mongodb-linux-x86_64-2.4.8.zip.002 对象数据库 for linux

DB Browser for SQLite 版本 3.12.2 为 x86_64-little_endian-llp64 构建，运行于 x86_64 Qt 版本 5.12.8 SQLCipher 版本 4.4.0 community (基于 SQLite 3.34.1). 该程序最初由 Tabuleiro Producoes 的 Mauricio Piacentini ( @piacentini ) 作为 Arca 数据库浏览器开发。最初的版本被用作 Arca Database Xtra 的免费配套工具，这是一个商业产品，它嵌入了 SQLite 数据库和一些额外的扩展来处理压缩和二进制数据。 原始代码经过修剪和调整以与标准 SQLite 2.x 数据库兼容。生成的程序被重命名为 SQLite 数据库浏览器，并由 Mauricio 发布到公共领域。图标由同样来自 Tabuleiro的Raquel Ravanini贡献。Jens Miltner ( @jmiltner ) 贡献了代码来支持 1.2 版本的 SQLite 3.x 数据库。

db_autopwn.rb

里面包括了从详细下载,安装,配置,创建数据库.......到主从库配置位置一一列举了例子供参考

Many popular database management systems implement a multiversion concurrency control algorithm called snapshot isolation rather than providing full serializability based on locking. There are well-known anomalies permitted by snapshot isolation that can lead to violations of data consistency by interleaving transactions that would maintain consistency if run serially. Until now, the only way to prevent these anomalies was to modify the applications by introducing explicit locking or ...

Spanner is Google’s scalable, multi-version, globallydistributed, and synchronously-replicated database. It is the first system to distribute data at global scale and support externally-consistent distributed transactions. This paper describes how Spanner is structured, its feature set, the rationale underlying various design decisions, and a novel time API that exposes clock uncertainty. This API and its implementation are critical to supporting external consistency and a variety of powerful ...

Spanner is Google’s highly available global SQL database [CDE+12]. It manages replicated data at great scale, both in terms of size of data and volume of transactions. It assigns globally consistent real-time timestamps to every datum written to it, and clients can do globally consistent reads across the entire database without locking. This leads to three kinds of systems: CA, CP and AP, based on what letter you leave out. Note that you are not entitled to 2 of 3, and many systems have ...

We live in the golden age of distributed computing. Public cloud platforms now offer virtually unlimited compute and storage resources on demand. At the same time, the Software-as-a-Service (SaaS) model brings enterprise-class systems to users who previously could not afford such systems due to their cost and complexity. Alas, traditional data warehousing systems are struggling to fit into this new environment. For one thing, they have been designed for fixed resources and are thus unable to ...

Query optimizer is at the heart of the database systems. Cost-based optimizer studied in this paper is adopted in almost all current database systems. A cost-based optimizer introduces a plan enumeration algorithm to find a (sub)plan, and then uses a cost model to obtain the cost of that plan, and selects the plan with the lowest cost. In the cost model, cardinality, the number of tuples through an operator, plays a crucial role. Due to the inaccuracy in cardinality estimation, errors in cost...

DB - Access Path Selection in a Relational Database Management System.pdf In a high level query and data manipulation language such as SQL, requests are stated non-procedurally, without reference to access paths. This paper describes how System R chooses access paths for both simple (single relation) and complex queries (such as joins), given a user specification of desired data as a boolean expression of predicates. System R is an experimental database management system developed to carry ..