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SQL CURSOR

SET NOCOUNT ON; DECLARE @vendor_id int, @vendor_name nvarchar(50), @message varchar(80), @product nvarchar(50); PRINT '-------- Vendor Products Report --------'; DECLARE vendor_cursor CURSOR FOR SELECT VendorID, Name FROM Purchasing.Vendor WHERE…

Use Cursor

declare : CURSOR cursor_name IS select_statement ; open : OPEN cursor_name if the query returns no rows when the cursor is opened , PL/SQL does not raise an exception . However , you can test the status of the cursor after a fetch using the SQL%ROWCO…

Rolling Cursor Invalidations with DBMS_STATS.AUTO_INVALIDATE (文档 ID 557661.1)

Rolling Cursor Invalidations with DBMS_STATS.AUTO_INVALIDATE (文档 ID 557661.1) 转到底部 In this Document Purpose Scope Details Cursor Invalidations on Gathering Statistics prior to Oracle10g Cursor Invalidations with Oracle10g and AUTO_INVALID…

Cursor: Pin S Wait On X In The Top 5 Wait Events

Wait Events , Posted in: Technical Track Tags: Group Blog Posts, Oracle, Technical Blog Lately, wait events %! So what exactly is the root cause? Why is so much time spent waiting on a busy mutex when it should protect just one cursor? As a troublesh…

DECLARE CURSOR (Transact-SQL)

Defines the attributes of a Transact-SQL server cursor, such as its scrolling behavior and the query used to build the result set on which the cursor operates. DECLARE CURSOR accepts both a syntax based on the ISO standard and a syntax using a set of…

Resource Access Based on Multiple Credentials

A collection of multiple user credentials each associated with one of multiple different users is obtained at a device, and one or more of the multiple user credentials are verified. A determination is made as to whether access to a resource is permi…

Oracle 11g 新特性 -- 自适应游标共享(Adaptive Cursor Sharing： ACS) 说明（转载）

一．自适应游标共享(Adaptive Cursor Sharing) 说明 1.1 ACS概述绑定变量使Oracle DB 可以为多条SQL 语句共享单个游标,以减少分析SQL 语句所使用的共享内存量.然而,游标共享和SQL 优化是两个相互冲突的目标.用文字编写SQL 语句为优化程序提供了更多的信息,这无疑会导致更好的执行计划,但大量的硬分析会导致内存和CPU 开销增加. Oracle9i Database首次尝试推出了一个折衷的解决方案:允许共享使用不同文字值的相似SQL 语句.对于使用绑定变…