Oracle<em>认证</em>专家证书是衡量人们具备Oracle相关知识与技能的最高标志，拿到了Oracle<em>认证</em>证书，不仅仅增强了个人的自信心和提高了求职能力，而对企业而言，如果有员工拿到Oracle<em>认证</em>证书，不仅能增加企业的声誉，而且能增强企业解决问题的能力。如果您想成为Oracle DBA，有了证书就能证明您能胜任这份工作！或者可以说它就是你的一张求职的通行证！ Oracle<em>认证</em>目前分为三个层次OCA、OCP、OCM。OCA即Oracle Certified As
User A executes this command:
SQL&gt; ALTER TABLE oe.trans MOVE TABLESPACE tbs2;
While this is executing, user B executes this command:
SQL&gt; DELETE FROM oe.trans WHERE tr_type='SL';
View the Exhibit and examine the commands used to create two tables. You wish to insert data into the child table before parent table. Which two actions would avoid errors when inserting a row into th...
1. A simple master-to-slave replication is currently being used. The following information is extracted from the SHOW SLAVE STATUS output:
Last_SQL_Error: Error 'Duplicate entry '8' for key 'PRIMARY''...
Java recently celebrated its 20th birthday, since it was “born” in 1995. As with anything
20 years old, there is a good amount of history and variation between different versions of
Java. Over the years, the certification exams have changed to cover different topics. The
names of the exams have even changed. This book covers the Java 8 OCP exam along with
the upgrade exams to Java 8.
If you read about the exam on the web, you may see information about the older
names for the exam. The name changes are shown in Figure I.1. Here’s what happened.
Back when Sun Microsystems owned Java, they used to have two exams. The SCJA (Sun
Certified Java Associate) was meant for new programmers and the SCJP (Sun Certified Java
Programmer) was meant for those who wanted broader knowledge. When Oracle bought
Sun Microsystems, they renamed all of the exams from Sun to Oracle, giving us the OCJA
(Oracle Certified Java Associate) and OCJP (Oracle Certified Java Programmer).
You execute this command.
SQL&gt; DROP TABLE scott.item CASCADE CONSTRAINTS;
The ITEM table has a primary key that is referenced by a foreign key in the ORDERS table RECYCLEBIN IS enabled.