zhensolid/obsidian


XE下载	https://www.oracle.com/database/technologies/xe-downloads.html
下载地址	https://www.oracle.com/database/technologies/oracle-database-software-downloads.html#db_free

XE是单实例 CPU 内存闲置

==#Oracle Linux 8== ==预安装【====配置用户和权限以及依赖====】==
dnf install oracle-database-preinstall-19c

==#====安装数据库【====注意必须和预安装匹配====】==
sudo yum localinstall oracle-database-ee-19c-1.0-1.x86_64.rpm

==#====初始配置数据库==
/etc/init.d/oracledb_ORCLCDB-19c configure

==#====使用====cat== ==查看配置日志==
/opt/oracle/cfgtoollogs/dbca/ORCLCDB/ORCLCDB.log

==#L====inux====操作环境配置【====.bash_profile== ==&== ==文件地址不固定】==
export ORACLE_HOME=/opt/oracle/product/19c/dbhome_1
export PATH=$PATH:$ORACLE_HOME/bin

==#linux====配置实例==
export ORACLE_SID=ORCLCDB
==#windows====配置实例==
set oracle_sid=ORCLCDB

==#====连接服务器==
Sqlplus / as sysdba
sqlplus sys@localhost:1521/FREEPDB1 as sysdba

==#====关闭防火墙==
systemctl stop firewalld
systemctl disable firewalld
systemctl status firewalld

==检查防火墙状态，使用以下命令：============sudo firewall-cmd== ==--state========如果防火墙处于活动状态，您需要将端口1521添加到防火墙规则。如果防火墙处于不活动状态，则无需进行任何更改。==
==如果防火墙处于活动状态，添加一个新的防火墙规则以允许通过端口1521的连接，使用以下命令：============sudo firewall-cmd== ==--permanent--zone=====public== ==--add-port=========1521====/tcp== ======这将在"public"区域添加一个永久规则，允许TCP协议的1521端口连接。==
==重新加载防火墙配置，使更改生效：============sudo firewall-cmd== ==--reload========现在，防火墙将允许通过端口1521的连接。==
==#====解锁====system==
alter user system account unlock;

==#====修改====system====密码==
ALTER USER system IDENTIFIED BY "19841122Cy";

==#====查看监听情况==
lsnrctl status ==/start==

==#====查看当前实例名称和状态==
SELECT INSTANCE_NAME, STATUS FROM V$INSTANCE;

#查询所有实例（需要先连接一个实例）
SELECT inst_id, instance_name, host_name, version, status FROM gv$instance;

==#====查看实例用户==
SELECT USERNAME FROM DBA_USERS;

==#====创建用户和密码==
CREATE USER zhensolid01 IDENTIFIED BY 19841122Cy;
==#====分发读取权限==
GRANT CONNECT, SELECT, SELECT_CATALOG_ROLE TO zhensolid;

==#== ==查看保留字母==
SELECT KEYWORD
FROM V$RESERVED_WORDS;

==#====显示当前会话所连接的容器名称==
show con_name;

==#====显示当前数据库中所有的插件式数据库（====PDB====）的信息。==
show pdbs;

==#====打开容器==
ALTER PLUGGABLE DATABASE ==ORCLPDB1== OPEN;

==#====切换容器==
ALTER SESSION SET CONTAINER = ==ORCLPDB1==;

#查看容器信息
SELECT NAME, CON_ID, DBID, GUID, OPEN_MODE FROM V$CONTAINERS WHERE NAME = =='ORCLPDB1'==;