oracle数据库的相关内容

文章 2022-07-07 来自：开发者社区

oracle 数据库在线重做日志故障处理

1 数据库环境1.1 数据库版本SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64....

文章 2022-07-04 来自：开发者社区

oracle-变更-表变更导致数据库对象失效问题处理

需求**表变更导致数据库对象失效问题处理**导致数据库对象失效的原因：An INVALID Object problem may arise due to: Due to any patch installation. Database/Application level up-gradation DDL Changes1. 查看需要变更的表所关联的存储过程、视图等对象...

文章 2022-06-30 来自：开发者社区

SQL Developer 连接 oracle数据库报错 Io 异常 The Network Adapter could not establish the connection的三种解决方法

报错 Io 异常: The Network Adapter could not establish the connection的三种解决方法Io 异常: The Network Adapter could not establish the connection这个异常的出现一般与数据库和你的PC的设置有关这种异常的出现大致上有下面几种：1。IP错误。在设置URL时错误，例如：jdbc:ora....

问答 2022-06-27 来自：开发者社区

咨询一个oracle cdc的问题，如果只要同步某几张表也还要开启数据库级别的最小补充日志么？

文章 2022-06-21 来自：开发者社区

oracle-troubleshooting- 如何通过 dba_hist_active_sess_history 分析数据库历史性能问题

如何通过 dba_hist_active_sess_history 分析数据库历史性能问题背景在很多情况下，当数据库发生性能问题的时候，我们并没有机会来收集足够的诊断信息，比如system state dump或者hang analyze，甚至问题发生的时候DBA根本不在场。这给我们诊断问题带来很大的困难。那么在这种情况下，我们是否能在事后收集一些信息来分析问题的原因呢？在Oracle 10G....

文章 2022-06-21 来自：开发者社区

oracle-troubleshooting- 如何通过 v$active_session_history 分析数据库历史性能问题

适用于Oracle 10G或更高版本的单机，本文适用于任何平台。详情- Active Session: on the CPU or was waiting for an event that didn't belong to the Idle wait class - 在Oracle 10G中，我们引入了AWR和ASH采样机制，有一个视图gv$active_session_history会每秒....

文章 2022-06-21 来自：开发者社区

不得不会的Oracle数据库知识点（四）

一．使用PL/SQL可用于创建存储过程，触发器，程序包，给SQL语句的执行添加程序逻辑。支持SQL，在PL/SQL中可以使用：数据操纵命令事务控制命令游标控制SQL函数和SQL运算符支持面向对象编程(OOP)可移植性更佳的性能，PL/SQL经过编译执行分为三个部分：声明部分，可执行部分和异常处理部分[declare declarations] begin executable statement....

文章 2022-06-21 来自：开发者社区

不得不会的Oracle数据库知识点（三）

锁和数据库对象1.锁数据库用来控制共享资源并发访问的机制。锁的类型：行级锁，表级锁。行级锁：对正在被修改的行进行锁定。行级锁也被称之为排他锁。在使用下列语句时，Oracle会自动应用行级锁：insert,update,delete,select…… for updateselect……for update允许用户一次锁定多条记录进行更新。使用commit or rollback释放锁。表级锁：l....

文章 2022-06-21 来自：开发者社区

不得不会的Oracle数据库知识点（二）

SQL查询和SQL函数1.SQl支持的命令：数据定义语言（DDL）:create,alter,drop数据操纵语言（DML）:insert,delete,update,select数据控制语言（DCL）:grant,revoke事务控制语言（TCL）:commit,savepoint,rollback2.Oracle数据类型字符，数值，日期，RAW，LOB字符型char:1-2000字节的定长字....

文章 2022-06-21 来自：开发者社区

不得不会的Oracle数据库知识点（一）

前言：ORACLE支持五种类型的完整性约束NOT NULL (非空)--防止NULL值进入指定的列,在单列基础上定义,默认情况下,ORACLE允许在任何列中有NULL值.CHECK (检查)--检查在约束中指定的条件是否得到了满足.UNIQUE (唯一)--保证在指定的列中没有重复值.在该表中每一个值或者每一组值都将是唯一的.PRIMARY KEY (主键)--用来唯一的标识出表的每一行,并且防....

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数据库审计

满足等保2.0二级和三级 “安全审计”合规要求的同时，智能解析数据库通信流量，细粒度审计数据库访问行为，通过对数据库全量行为的审计溯源、危险攻击的实时告警、风险语句的智能预警，提供数据库资产最安全的监控保障。

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