счетчике, который расположен внутри базы данных Firebird. Вы можете создать его, задав имя: CREATE GENERATOR GenTest; Затем вы можете получать его текущее значение, увеличивать его или уменьшать точно так Firebird 2 и более поздних версиях ключевое слово SEQUENCE может быть использован как синоним GENERATOR. Фактически, рекомендуется использовать синтаксис SEQUENCE во вновь создаваемом коде. Хотя слово не наделает бед.) Структура системной таблицы RDB$GENERATORS следующая: • RDB$GENERATOR_NAME CHAR(31) • RDB$GENERATOR_ID SMALLINT • RDB$SYSTEM_FLAG SMALLINT И для СУБД Firebird 2.0 и более старших

Firebird Generator Guide A guide on how and when to use generators in Firebird Frank Ingermann Version 0.3, 27 June 2020 Table of Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . 2. Generator Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1. What is a generator? . What is the maximum value of a generator?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.4.1. Client dialects and generator values . . . . . . . . . . .

database table uses an IDENTITY, AUTO_INCREMENT, or SERIAL column, or you have defined a SEQUENCE/GENERATOR, you can use the element in an statement to use or return that database-generated record Student std = (Student) session.selectOne("Student.getById", 1); System.out.println("Details of the student after update operation" ); System.out.println(std.toString());

@GeneratedValue generated way. this field will use generator named " �→ player_id" * @SequenceGenerator using `sequence` feature to create a generator, * and it named "player_jpa_id_seq" in database, initial default), and every operator will increase 1 (by ` �→ allocationSize`) */ @Id @GeneratedValue(generator="player_id") @SequenceGenerator(name="player_id", sequenceName="player_jpa_id_seq", �→ allocationSize=1) and should not be set manually. The attribute generator is used to specify the name of the generator as player_id. • @SequenceGenerator declares a generator that uses sequence, and uses the annotation attribute

move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. We need to generate a lot of random bytes. It is a good move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: /root/.gnupg/trustdb.gpg: trustdb created gpg: key 111111111111127,1.14814814814815,1.01851851851852} r2 | 0.968612680477111 std_err | {1.49587911309236,0.207043331249903,0.346449758034495} t_stats

move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. We need to generate a lot of random bytes. It is a good move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: /root/.gnupg/trustdb.gpg: trustdb created gpg: key {0.111111111111127,1.14814814814815,1.01851851851852} r2 | 0.968612680477111 std_err | {1.49587911309236,0.207043331249903,0.346449758034495} t_stats

move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. We need to generate a lot of random bytes. It is a good move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: /root/.gnupg/trustdb.gpg: trustdb created gpg: key 111111111111127,1.14814814814815,1.01851851851852} r2 | 0.968612680477111 std_err | {1.49587911309236,0.207043331249903,0.346449758034495} t_stats

Engine void MaterializeMetadata::transaction(const MySQLReplication::Position & position, const std::function & fun) { String persistent_tmp_path = persistent_path + ".tmp"; { out); out.next(); out.sync(); out.close(); } commitMetadata(std::move(fun), persistent_tmp_path, persistent_path); } Select history data MaterializeMySQL Database iterator->second, query_context, database_name, comment); /// create table. auto out = std::make_shared(getTableOutput(database_name, table_name, query_context));

move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. We need to generate a lot of random bytes. It is a good move the mouse, utilize the disks) during the prime generation; this gives the random number generator a better chance to gain enough entropy. gpg: /root/.gnupg/trustdb.gpg: trustdb created gpg: key 111111111111127,1.14814814814815,1.01851851851852} r2 | 0.968612680477111 std_err | {1.49587911309236,0.207043331249903,0.346449758034495} t_stats

медленные за счет дополнительных фетчей из памяти Метод цепочек 13 13 Метод цепочек 14 14 Пример: std::unordered_map 1. Стабильность указателей на ключ, значение 2. Возможность хранить большие объекты Хеш-таблица Время ClickHouse HashMap 7.366 сек. Google DenseMap 10.089 сек. Abseil HashMap 9.011 сек. std::unordered_map 44.758 сек. Бенчмарки 28 28 perf stat -e cache-misses:u ./integer_hash_tables_and_hashes Cache misses ClickHouse HashMap 329,664,616 Google DenseMap 383,350,820 Abseil HashMap 415,869,669 std::unordered_map 1,939,811,017 Бенчмарки 29 29 http://norvig.com/21-days.html#answers Бенчмарки