Oracle

1> Database Server Character SetSELECT * from Nls_database_parameters, which is derived from props$, is the character set representing the database.The query results are as followsNls_language

1, Oracle is a large database and MySQL is a small and medium-sized database, Oracle market share of up to 40%,mysql only about 20%, while MySQL is open source and Oracle price is very high2, Oracle Support large concurrency, large traffic, is the

Temporal table ConceptsA temporary table is a database object that is used to temporarily save temporary data (or intermediate data), which is somewhat similar to a normal table, but is quite different. It can only be stored in a temporary table

DDL statements cannot be used directly in Oracle's stored procedures, such as CREATE, alter, DROP, truncate, and so on.That assumes that we want to create a temporary table in a stored procedure that can only use dynamic SQL statements:Create or

CREATE OR REPLACE PROCEDURE proc_tt_trms_car_task (p_batch_num in number DEFAULT 5000,--processing data volume P_commit_num In number default 500-batch commit data volume) as V_count INT default 0; --Batch commit count V_mid_count INT DEFAULT 0; --

I. OverviewUndo saves the old data. Example. You changed a record to change the A-column ABC to def. Then undo keeps ABC. There are two purposes: 1. Assume that your transaction is not committed. But already the column a changes, then others read

Test user of Oracle database Scott's password why is Tiger?In June 1977, Larry Ellison and Bob Miner and Ed Oates co-founded a computer company called the Software Development Lab (software development laboratories,sdl) in Silicon Valley (Oracle

Let's talk about the table structure first name score Fenshu table name test1, the following query is ranked third and fourth place, this template lets you check the random rank of the personSelect NAME,FENSHU,MC from (SelectNameFenshu,Dense_rank ()

-Three Forms of loop (1). LOOP (2). While ... Looop (3). For ... LOOP1. Basic Loop statement set Serveroutput on;--exit ... when end loop declare v_value number (8): =-3; BEGIN >-loop tag loop dbms_output.put_line (' V_value = ' | | v_value);

DML languages, such as Update,delete,insert, are required to modify the data in the table Commit;ddl language, such as Create,drop, to change the table structure, do not need to write a commit (because the internal hidden commit);DD l Data

in this article, the root block, branch block, leaf block, the table block are index root block, Index branch block, index leaf block, data table block abbreviation. In addition, most of the ideas in this article come from the Master geomechanics

I. Database DMP file ExportUnder the PL/SQL tool, select Export Tales, select all tables, and select the exported path.Second, database DMP file ImportCreate user table space;Create User: Grant DBA to AML;Execute Import Script: (premise: Windows

Premise: The local Oracle database is working properly.Database: Oracle 11gVirtual machine: vmware_workstation_full_12.5.2Native System: Windows 7 Ultimate EditionVirtual machine system: OpenSUSE LINUXNetwork adapter The IP address of the VMware

"Others laugh at me too crazy, I laugh at how others see it?" The motto of a jiangzi that was delayed by the database was a humorous one. Before introducing the fat job, you know who he is, and you may not believe that Fat Man is a program ape, and

The differences between MySQL and Oracle are summarized as follows:1. Oracle is a large database and MySQL is a small and medium-sized database, Oracle has a market share of only about 20% 40%,mysql, while MySQL is open source and Oracle is very

I. what is the Oracle character setThe Oracle character set is a collection of symbols that interpret a byte of data, have a size, and have a mutual containment relationship. ORACLE's support for national language architectures allows you to store,

centos6.5 64-bit basic server installation ORACLE11G_R2 64-bitLiu Mei-begDate: 2017.06.051. Install dependent packages# yum-y Install gcc gcc-c++ make binutilscompat-libstdc++-33 elfutils-libelf elfutils-libelf-devel glibc Glibc-commongli Bc-devel

Recently in the Oracle data migration, from one server to another server up, encountered a variety of problems, such as the introduction of DMP files, encountered IMP-0009 error, tossing for a half day, found that I was connected to the server

First step: Enter Clientshell[Email protected]:~$sqoop.sh ClientSqoop Home directory:/home/fulong/sqoop/sqoop-1.99.3-bin-hadoop200sqoop shell:type ' help ' or ' \h ' for help.Sqoop:000>Set server--host FBI003--port 12000--webapp sqoopServer is set

Oracle data query using C # for SQL or ASP. When the query condition exists in Chinese , because the data server and client/natively have different character sets , the data table has data, but the data is not queried. However, data queries can be