为了方便一个共享用户环境(如 web 应用程序)中的客户端的识别,也显示了 CLIENT_ID 列,这可以由DBMS_SESSION.SET_IDENTIFIER 来设置。 既然ASH 信息这么有价值,那么如果以一种类似于 AWR 的永久方式来保存这种信息不是很好吗?幸运的是,它是以这种方式来进行保存的;由 MMON 从进程将信息刷新到 AWR 表中,从而保...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is just...
If you don't name the query blocks in a statement, Oracle will generate query block names for you. To see those names automatically, run an EXPLAIN PLAN on your statement followed by a query using the ALL option of DBMS_XPLAN.DISPLAY: SELECT PLAN_TABLE_OUTPUT FROM TABLE(DBMS_XPLAN.DISPLAY...
data from PDB files into such a DB, the transformation of such data to extract geometrical features. The tools used to face these challenges are the DBMS PostgreSQL and the Python libraries BioPython [22] and DSSP [23]. The technical details and the results of such a phase are reported in...
dbms gate questions compiler design gate questions computer networks gate questions operating system gate questions gate aptitude questions algorithm gate questions c programming gate questions gate articles gate full form isp full form ppp full form ieee full form man full form wlan full form ddr ...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is just...
More information on the DBMS_XPLAN package can be found in the Oracle® Database PL/SQL Packages and Types Reference guide. 6 THE ORACLE OPTIMIZER EXPLAIN THE EXPLAIN PLAN What is Cost? The Oracle Optimizer is a cost-based optimizer. The execution plan selected for a SQL statement is ...