Recursive SQL概念:有时为了执行用户发出的一个sql语句,Oracle必须执行一些额外的语句,我们将这些额外的语句称之为''recursive calls''或''recursive SQL statements''.如当一个DDL语句发出后,ORACLE总是隐含的发出一些recursive SQL语句,来修改数据字典信息,以便用户可以成功的执行该DDL语句。当需要的数据字典信息没有...
id=2 :执行计划的行源号 cnt=3 :当前行源返回的行数 pid=1 :当前行源号的父号 pos=1 :执行计划中的位置 obj=0 :当前操作的对象id(如果当前行原始一个对象的话) op=’NESTED LOOPS :当前行源的数据访问操作 本文参与 腾讯云自媒体同步曝光计划,分享自作者个人站点/博客。 原始发表:2016/12/14 ,如有侵...
NESTED={YES | NO} YES YESの場合は、ネストしたプログラムをサポート NLS_CHAR=(var1, ..., varn) なし マルチバイト文字変数の指定します。 NLS_LOCAL={YES | NO} NO YESの場合は、Pro*COBOLの旧リリースのNCHAR方法を使用します。 OBJECTS={YES | NO} YES オブジェクト・タイプ...
The row_prefetch will be turned back to 1 automatically by the driver if any of the select-column types is streaming (long data or long raw data). This is overrides any value the user might set. Also, this will be done regardless of wether the streaming columns are read or not. ...
添加了对在 PL/SQL 块中报告用户定义类型(包括子类型、VARRAY、NESTED TABLE、对象表和对象视图),以及它们的使用情况和特别错误消息的支持。 2010 年 7 月 SSMA for Oracle 的 2010 年 7 月版本添加了: 支持迁移到 SQL Server 2008 R2。 用于命令行执行的新 SSMA 控制台应用程序。 支持使用服务器端和客户端...
Some examples are nested loop, sort merge, hash, and star transformation. 3.DDL statements Some examples are CREATE TABLE AS SELECT, CREATE INDEX, REBUILD INDEX, REBUILD INDEX PARTITION, and MOVE/SPLIT/COALESCE PARTITION. 含有LOB字段的表无法使用DDL 并行技术(One important restriction is that parall...
nested tables, 13-12 object tables, 13-8, 13-12 locks, 24-30 parallelism, 23-32 index-organized tables, 23-31 partition attributes, 11-26 storage parameters, 4-18 triggers, 19-7 CREATE TABLESPACE statement TEMPORARY clause, 3-13 CREATE TEMPORARY TABLE statement, 10-11 CR...
types and objects into prepared statements, and methods to support Oracle performance extensions on a statement-by-statements basis. About prepared statements : To write changes to the database, such as for INSERT or UPDATE operations, you will typically create a PreparedStatement object. This allo...
To improve the optimization of SQL statements, Oracle introduced the cost-based optimizer in Oracle7. As the name implies, the cost-based optimizer does more than simply look at a set of optimization rules; instead, it selects the execution path that requires the least number of logical I/O...
The syntax for table name in theSELECTstatement allows optional parenthesis. This is also true for theSELECTclause of theINSERT...SELECTandCREATETABLEASSELECTstatements. SeeOracle TimesTen In-Memory Database SQL Referencefor more details. Setting theCacheCommitDurablecache configuration parameter to0with...