简介

CHDB (constant hash database) is a fast key-value database for constant data, realized by using a memory-mapped file and thus providing the following functionalities:

Extremely fast initial load, regardless of the size of the database.
Only the pages of the file which are actually used are loaded from the disk.
Once a page is loaded it is shared across multiple processes.
Loaded pages are cached across multiple requests and even process recycling.

A typical use of CHDB is as a faster alternative to defining many PHP constants.

CHDB is internally implemented as a hash-table using a » perfect hashing function, thus guaranteeing worst case O(1) lookup time.

php chdb 预定义常量 php chdb creates a chdb instance php chdb 范例 php chdb gets the value associated with a key php chdb 安装／配置 php chdb the chdb class php 范例 xml 元素结构例程 php 安装／配置安装 php 安装／配置资源类型 php chdb 函数 creates a chdb file php sodium 函数 overwrite buf with zeros php posix 正则表达式函数用正则表达式不区分大小写将字符串分割到数组中 php sqlite 函数 fetches the next row from a result set as an array php chdb 简介 php mysql xdevapi tableupdate set search filter php 安装／配置需求 php mysqli result get the number of fields in a result php chdb chdb 函数 php yaf dispatcher 设置路由的默认模块 php yaf loader the import purpose