Oracle Database generates an internal SQL statement, which in turn generates a recursive call. In short, recursive calls are basically SQL performed on behalf of your SQL. So, if you had to parse the query, for example, you might have had to run some other queries to get ...
Oracle Database generates an internal SQL statement, which in turn generates a recursive call. In short, recursive calls are basically SQL performed on behalf of your SQL. So, if you had to parse the query, for example, you might have had to run some other queries to get ...
AI代码解释 CREATEORREPLACETYPET_RET_TABLEISTABLEOFVARCHAR2(4000);/CREATEORREPLACEFUNCTIONROW_SPLIT(var_strINSTRING,var_splitINSTRING)RETURNT_RET_TABLEPIPELINEDASvar_tmpCLOB;var_elementCLOB;n_lengthNUMBER:=LENGTH(var_split);BEGINvar_tmp:=var_str;WHILEINSTR(var_tmp,var_split)>0LOOPvar_element:=S...
In a FTS operation, the whole table is read up to the high water mark (HWM). The HWM marks the last block in the table that has ever had data written to it. If you have deleted all the rows then you will still read up to the HWM. Truncate resets the HWM back to the start of...
SQL performed on behalf of your SQL. So, if you had to parse the query, for example, you might have had to run some other queries to get data dictionary information. These would be recursive calls. Space management, security checks, calling PL/SQL from SQL—all incur recursive SQL calls...
SQL_REDIRECT_MISMATCH SQL 重定向不匹配。 MV_QUERY_GEN_MISMATCH 生成物化视图查询。 USER_BIND_PEEK_MISMATCH 用户的 BIND PEEK 不匹配。 TYPCHK_DEP_MISMATCH 游标有类型检查的依赖性。 NO_TRIGGER_MISMATCH 触发器不一致。 FLASHBACK_CURSOR 对于闪回没有游标共享。 ANYDATA_TRANSFORMATION 数据转换有变化。 INCO...
DBMS_OUTPUT.PUT_LINE ('The query did not return a result set'); . Click OK. . Expand Procedures and select PROC_EMP_CURSOR. . Type exc in a new line below END LOOP; Notice that the code template popup appears. Double-click on the code template. . Notice that the code template is...
In some cases you might need to make changes in your workflow definitions, Oracle Application Framework view objects, or PL/SQL procedures to prepare the approval notification content to appear in the app. If so, you should take into consideration how such changes will affect the appearance of ...
图1描述了在SQL编译期中SQL语句的生命周期。在查询优化开始前,SQL引擎需要对SQL语句进行parser、语义分析(Semanic Ayalysis,SA)、类型检查(Type-Check,TC)。Oracle优化器采用了逻辑优化和物理优化相结合的技术,即基于代价的查询优化器,详见[VLDB 06]Cost-based query transformation in Oracle 论文学习。 Oracle查询优...
7. 简单描述一下 nest loop 与 hash join 的差别. 答:nest loop 适用于返回结果比较小的情况. for in 1...n loop 对小表进行遍历 根据小表的结果遍历大表(大表需要索引) end loop hash join 适用在返回大结果集的情况. 8. db file sequential read 与 db file scattered read 等待的差别,如果以上等待...