Test: Root Installation # yum Install jdk-8u51-linux-x64.rpm # yum Install sqldeveloper-4.1.1.19.59-1.noarch.rpm #/usr/local/bin/sqldeveloper Enter the path to the JDK/usr/java/jdk1.8.0_51/ Click the upper left corner + sign to create a new connection: Sys/password, Connection type: Basic, Role: SYSDBA 192.168.0.1 Port 1521 Sid:orcl Test, save. Garbled and changed to Chinese
To add a startup script:
# Vi/etc/oratab Change N to Y Orcl:/u01/app/
: grant execute on dbms_rls to user1;
Policy_name can be customized.
ENABLE_POLICY () is used to enable or disable a vpd policy, but only one vpd policy on a table can be enabled or disabled at a time, to enable/disable the vpd policy for all tables at one time, you can follow the preceding procedure .) And set context: Then we query the vpdsample_clothing table, and only the clothing information with ID 10002 is returned. Similar to vpdsample_books, only the book information with ID 10005 is re
PL/SQL introduces the corresponding elements of procedural languages, such as conditional branches or loops. However, SQL itself is still nested as the subject, because the SQL engine is required to execute SQL commands, for PL/SQL programs, there are often many PL/SQL engine-SQL engine interactions, too many such interactions will have a negative impact on performance.
Oracle introduces bulk SQL in PL/SQL to minimize the interaction between PL/SQL-SQ
VPD: Oracle Virtual Private Database, that is, [Oracle Virtual Private Database]. By applying some policies, you can only access the data that is allowed to be accessed. The principle is relatively simple. Oracle automatically adds a Where clause for the statement submitted by the corresponding user according to the policy to control the data that the user can ac
Oracle Streams Advanced Queuing (AQ) is a robust and feature-rich message queuing system integrated with Oracle Database. when an organization has different systems that must communicate with each other, a messaging environment can provide a standard, reliable way to transport critical information between these systems. AQ is implemented in database tables.
Oracle
, lang from t2;1 chinese
1 english
2 chinese
2 1 english
After connect:
Select emp, mgr, lang from t2Start with emp = 1Connect by prior emp = mgr;1 chinese
2 chinese
2 1 english
1 english
2 chinese
2 1 english
Lang = 'China' after filtering:
1 chinese
2 chinese
2 chinese
Repeated rows are obviously not the expected results.
7) CONNECT BY LEVEL
Next, let's take a look at a special usage of connect by level. This is a headache, but it is also very useful in some situations:
Select LEVEL from
1) classification of Sets
Oracle supports three types of collections:
Associative array (Index-by table)
Nested table)
Variable-length array (VARRAY)
One of their differences is that the Nested table and VARRY can be used either in PL/SQL or directly in the database, but the Associative array doesn't work, that is, associative array cannot be created separately using the create type statement. It can only be defined and used in PL/SQL blocks (or packa
to define how the extents are managed when you create a temporary table space. Modifying a temporary table space Modifying a temporary tablespace mainly has the following actions:
Add temporary files
To modify the size of a temporary file
Modify the status of a temporary file
Add temporary files Alter tablespace temp0304
Add ' F:\SQL\tempfile0306.dbf ' size 10m; Modify temporary file size Alter Database tempfile
' F:\SQL\tempfile0306.dbf ' resize 20m; You can also mo
Tags: 1.5 project editing compilation installation install Cal English Learning nbsp Quick ReadingEveryone knows it is important to learn the Linux system, to find the Man Handbook Help, but the default Linux man manual is an English document, it is important to quickly read the English men, but the configuration of Chinese men can also allow themselves to learn faster! Of course, we can not stop learning English!1. Go to the official website to downl
1) Prepare test data
If you have less time to talk, go straight to the subject. Create a simple employee table t_hierarchical:
Emp employee ID
Direct superior of Mgr employees (Mgr itself is also an employee)
Emp_name employee name
Insert
1.2 installationElasticsearch requires at least Java 7. We recommend that you use the JDK version 1.8.0_25 of Oracle. When you install Elasticsearch , please check the Java runtime version first. Java-version Echo $JAVA _homeonce we have installed Java, we can download and run Elasticsearch. Binary files can be downloaded from www.elastic.co/downloads and https://github.com/elastic/elasticsearch/releases . For each version, you can choose zip/tar 包 ,
This is a hands-on manual that anyone can use to learn the front end, outlining and discussing the practice of front-end engineering: What to learn and what to do in practice.There are two purposes for writing the handbook: one is to provide professional resources for potential and ongoing front-end developers, including learning materials and development tools; The second is that the handbook can be used b
Friends familiar with Citrix XenDesktop and XenApp products know that Citrix officials will write a virtual Handbook Handbook based on the latest product versions, with comprehensive and detailed descriptions of product architecture, design logic, resource allocation, network performance, and more.However, with Citrix starting from 2016 to provide LTSR and CR two models, Virutal
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The use of Man Handbook in Linux--taking CentOS6.8 as an exampleThis article is intended to show you how to quickly start a new command in Linux, after all, in a Linux system, you can do everything by command.Related commands: Help mans Whatis Info#whatisA friend with a certain understanding of English, should be very familiar with the word is two words, like "what", so for a less familiar command, you can first use this command to view, such as input
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Content IntroductionDeveloping robust software requires efficient algorithms, and programmers often go to the algorithm until the problem occurs. The Algorithmic Technology manual explains many of the existing algorithms that can be used to solve a variety of problems. By reading it, you can learn how to choose and implement the right algorithm to achieve your goals. In addition, the book's mathematical depth is moderate enough to allow you to understand and analyze the performance of the algori
Label:******************************************************************************** MLA Handbook for Writers of the papers.7th ed. New York:mla,2009.print.And a copy, left to read.MLA Style Manual and guide to scholarly publishing.3rd ed. New York:mla, 2008.print.********************************************************************************1. Summarydistinguish article content:, your ideas/words;described, your summaries and paraphrases of others
Tags: official opening important Interface Step Index comparison introduction + +In the actual application, SQLite, as the most popular open-source embedded relational database, is playing an increasingly important role in the architecture design of the system. Unlike many other embedded NoSQL databases, SQLite supports many of the basic features of relational databases, which have an irreplaceable advantage in data migration, program presentation, and other applications. From the official docum
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