发布时间：2015-03-15 12:28:44

  eXtremeDB中没有TO_VARCHAR函数，但是有一个类似功能的函数 FORMAT。其用法如下所示(eXtremeDB区分字母大小写)：  点击(此处)折叠或打开XSQL>create table t(dt timestamp);XSQL>insert into t values (now);XSQL>select * from t;.........【阅读全文】

发布时间：2015-03-07 22:32:07

 在eXtremeDB使用SQL时候，必须确保SQL语句符合SQL-89或SQL-92标准，或者遵循eXtremeSQL语法。 eXtremeSQL对字母大小写是敏感的，例如select * from metatable是错误的，必须是select * from Metatable。 当使用创建表时，如果字段非空，且使用索引，那么相应的格式是：create table test(str unicod.........【阅读全文】

发布时间：2015-03-01 17:10:42

 In the eXtremeDB, there is a term Node Quorum Rank refers to an integer value that is used to determine whether enough interconnected nodes are online to work. If the sum of the qrank values for node A and all nodes connected to A is more than half of the sum of the qrank values.........【阅读全文】

发布时间：2015-02-15 08:34:03

  eXtremeDB, like other databases, provides indexes for access to objects based on key values. An index definition consists of any combination of scalar fields, structure elements or vector elements from a given class. Indexes can be of various types, the most common of whic.........【阅读全文】

发布时间：2015-02-08 16:13:21

  “Binary schema evolution” (BSE) is a feature that allows an application to alter the database schema of a stored database image to a new definition contained in the dictionary of the currently running application.     Supported schema changes include:&nbs.........【阅读全文】