In-Memory：Hash Index

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SQL Server 2016支持哈希查找,用户可以在内存优化表(Memory-Optimized Table)上创建Hash Index,使用Hash 查找算法,实现数据的极速查找.在使用上,Hash Index 和B-Tree索引的区别是:Hash Index 是无序查找,Index Key必须全部作为Filter,而B-Tree索引是有序查找,不需要Index Key都作为Filter,只需要前序字段存在即可:在存储结构上,Hash Index使用Hash Table实现,存在Hash 冲…

adaptive hash index

An optimization for InnoDB tables that can speed up lookups using = and IN operators, by constructing a hash index in memory. MySQL monitors index searches for InnoDB tables, and if queries could benefit from a hash index, it builds one automatically…

【mysql】Innodb三大特性之adaptive hash index

1.Adaptive Hash Indexes 定义 If a table fits almost entirely in main memory, the fastest way to perform queries on it is to use hash indexes. InnoDB has a mechanism that monitors index searches made to the indexes defined for a table. If InnoDB notices…

only for equality comparisons Hash Index Characteristics

http://dev.mysql.com/doc/refman/5.7/en/index-btree-hash.html Hash Index Characteristics Hash indexes have somewhat different characteristics from those just discussed: They are used only for equality comparisons that use the = or <=> operators (but…

Redis学习笔记（五）基本命令：Hash操作

原文链接:http://doc.redisfans.com/hash/index.html 学习前先明确一下概念,这里我们把Redis的key称作key(键),把数据结构hash中的key称为field(域). hdel key field[field...] 删除hash表中的一个或多个指定域,若key或field不存在则会忽略:例:hdel hk k1 k2. hexists key field 判断hash表中指定域是否存在,返回1,若key或field不存在则返回0:例:hexists…

insert buffer/change buffer double write buffer，双写 adaptive hash index（AHI） innodb的crash recovery innodb重要参数 innodb监控

https://yq.aliyun.com/articles/41000 http://blog.itpub.net/22664653/viewspace-1163838/ http://www.cnblogs.com/MYSQLZOUQI/p/5602206.html https://yq.aliyun.com/articles/222 主从不一致性的3种可能原因1.binlog format是不是row2.session级关闭binlog3.人工在slave修改数据 set sql_log_…