any smooth transition. They are called frames because their position in time is measured in frames on a strip of film. A sequence of keyframes… … Wikipedia
Key West, Florida — Infobox Settlement official name = City of Key West other name = native name = nickname = The Conch Republic and the Southernmost City In The Continental United States settlement type = City motto = One human family imagesize = image caption =… … Wikipedia
Key strengthening — In cryptography, key strengthening or key stretching refer to techniques used to make a possibly weak key, typically a password or passphrase, more secure against a brute force attack by increasing the time it takes to test each possible key.… … Wikipedia
Key Biscayne, Florida — Infobox Settlement official name = Village of Key Biscayne other name = native name = nickname = settlement type = Village motto = imagesize = image caption = flag size = image seal size = image shield = shield size = image blank emblem = blank… … Wikipedia
Источник