5、open cursor后要注意close cursor declare--存储域名type t_curisrefcursor; domainNames t_cur; domainNamevarchar2(50) :='';--存储每个域下的网元类型cursormoTypeNames(domainVARCHAR2)ISselectt1.modelnamefrompm4h_mo.mdl_resmodel t1,pm4h_mo.mdl_domain t2wheret2.domainname=domainandt1.domainid=...
游标Cursor逻辑运算符和物理运算符用于描述涉及游标操作的查询或更新的执行方式。 其中物理运算符描述用于处理游标(如使用键集驱动游标)的物理实现算法。 游标执行过程的每一步都涉及物理运算符。 而逻辑运算符描述游标的属性,如游标是只读。 逻辑运算符包括Asynchronous、Optimistic、Primary、Read Only、Scroll Locks、...
参考示例:https://blog.csdn.net/xw1680/article/details/130119856 DELIMITER $$ DROP PROCEDURE IF EXISTS `sp_cursor_test3` $$ CREATE PROCEDURE `sp_cursor_tes
"192.168.0.89:5289"); EXEC SQL WHENEVER SQLERROR DO sql_error("DM error--"); EXEC SQL CONNECT :username IDENTIFIED BY :password USING :servername; printf("\nConnected to dm as user: %s\n", username); /* Declare a cursor for the FETCH. *...
SQL Server 2017 adjusts memory grants based on execution feedback, removes spills to disk, and improves concurrency for repeating queries. Batch mode adaptive joins Adaptive joins dynamically select a better internal join type (nested loop joins, merge joins or hash joins) during...
(),NULL,NULL,NULL,'LIMITED')WHEREavg_fragmentation_in_percent >10.0ANDindex_id >0;-- Declare the cursor for the list of partitions to be processed.DECLAREpartitionsCURSORFORSELECT*FROM#work_to_do;-- Open the cursor.OPEN partitions;-- Loop through the partition...
If you currently use another database management system (DBMS), you can migrate to Microsoft SQL Server. Migrating from another DBMS to SQL Server involves transferring not only the data stored in the DBMS, but the databases and tables that hold the data, and other objects that interact with...
(),NULL,NULL,NULL,'LIMITED')WHEREavg_fragmentation_in_percent >10.0ANDindex_id >0;-- Declare the cursor for the list of partitions to be processed.DECLAREpartitionsCURSORFORSELECT*FROM#work_to_do;-- Open the cursor.OPEN partitions;-- Loop through the partitions.WHILE (1 = 1)BEGIN; FETCH...
1. 安装 SQL Server。我们将要介绍的大多数场景都可以使用 SQL Server Express 执行,但是如果你想要跟随案例研究,你需要使用一个支持代理作业的商业版本。 2. 以系统管理员身份登录到 SQL Server 3. 创建一个最小特权登录 -- Create server login CREATE LOGIN [basicuser] WITH PASSWORD = 'Password123!'; ...
如果你有用过MySQL这些关系型数据库,一定听说过游标(cursor),也用过各种编程语言的JDBC Driver的getNext(),通过这样的方式来每次获取SQL执行结果的一部分数据。Presto提供的类似机制是Query提交后,它会给到SQL客户端一个QueryResult,其中包含一个nextUri。对于某个Query,每次请求QueryResult,都会得到一个新的nextUri,...