在oracle 12c之前,收集直方图信息是相对比较耗费资源的,因为要重复扫描几次:在oracle 12c中,则有较大的提升,具体可参考https://jonathanlewis.wordpress.com/2013/07/14/12c-histograms/. There are a few enhancements in 12c that might make a big difference to performance for a small investment in effort.
目录: 一.前言 二.使用普通用户 三.自动启动PDB 一.前言 最近电脑上安装了oracle 12c数据库,想体验下新特性.安装完后,便像11g一样在dos窗口进行下面的操作: SQL Production :: Copyright (c) , , Oracle. All rights reserved. 连接到: Oracle - 64bit Production With the Partitioning, OLAP, Advanced Analytics and Real Applica
今天初次使用java连接Oracle 12c,遇到各种问题,为方便后续查询,在汇总了问题记录及解决方案如下. ORA-28040: No matching authentication protocol 需要在 ...\product\12.1.0\dbhome_1\NETWORK\ADMIN\sqlnet.ora 文件中加入 SQLNET.ALLOWED_LOGON_VERSION=8 ORA-12505: TNS:listener does not currently know of SID