–Top Activity: Analyzes the top SQL statements currently active –SQL Tuning Sets: Analyzes a set of SQL statements you provide –Historical SQL (AWR): Analyzes SQL statements from statements collected by AWR snapshots 使用SQL优化顾问 •使用SQL优化顾问分析SQL语句并获得性能建议。 •供SQL优化顾问...
SQL> alter system set db_files=500 scope=spfile; Shutdown the database with immediate option and restart so that the new value for db_files can be read. SQL> shutdown immediate SQL> startup Check the new value for db_files parameter SQL> show parameter db_files; NAME TYPE VALUE --- ...
This Oracle tutorial explains how to use the OracleINSERT statementwith syntax and examples. We've also added some practice exercises that you can try for yourself. Description The Oracle INSERT statement is used to insert a single record or multiple records into a table in Oracle. Syntax The ...
SQL> create user bjbbs identified by passwd 2 default tablespace bjbbs 3 temporary tablespace temp 4 / User created. SQL> grant connect,resource to bjbbs; Grant succeeded. SQL> grant dba to bjbbs; Grant succeeded. SQL>revoke unlimited tablespace from bjbbs; Revoke succeeded. SQL> alter user bj...
高负载SQL语句:是否有任何SQL语句正在消耗过多的系统资源? 高负荷的PL/SQL的执行和编译,和高负荷的java使用? Oracle RAC问题:全局缓存热块和对象是什么;有任何互连延迟的问题? 应用程序最优使用Oracle数据库:如糟糕的连接管理,过度解析析,或应用程序级锁争的问题吗?
Using a Cursor to Execute Statements AgainAfter each stage of execution, the cursor retains enough information about the SQL statement to re-execute the statement without starting over, as long as no other SQL statement has been associated with that cursor. This is illustrated in Figure 7-1. ...
Typically, using bulk binds improves performance for SQL statements that affect four or more database rows. The more rows affected by a SQL statement, the greater the performance gain from bulk binds. 注意: Parallel DML statements are disabled with bulk binds and bulk SQL. ...
Oracle / PLSQL:SELECT Statement This Oracle tutorial explains how to use the OracleSELECT statementwith syntax, examples, and practice exercises. Description The Oracle SELECT statement is used to retrieve records from one or more tables in an Oracle database. ...
-- 是否允许单条sql 返回多个数据集 (取决于驱动的兼容性) default:true --><setting name="multipleResultSetsEnabled" value="true"/><!-- 是否可以使用列的别名 (取决于驱动的兼容性) default:true--><setting name="useColumnLabel" value="true"/><!--允许JDBC 生成主键。需要驱动器支持。如果设为...
SQL> select 1 from dual@dblinkB; 1 --- 1 SQL> 如视图或存储过程中使用了两个DBLINK就会报错,如类似如下报表查询想放在ADG上执行以减轻主库的性能压力,就会报错ORA-16000: database open for read-only access: CREATE OR REPLACE FORCE VIEW "test"."T_REPORT" (………) AS select from test.test_...