1. SQL编译器(SQL Compiler) 将语句编译到一个共享游标中。SQL编译器由解析器(Parser)、查询优化器(Query Optimizer)和行源生成器(Row Source Generator)组成。 (1)解析器(Parser)—执行对SQL语句的语法、语义分析,将查询中的视图展开、划分为小的查询块。 (2)查询优化器(Query Optimizer)—为语句生成一组可能...
The Oracle backend SQL compiler is adding outer pagination selects when calling queryset.get causing parsing failures with select_for_update. Using Django 1.7 rc 1 on Python 3.4.0 Windows 7. Can also reproduce with Django 1.7 rc 1 on Python 3.4.1 Centos 6.5. Easy to reproduce with a simp...
可以通过v$sqlarea 和 v$sql 视图来查新相关信息,v$sqlarea是父游标相关信息视图,v$sql是子游标的。 如: select sql_id,version_countfromv$sqlarea order by 2 desc ; select address,child_address,sql_textfrom v$sqlwheresql_id='70th7d08hqjf7'; v$sql中通过child_number,hash_value,address来确定一个子游...
PLSQL_CODE_TYPE, rather than being one of several options inthe PLSQL_COMPILER_FLAGS parameter, which is now deprecated.Thespnc_commands file, located in the ORACLE_HOME/plsqldirectory, contains the commands and options
关联complier,linker 的参数已经过期。Native compilation 通过一个PLSQL_CODE_TYPE 参考来控制启动和关闭。 在10g 之前是使用PLSQL_COMPILER_FLAGS参数。 spnc_commands 文件存在ORACLE_HOME/plsql 目录下。如: [oracle@rac1plsql]$ pwd /u01/app/oracle/product/10.2.0/db_1/plsql ...
SQL compiler在处理sql query时会读取sql语句中涉及的元数据,以及where语句涉及的column的统计信息。 查询计划(cursor)缓存,在run-time期间,个人理解,Oracle将cursor缓存到共享内存中,建立了sql文本、cursor编译时的上下文(如table、index元数据)、用户的权限信息等三维要素与cursor的map,每次使用时,需要根据cursor编译时...
PL/SQL Developer Save time and money on your PL/SQL Development The following are major features of PL/SQL Developer Powerful PL/SQL Editor With its Syntax Highlighting, SQL and PL/SQL help, Object Descriptions, Code Assistant, Compiler Hints, Refactoring, PL/SQL Beautifier, Code Contents, ...
Increase user productivity and query efficiency by including user-written PL/SQL functions in SQL expressions as described in "Calling Stored Functions from SQL Expressions". Create explicit cursors when writing a PL/SQL application. When writing precompiler programs, increasing the number of cursors ...
As you're coding, problems will be immediately detected via our PL/SQL and SQL Parser. Compiler errors are also automatically displayed as you save your work to the database. When it's time to test or execute your program, SQL Developer provides an interactive panel where you can input the...
*/ EXEC SQL CONNECT :username IDENTIFIED BY :password; puts("\nConnected to Oracle.\n"); /* Assign a SQL query to the VARCHAR dynstmt. Both the * array and the length parts must be set properly. Note * that the query contains one host-variable placeholder, * v1, for which an ...