是的,select failure_scn from v$database;在mount模式下可以执行。前提是用户具有足够的权限来查询v$database视图。在MOUNT状态下,这个查询将返回数据库最近一次故障时的SCN(如果有的话),或者在没有故障的情况下返回相应的默认值或NULL。 示例 假设用户有足够的权限,并且数据库当前处于MOUNT状态,你可以通过以下SQL命...
获取当前SCN的方式非常多,除了使用DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER函数外,也可以通过查询V$DATABASE视图中的CURRENT_SCN列获取。不过,不管是通过查询视图,或是通过过程获取,操作的用户都必须拥有要操作对象的访问权限。 例如,授予用户使用DBMS_FLASHBACK包的权限: 1. JSSPRE> CONN/AS SYSDBA 2. Connected. ...
When both clauses are used together, the AS OF clause determines the SCN or moment in time from which the database issues the query. The VERSIONS clause determines the versions of the rows as seen from the AS OF point. The database returns null for a row version if the transaction start...
You executed the following query in your database: SELECT oldest_flashback_scn, oldest_flashback_time FROM V$FLASHBACK_DATABASE_LOG; What would you determine from the output?()A. The time
When both clauses are used together, theASOFclause determines the SCN or moment in time from which the database issues the query. TheVERSIONSclause determines the versions of the rows as seen from theASOFpoint. The database returns null for a row version if the transaction started before the...
The ABAP Managed Database Procedures (AMDP) framework provides the higher level of integration of the advanced HANA capabilities into ABAP applications. It allows creating and managing SQLScript-based DB procedures from the ABAP platform by using so called AMDP methods....
This technique is very flexible, allowing you to perform joins, set operations, subqueries, and views using different date/time or SCN settings for each table in the query. You can also restore or capture past data by using a Flashback Query inside an INSERT or CREATE TABLE AS SELECT ...
A different system change number or timestamp for each object in the select list, using the clauses VERSIONS BETWEEN { SCN | TIMESTAMP } or VERSIONS AS OF { SCN | TIMESTAMP }. You can also implement session-level Flashback using the DBMS_FLASHBACK package. A valid time period for eac...