数据库的sort group by和hash group by
Oracle数据库中的GROUP BY操作是对查询结果进行分组的方式。在Oracle中,有两种主要的分组方法:Sort Group By 和 Hash Group By。它们之间的区别主要在于执行策略和性能。Sort Group By:Sort Group By 是一种基于排序的分组方法。在此方法中,Oracle首先对输入数据进行排序,然后在排序后的数据上执行分组操作。这种方法需要额外的排序操作,
PL/SQL package SYS.DBMS_BACKUP_RESTORE version 19.16.00.00 in TARGET database is
PL/SQL package SYS.DBMS_BACKUP_RESTORE version 19.16.00.00 in TARGET database is not current PL/SQL package SYS.DBMS_RCVMAN version 19.16.00.00 in TARGET database is not current
ORA-00600: internal error code, arguments: [knacpft_ProcessFetchedTxns250]
当前数据库版本xstream停掉了XStream Apply Reader AS01 for DBZXOUT22 with pid=154 OS id=36804 stopped XStream Apply Server AS02 for DBZX
Oracle常用抓取SQL-标量子查询等
抓标量自查询等等
v$archive_dest dataguard ORA-00439: feature not enabled
记一次乌龙
Oracle 19.16 benchmarksql 下压测
为了客观反映信息,步骤略详细…使用benchmarksql压测Oracle19c操作系统基础信息操作系统[root@machine199 ~]# cat /etc/system-release CentOS Linux release 7.9.2009 (Core)内存信息[root@machine199 ~]#&n
Oracle 最新PSU (Doc ID 2118136.2)
Assistant: Download Reference for Oracle Database/GI Update, Revision, PSU, SPU(CPU), Bundle Patches, Patchsets and Base Releases (Doc ID 2118136.2)
Oracle 下载最新psu (Doc ID 2118136.2)
Assistant: Download Reference for Oracle Database/GI Update, Revision, PSU, SPU(CPU), Bundle Patches, Patchsets and Base Releases (Doc ID 2118136.2)
Oracle的null和空串【一切有为法,如梦幻泡影 】
'' 和null逻辑等价,oracle不会去做 = null的判断,null没有长度,不能做比较,只能说是或者不是空,一切有为法,如梦幻泡影
Release Schedule of Current Database Releases (Doc ID 742060.1)
Autonomous Database Dedicated - Version NA and laterAutonomous Database on Shared Infrastructure - Version N/A and laterOracle Database Cloud Service - Version N/A and laterOracle Database Cloud Exada
Bug 27223075 - Wait for 'PX Deq: Join Ack' when no active QC but PPA* slaves sho
记录一下今天遇到的问题
Oracle Error:emcp:EKBL043: emcp_pseudo_ctl_ioctl: Invalid cmd 0xxxxxx, proc name
一套Oracle 12.2.0.1环境的RAC,在1月4日的时候发生了集群重启【重启原因和下面没关系,我们只是说下emcp_pseudo_ctl_ioctl错误哦!!~】在/var/log/message显示如下报错ecmp_pseudo_ctl_ioctl错误,那么这个错误是什么?是否对我的数据库有影响?或者说是潜在的io错误吗?我们带着这样的疑问来看下。Jan 4 10:1
ORA-00600: internal error code, arguments: [qosdExpStatRead: expcnt mismatch], [
expdp导出报错!!打完补丁记着要开启ORA-00600: internal error code, arguments: [qosdExpStatRead: expcnt mismatch], [65969], [433], [85888], [1], [], [], [], [], [], [], []----------I confirmed there are two bugs to m
Oracle SQL_ID转换成SQL_HASH_VALUE
SQL_ID转换成SQL_HASH_VALUE
OP code汇总
Layer 1 : Transaction Control - KCOCOTCT Opcode 1 : KTZFMT Opcode 2 : KTZRDH
常见工具、文档链接
常见工具、文档链接
Oracle 字符集从GBK升级到Utf8
1、导出前准备(单实例单监听) a.关闭zabbix 监控 配置--主机--primary-new-qpdbb.停应用停监听杀会话lsnrctl stop LISTENER杀会话:export ORACLE_SID=qpprips -ef|grep $ORACLE_SID|grep -v ORA_|grep LOCAL=NO|awk '{prin
alter database disable thread 2
rac改单机
linux简易 Oracle客户端安装和下载地址
oracle-instantclient11.2-basic-11.2.0.4.0-1.x86_64.rpm oracle-instantclient11.2-jdbc-11.2.0.4.0-1.x86_64.rpm oracle-instantclient11.2-sqlplus-11.2.0.4.0-1.x86_64.rpm
Oracle blob类型数据转换成 base64编码
需求大概是这样的base64编码列表的Json格式字符串,图片文件格式是jpg,形如:"[{"employ_files": "/9j/4AAQSkZJRgABAQEAYABgAAD"},{"employ_files": "/9j/4AAQSkZJRgABAQEAYABgAAD"}]&quo