一、adump目录数据暴增现象
发现某台数据库服务器的根目录的使用率在暴涨,发现Oracle数据库的adump目录,每秒生成一个dump文件。数据库并未开通审计外部记录。为什么adump目录会生成那么多的dump文件?
抽取其中的某个adump文件,文件内容如下:
可以看到,某进程用sysdba登录
二、adump目录相关说明
从网上找到关于sysdba或者sysoper与adump目录的关系:
每次sysdba或者sysoper权限登录都会写入一个audit trail文件或者在现有的trail文件后面添加登录信息。而这个并不受audit_trail参数限制,audit_trail是显示是否启用审计和审计内容存储的具体位置
有关audit_sys_operations参数:
AUDIT_SYS_OPERATIONS enables or disables the auditing of top-level operations, which are SQL statements directly issued by users when connecting with SYSDBA or SYSOPER privileges. (SQL statements run from within PL/SQL procedures or functions are not considered top-level.) The audit records are written to the operating system's audit trail. The audit records will be written in XML format if the AUDIT_TRAIL initialization parameter is set to xml or xml, extended.
On UNIX platforms, if the AUDIT_SYSLOG_LEVEL parameter has also been set, then it overrides the AUDIT_TRAIL parameter and SYS audit records are written to the system audit log using the SYSLOG utility.
该参数默认为false,但是sysdba和sysoper登录还是会记录audit到相应的audit trail文件的,只是不记录之后sysdba操作的信息,而如果设置true,还会记录之后sysdba或者sysoper操作记录到audit trail中。
可以关闭审计,但是sysdba或者sysoper登录记录audit trail却无法禁掉。
# sqlnet.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.
整理自:https://blog.csdn.net/zhaoyangjian724/article/details/50637409