Theadaptive cursor sharing feature enables a singlestatement that contains bind variables to use multiple execution plans.Cursor sharing is "adaptive" because the cursor adapts its behaviorso that the database does not always use the same plan for each execution orbind variable value. Forappropriate ...
Oracle Bind Variable(绑定变量)就其本质来说就是把本来需要Oracle做硬解析的SQL变成了软解析,以减少Oracle花费在SQL解析上的时间和资源。 我们设想一个银行ATM机系统,这是一个比较典型的OLTP系统,用户分别在不同的ATM机上做操作,其实所有的用户做的操作基本上是相同的,主要是这样3种,查询,取款,存款。 对于查询,...
Sql*plus中使用绑定变量: sql> variable x number; sql> exec :x := 123; sql>SELECT fname, lname, pcode FROM custWHERE id =:x; pl/sql pl/sql很多时候都会自动绑定变量而无需编程人员操心,即很多你写得sql语句都会自动利用绑定变量,如下例所示: create or replace procedure dsal(p_empno in number...
oracle绑定变量（bindvariable）oracle绑定变量（bindvariable）oracle 绑定变量(bind variable)oracle 中，对于⼀个提交的sql语句,存在两种可选的解析过程, ⼀种叫做硬解析,⼀种叫做软解析.⼀个硬解析需要经解析,制定执⾏路径,优化访问计划等许多的步骤.硬解释不仅仅耗费⼤量 的cpu，更重要的是会占据重要的...
BIND_VARIABLE 存储过程用于绑定参数,每次调用为一个参数绑定一个值,多个参数需要调用多次。 DBMS_SQL 解析的语句中,参数是带名字的,BIND_VARIABLE 操作也通过名字绑定。 功能适用性 该内容仅适用于 OceanBase 数据库企业版。OceanBase 数据库社区版仅提供 MySQL 模式。 语法 DBMS_SQL.BIND_VARIABLE(cursor_id IN IN...
一. Oracle 11gR2官网的说明 http://download.oracle.com/docs/cd/E11882_01/server.112/e16638/optimops.htm 1.1 Bind Variable Peeking Inbindvariable peeking (also known as bind peeking), the opt ...
其实,只需将以上java 代码改成以下这样,就使用了oracle 的绑定变量: String v_id = 'xxxxx'; String v_sql = 'select name from table_a where id = ? '; //嵌入绑定变量 stmt = con.prepareStatement( v_sql ); stmt.setString(1, v_id ); //为绑定变量赋值 ...
Unless Oracle are doing something underhand - which I'm not offering as a serious possibility! The good plans read 8 rows from BATCHES using an index lookup, the bad plan does a full scan of 13,478,003 rows. Given that the one, singular bind variable is identical in each case, the ...
Posted in Performance | Leave a Comment » Tags: bind variable, GATHER_PLAN_STATISTICS, kerry osborne February 24, 2011 Identifying SQL which are not using bind variables The scripits are offered by TOM KYTE at http://asktom.oracle.com/pls/asktom/f?p=100:11:997948425446896:::P11_QU...