1.CouchBase是什么

简单来说CouchBase是一款开源的,分布式的nosql数据库,主要用于分布式缓存和数据存储领域。能够通过manage cache提供快速的亚毫米级别的k-v存储操作,并且提供快速的查询和其功能强大的能够指定SQL-like查询的查询引擎。

2.CouchBase的特点
CouchBase是在memcached和redis之类缓存组件的基础上发展而来的,被称作为可能是最好的缓存系统。所其必然能满足之前的前辈所满足不了的地方。
传统的缓存组件包括memcached和redis有着这种或者那种的缺点:
Cluster支持完善度不够或者直接没有Cluster
没有良好的高可用性机制,持久化支持的亦不是很完善
扩容和故障恢复能操作维护复杂
其他
而CouchBase则对上面的一些缺点都有着良好的支持。或者说
CouchBase所提供的任何单一功能,在市面上基本上都能找到一款数据库能够满足。但是这些数据库实际使用的话总是会有各种各样的妥协,性能很好的话,扩展性可能很差之类的。而CouchBase的目标就是建立一个大一统,各种功能都包含可用,所谓接近完美的数据库。
3.CouchBase版本
CouchBase的官网地址如下:
https://www.couchbase.com/
注意:国内部分区域可能由于众所众知的原因无法打开或者打开卡顿。
截止到本文时,CouchBase的最新版本为2018.10月份发布的6.0.0版本。
CouchBase产品众多,二大产产品线Server和Mobile,至于Cloud和Kubernetes则主要是运行的不同平台,每个产品线又区分企业版和社区版两个不同的版本。
本系列主要讲解的是Server产品线的企业版本。
注意:版本限定非常重要,如果没有特殊说明的话,本系列讲解的都是依赖于Server Enterprise 6.0.0版本
具体Enterprise和Community版本对比如下
https://www.couchbase.com/products/editions
| Data access | Community Edition | Enterprise Edition |
| Key-value interface (read/write) | ||
| N1QL (SQL-based queries) | ||
| N1QL for Analytics (SQL++ queries) | ||
| Full-Text Search (FTS) | ||
| Global Secondary Indexes (GSI) | ||
| MapReduce views | ||
| Tunable query consistency | ||
| Tunable durability |
| Development and administration tools | Community Edition | Enterprise Edition |
| Web-based UI | ||
| Graphical explain plan | ||
| Built-in query editor | ||
| Built-in schema browser | ||
| Query monitoring | ||
| REST API | ||
| Command line tools | ||
| Import and export tools | ||
| ANSI Joins support in N1QL | ||
| Couchbase Eventing |
| High availability and disaster recovery | Community Edition | Enterprise Edition |
| Intra-cluster replication | ||
| Automatic failover | ||
| Online rebalancing | ||
| Index replicas and swap rebalance | ||
| Cross Datacenter Replication (XDCR) | ||
| XDCR filtering and throttling | ||
| XDCR timestamp-based conflict resolution | ||
| Rack/availability zone awareness | ||
| Standard backup and restore tools | ||
| High performance enterprise backup and restore tools | ||
| Full, incremental, and cumulative backups | ||
| Automatic failover of disk failures, multi-nodes and server group |
| Security | Community Edition | Enterprise Edition |
| Authentication | ||
| Authorization | ||
| Role-Based Access Control (RBAC) | ||
| LDAP integration | ||
| Encrypted network access | ||
| x.509 CA certificates for TLS | ||
| x.509 CA certificates for data service authentication | ||
| Auditing | ||
| N1QL request auditing | ||
| Log redactions | ||
| Client-side field-level encryption | ||
| IPv6 support |
| Performance and scaling | Community Edition | Enterprise Edition |
| Unlimited query concurrency | ||
| Memory-optimized indexes | ||
| Homogenous scaling (by node) | ||
| Multi-Dimensional Scaling (MDS) | ||
| Plasma – high performance storage engine for indexes | ||
| Fast failover | ||
| Ephemeral buckets | ||
| Ephemeral buckets with Query, Search, XDCR | ||
| Index pushdown | ||
| Index partitioning | ||
| N1QL aggregate pushdown | ||
| End-to-end compression (client to server and XDCR) | ||
| Adaptive indexes |
| Container management and orchestration | Community Edition | Enterprise Edition |
| Autonomous Operator for Kubernetes | ||
| Openshift integration |
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