近日,一19c oracle rac测试环境,初始反馈是sys用户查询很快,cdb用户如c##any查询系统表如all_tables很慢,至少相差几十倍、有时候直接半天超时还没执行完,经查一开始发现在等待gc cr multi block mixed事件,该事件据官方解释,该事件时提升性能用的,如下: Oracle GC CR Multi Block Mixed 事件是一种用于提高Oracle...
ALL_USER_VIEWS ALL视图描述用户可以访问的视图 USER_views USER视图描述用户所拥有的视图 在oracle中很多视图都是这样来命名的b比如 索引，表空间 等都是这样的，所以记住规律对于以后的学习是很有帮助的。
在任何数据库系统中,有时都需要修改表的逻辑或物理结构以提高查询或 DML 的性能、适应应用程序更改或管理存储。您可以使用DBMS_REDEFINITION 该软件包在线重新定义表。 Oracle 数据库提供了一种机制来修改表结构,而不会显着影响表的可用性。该机制称为在线表重新定义。与重新定义表格的传统方法相比,在线重新定义表格可...
备库第一个节点: LISTENER = (DESCRIPTION_LIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 22.188.194.64)(PORT = 1521)) ) ) SID_LIST_LISTENER = (SID_LIST = (SID_DESC = (SID_NAME = PLSExtProc) (ORACLE_HOME = /oracle/app/oracle/product/11.2.0/db) (PROGRAM = extproc) )...
gsql:Oracle_Functions.sql:1035: NOTICE: -- Compat Object List: gsql:Oracle_Functions.sql:1035: NOTICE: -- === gsql:Oracle_Functions.sql:1035: NOTICE: | type | name | version | language | operation | gsql:Oracle_Functions.sql:1035: NOTICE: |---|---|---|---|---...
You may also choose to use any other character set from the presented list of character sets. You can use this option to select a particular character set required by an application vendor, or choose a particular character set that is the common character set used by all clients connecting ...
Streaming is available in all supported Oracle Cloud Infrastructure regions. For a list, visit the Regions and Availability Domains page. Why should I use Streaming? Streaming is a serverless service that offloads the infrastructure management ranging from networking to storage and the configuration ...
参考资料:How to List the Objects with Stale Statistics Using dbms_stats.gather_schema_stats options=>'LIST STALE' (Doc ID 457666.1) 4:手工验证统计信息是否过旧 通过系统视图DBA_TAB_MODIFICATIONS来判断统计新是否过期。DBA_TAB_MODIFICATIONS使用来记录表的DML操作,依靠里面的信息确定统计信息是否陈旧。确定...
Give your sellers a CRM that matches the way they work. Reps gain efficiency by creating list views with powerful filters. They can change, reorganize, and regroup records however they prefer. Efficient records management Easily update appointments and tasks, complete call logs, assign follow-ups...
With a huge number of views this can take a very long time, you can bypass this ordering by enabling this directive. GRANT_OBJECT When exporting GRANTs you can specify a comma separated list of objects for which privilege will be exported. Default is export for all objects. Here are the ...