基本语法是在SQL语句的末尾添加PARALLEL关键字,后面跟一个整数值,表示并行度。取值范围[0,1024],小于2均走串行执行。 语法格式请参见查询语法章节。 示例sql-- 创建表 SQL> CREATE TABLE test_parallel(i1 int) SQL> DECLARE BEGIN FOR i IN 1..3 LOOP INSERT INTO test_parallel VALUES(i); ...
Fordialectandfile, see:Section 5.2.2, “Lakehouse External Table Syntax”. Use one or other of the following, but not both. The use of both parameters will throw an error. columns: An optional JSON array ofcolumn_nameto include in the load. ...
this is set to 10 seconds. Automatic degree of parallelism is only enabled if PARALLEL_DEGREE_POLICY is set to AUTO or LIMITED. The syntax is:
当Oracle数据库启动的时候,实例会根据初始化参数 PARALLEL_MIN_SERVERS=n的值来预先分配n个并行服务进程,当一条SQL被CBO判断为需要并行执行时发出SQL的会话进程变成并行协助进程,它按照并行执行度的值来分配进程服务器进程。 首先协调进程会使用ORACLE启动时根据参数: parallel_min_servers=n的值启动相应的并行服务进程,...
Setzen Siehashexpressionauf einen SQL-Ausdruck (entsprechend der Syntax der JDBC-Datenbankmaschine), der eine ganze Zahl zurückgibt. Ein einfacher Ausdruck ist der Name einer beliebigen numerischen Spalte in der Tabelle. AWS Glue generiert SQL-Abfragen, um die JDBC-Daten parallel zu lesen, inde...
为Parallel Data Warehouse 授予数据库操作的 T-SQL 权限。 授予提交数据库查询的权限 本部分介绍如何向数据库角色和用户授予查询 SQL Server PDW 设备上的数据的权限。 用于授予查询数据权限的语句取决于所需的访问范围。 以下 SQL 语句创建一个名为 KimAbercrombie 的登录名,可在 AdventureWorksPDW2012 数据库中...
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ThePARALLEL_ENABLEclause can appear in the following SQL statements: CREATE FUNCTION Statement CREATE PACKAGE Statement CREATE TYPE BODY Statement Topics Syntax Semantics Related Topics Syntax parallel_enable_clause::= Description of the illustration parallel_enable_clause.eps ...
Oracle mode: Note In Oracle mode, hidden parameters need to be enclosed with double quotation marks (" ") in terms of the syntax. ALTER SYSTEM SET "_parallel_ddl_control" = 'CREATE_INDEX:ON, TRUNCATE_TABLE:OFF'; Previous topic # Parallel DML Next topic # Introduction to parallel...
(In an index operation, the PARALLEL hint is not valid and is ignored.) Additional Information: Refer to Oracle8 Tuning for a general discussion on using hints in SQL statements and the specific syntax for the PARALLEL, NOPARALLEL, PARALLEL_INDEX, CACHE, and NOCACHE hints. ...