memcached

数据库介绍与分类

由 匆匆过客 提交于 2020-01-06 00:30:57
第1章 数据库介绍与分类 1.1 数据库介绍 什么是数据库 简单的说，数据库就是一个存放计算机数据的仓库，这个仓库是按照一定的数据结构（数据结构是指数据的组织形式或数据之间的联系）来对数据进行组织和存储的，我们可以通过数据库提供的多种方法来管理其中的数据。 1.2 数据库的种类 按照早期的数据库理论，比较流行的数据库模型有三种，分别为层次式数据库、网状数据库和关系型数据库。而在当今的互联网企业中，最常用的数据库模式主要有两种，即关系型数据库和非关系型数据库。 1.2.1 关系型数据库介绍 （1）关系型数据库由来 虽然网状数据库和层次数据库已经很好地解决了数据的集中和共享问题，但是在数据独立和抽象级别上仍有很大欠缺。用户在对这两种数据库进行存取时，仍然需要明确数据的存储结构，指出存取路径。而关系数据库就可以比较好地解决这些问题。 （2）关系型数据库介绍 关系型数据库模型是把复杂的数据结构归结为简单的二元关系（即二维表格形式）。在关系型数据库中，对数据的操作几乎全部建立在一个或多个关系表格上，通过这些关联的表格分类、合并、连接或选取等运算来实现数据的管理。 关系型数据库诞生距今已有40多年了，从理论产生到发展到实现产品，例如：常见的MySQL和Oracle数据库，oracle在数据库领域里上升到了霸主地位，形成每年高达数百亿美元的庞大产业市场，而MySQL也是不容忽视的数据库

How to tell Django, that memcached running with item-size larger than default?

由 房东的猫 提交于 2020-01-05 10:07:35
问题 Im using new setting to increase item size in memcached, but i cant store something larger than 1mb through Django backend. I know that memcache module require some setting to achieve thath, and Django use this module in backend. 回答1: From Maximum size of object that can be saved in memcached with memcache.py: There are two entries about that in the memcached FAQ : What is the maximum data size you can store? Why are items limited to 1 megabyte in size? The answer to the first one is (quoting

Save an entity to memcache but not the disk with Objectify

由 眉间皱痕 提交于 2020-01-05 09:59:38
问题 I've got an entity that I use for non-critical logging of game completion rates, basically just simple counters. Due to the fact this will be updated hundreds of thousands of times a day (and hopefully growing) it'll live (almost) permanently in memcache. To save myself from having to pay for those hundreds of thousands of writes of non-critical data I'm happy to risk having to object persisted in memcache with a disk write only every 15 minutes or so. I can't see any obvious way to do it,

Save an entity to memcache but not the disk with Objectify

由 耗尽温柔 提交于 2020-01-05 09:50:03
问题 I've got an entity that I use for non-critical logging of game completion rates, basically just simple counters. Due to the fact this will be updated hundreds of thousands of times a day (and hopefully growing) it'll live (almost) permanently in memcache. To save myself from having to pay for those hundreds of thousands of writes of non-critical data I'm happy to risk having to object persisted in memcache with a disk write only every 15 minutes or so. I can't see any obvious way to do it,

Memcached::getStats not working with Couchbase

由 随声附和 提交于 2020-01-05 08:49:47
问题 I recently set up a server that I'm running Apache, PHP, and Couchbase on. However, I've been having problems testing the Couchbase installation. In the past, the way I would test that everything is working is with a simple script to run getStats on Couchbase: <?php $memcache = new Memcached(); $memcache->addServer('127.0.0.1', 11211); $result = $memcache->getStats(); print_r($result); ?> This used to return the normal array of statistics. Lately, though, it doesn't return anything and there

Memcached::getStats not working with Couchbase

由 ⅰ亾dé卋堺 提交于 2020-01-05 08:49:16
问题 I recently set up a server that I'm running Apache, PHP, and Couchbase on. However, I've been having problems testing the Couchbase installation. In the past, the way I would test that everything is working is with a simple script to run getStats on Couchbase: <?php $memcache = new Memcached(); $memcache->addServer('127.0.0.1', 11211); $result = $memcache->getStats(); print_r($result); ?> This used to return the normal array of statistics. Lately, though, it doesn't return anything and there

“Smart” Caching System using PDO and Memcache

由 流过昼夜 提交于 2020-01-05 07:34:13
问题 I am working on a "smart" caching system that uses pdo and memcache. However, I am stuck at this error. Can you help me out? My Code: $session = "a121fd4ztr6"; cache_query("SELECT * FROM `session` WHERE `session` = :session: LIMIT 1;", array(':session:' => $session)); // CACHE QUERY function cache_query($sql, $params) { global $db; global $memcache; $name = 'querycache-'.md5(serialize(array($sql, $params))); $result = $memcache->get($name); if (!$result) { if(!($db)){ require("db.php"); }

Spring cache using memcached

由 不想你离开。 提交于 2020-01-05 07:31:09
问题 I'm using https://github.com/AKQABER/simple-spring-memcached to have memcached integrated as a cache implementation with spring. But I'had no success :P I'm using spring 4 and spring-data-jpa public interface FooRepository extends JpaRepository<Foo, Long> { @Cacheable(value = "defaultCache", key = "lala") Foo findByNameAndDescription(String name, String description); } I hardcoded the key for test purposes. Nothing special, use a cache called "defaultCache". The configuration of memcached is:

Guaranteed memcached lock

由 青春壹個敷衍的年華 提交于 2020-01-05 04:03:51
问题 So, I'm trying to implement a distributed lock using memcached and add()'s store only if does not exist contract (Java & spymemcached, but applicable in any language of course). Of course, if an instance goes away, then we lose the lock so the thought was add the lock 3 times (e.g. MyLock1, MyLock2, MyLock3) which will very likely hash out to 3 different instances. But, I've realized that if an instances goes down the hash then obviously changes (using spymemcached's Redistribute failure mode

Caching with beaker

由 核能气质少年 提交于 2020-01-05 03:51:12
问题 I have a program that scrapes a website for data. I want to be able to cache that data instead of loading it if its only been a few minutes since it was last retrieved. I looked at beaker but I'm extremely new to cache and not sure if this is what i need. I also do not really understand what the Cachemanager is and why i only use "cache.get" instead of using both "cache.set" and "cache.get". I have included the script that i have been using to test with. from beaker.cache import CacheManager
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