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...
select * from user_tab_comments -- 查询本用户的表,视图等 select * from all_col_comments --查询所有用户的表的列名和注释. select * from user_col_comments -- 查询本用户的表的列名和注释 select * from all_tab_columns --查询所有用户的表的列名等信息(详细但是没有备注). select * from user_...
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。
gsql:Oracle_Functions.sql:1035: NOTICE: | result_type | case_count | start_time | complete_time | gsql:Oracle_Functions.sql:1035: NOTICE: |---|---|---|---| gsql:Oracle_Functions.sql:1035: NOTICE: | PASSED | 387 | 2021-11-25 09:42:20.016619 | 2021-11-25 09:42:52.127892 |...
不翻译了哈 亲 那列不懂单问吧 太多了 就是ORACLE存放所有表信息的视图。ALL_TABLES ALL_TABLES describes the relational tables accessible to the current user. To gather statistics for this view, use the ANALYZE SQL statement.Related Views DBA_TABLES describes all relational tables in the...
2. 然后通过ipaddress,tnsname从oraclelist数据库中查找获得用户名密码用于连接 3.再判断命令内容,如果是check_process_text则首先获取进程号码(pid)并连接起来 4. 在执行函数getprocesstext获取相关SQL信息 这里之所以用hash_value是因为我有9i的库 5. 这里的getprocesstext函数获取Oracle 信息,包括SID,HASH_VALUE,LO...
2.1 Alphabetic List of SQLcl Commands @{url | file_name[.ext]} [arg ...] @@ { url | file_name[.ext] } [arg ...] / (slash) ACC[EPT] variable [NUM[BER] | CHAR | DATE | BINARY_FLOAT | BINARY_DOUBLE] [FOR[MAT] format] [DEF[AULT] default] [PROMPT text | NOPR[OMPT]...
Using objects known as rollback segments, Oracle constructs read-consistent views of data as of the point in time a SQL statement is issued. A "snapshot too old" error might occur when rollback information is overwritten by other concurrent sessions. Prior to Oracle 9i, the recommended method...
executing Memory Script sql statement: alter system set db_unique_name = ''TESTDGPHY'' comment= ''' scope=spfile sql statement: alter system set log_archive_dest_1 = ''LOCATION=/arch valid_for=(ALL_LOGFILES,ALL_ROLES) db_unique_name=TESTDGPHY'' comment= ''' scope=spfile sql statement...
Currently, you can connect to an Oracle Autonomous Database from Excel, Power BI Desktop, Power BI service, Fabric (Dataflow Gen2), Power Apps, SQL Server Analysis Services, and BizTalk Server using the procedures in this section. These tools use unmanaged ODP.NET to connect. Other Microsoft...