数据虚拟化系统 Teiid 7.5 正式版发布

     <p>Teiid是一个数据虚拟化系统，让应用程序使用来自多个异构数据存储的数据。</p>    <p>Teiid由一堆工具，组件和创建和执行双向数据的服务所组成。通过抽象和联合、数据存取和集成的实时分布式数据源，无需进行复制或以其他方式移动数据系统的纪录。<br /> <img title="12092710_rmu3.png" border="0" alt="12092710_rmu3.png" src="https://simg.open-open.com/show/21407a9804b25026a15c41429e988050.jpg" /><br /> <br /> <strong>项目地址：</strong><a href="/misc/goto?guid=4958183978056190836"><strong>http://www.jboss.org/teiid</strong></a><br /> <br /> Teiid 7.5 正式版发布了，该版本值得关注的特性有：<br /> </p>    <ul>     <li><strong>Window function support</strong> - Teiid and pushdown support was added for SQL 2003 OLAP window functions. The analytical ranking functions RANK, DENSE_RANK, and ROW_NUMBER were also added. See the reference for more.</li>     <li><strong>Additional ANSI support</strong> - Teiid and pushdown support was added for SUBSTRING using FROM/FOR syntax, TRIM, EXTRACT, SIMILAR TO, and LIKE_REGEX. See the reference for more.</li>     <li><strong>Subquery optimization control</strong> - added the DJ hint to indicate that a subquery should be the independent side of a dependent join.</li>     <li><strong>MAKEIND Hint</strong> - The MAKEIND hint can be used to indicate that the other side of the join should be made dependent.</li>     <li><strong>ODBC SSL</strong> - added support for SSL encrypted ODBC connections.</li>     <li><strong>Reauthentication Statement</strong> - SET SESSION AUTHORIZATION can now be used to perform a reauthentication via JDBC or ODBC.</li>     <li><strong>Pluggable Authorization</strong> - an alternative PolicyDecider can be defined in the teiid-jboss-beans.xml file to customize authorization decisions.</li>     <li><strong>Streaming XQuery</strong> - in situations where document projection applies if the XMLQUERY/XMLTABLE path expressions meet certain conditions, then the incoming document will not only be projected, but the independent subtrees will be processed without loading the entire document. This allows for nearly arbitrarily large XML documents to be processed. See the Reference for more.</li>     <li><strong>Logging Procedures</strong> - added SYSADMIN.isLoggable and SYSADMIN.logMsg to aid in debugging procedure logic.</li>     <li><strong>ANSI OFFSET/FETCH FIRST</strong> - instead of the limit clause, a standard OFFSET and/or FETCH FIRST/NEXT clause can be used to limit results.</li>     <li><strong>ODBC Cursors</strong> - added the capability to use "UseDeclareFetch" with ODBC. This enables users to read results in batches, which is especially useful when dealing with large row counts.</li>     <li><strong>Internal Materialized Views</strong>      <ul>       <li><strong>Distributed Refresh</strong> - When a internal materialized view is refreshed at one node, an event is issued to all other nodes in the cluster to asynchronously fetch the new contents.</li>       <li><strong>Sync at Start</strong> - When a node is restarted in a cluster, at end of start cycle Teiid will asynchronously fetch the cached internal materialized view contents from other nodes.</li>      </ul> </li>     <li><strong>LDAP Pagination</strong> - the ldap translator now supports pagination for retrieving large results from directory servers like Active Directory and OpenLDAP.</li>    </ul>    <p>同时还修复了大量的问题，下载地址：<a href="/misc/goto?guid=4958185782113537863">Download</a></p>