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1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install it under the program Files (x86) directory or you cannot start PL/SQL Developer.Wonder wh
1. Log in to PL/SQL DeveloperThis omits the installation steps for the Oracle database and PL/SQL Developer, and note that when you install the PL/SQL Developer software, do not install it under the program Files (x86) directory or you cannot start PL/SQL Developer.Wonder wh
Assume that you have a network ordering system based on Microsoft. NET, but the QC maintenance system still uses an old Oracle database application. If your customer places an order such as product replacement during the warranty period, the order will not be charged. In this case, you need to obtain real-time query results from the Oracle database. By establishing a link server (linked Server), you can que
Access the Oracle server through SQL J of DB2 Today I saw a book about Oracle SQLJ, so I want to give it a try. However, I only installed the Oracle thin client on Ubuntu 14.04. There is no SQLJ, so the sqlj thought of using the IBM-db2, it was successful. 1. Run runtime12ee
Transaction processing is a key issue for all large database products. database vendors have spent a lot of energy in this aspect, different transaction processing methods may cause huge differences in database performance and functions. Transaction processing is also a problem that must be deeply understood by database administrators and database application developers. Negligence on this issue may lead to application logic errors and inefficiency. Next we will discuss some of their differences
Label:Test environment Introduction 1, Oracleserver Database version:10.2.0 ip:192.168.1.5 Oracle_home:d:\oracle\product\10.2.0\db_1 2. Oracle Transparent Gateway Server version:10.2.0 ip:192.168.1.15 installation directory D:\oracle\product\10.2.0\tg_1 3. MS SQL Server SQL
In the program, Oracle databases and SQL databases are often supported. Some Oracle built-in functions are mostly used, but the syntax in SQL is somewhat different. I have done some sorting and hope to help you .... 1. built-in functions in oracle: round functions in
) Identify the SQL statement for ' inefficient execution ':While there are a variety of graphical tools for sqlseo/' target= ' _blank ' > optimization, writing your own SQL tools to solve problems is always the best approach:SELECT executions, disk_reads, Buffer_gets,ROUND ((buffer_gets-disk_reads)/buffer_gets,2) Hit_radio,ROUND (disk_reads/executions,2) Reads_per_run,Sql_textFrom V$sqlareaWHERE executions>
Functions in oracle are divided into character functions, number functions, date functions, empty processing functions, conversion functions, and other common functions. The following are some SQL functions commonly used in ORACLE: lower () function content conversion LOWER case SQLSELECTLOWER (T_NAME) FROMtest_partitioning2; lower (T_NAME )------------ Functions
1. Introduction This article focuses on the benefits of using SQL Server Integration Services to extract data from heterogeneous data sources and to import data into Microsoft®sql server™ for Business Intelligence (BI) analysis and reporting. Oracle database 10g data is used as the primary data source. Readers of this article include IT professionals, database
How to use dynamic SQL in oracle development in general PL/SQL programming, SQL can be directly used in DML and transaction control statements, however, DDL statements and system control statements cannot be directly used in PL/SQL. To use DDL statements and system control s
A well-designed, performance-capable database engine can easily serve thousands of users at the same time. And the "weak" database system with more users to access the system will greatly reduce its performance. In the worst case, it could even cause the system to crash. Of course, parallel access is the most important problem in any database solution, and various kinds of database systems are proposed in order to solve the problem of parallel access. SQL
Database concurrent access, where two or more users access the same data at the same time, is the biggest problem for the database engine to design and implement a moderate response. A well-designed, performance-capable database engine can easily serve thousands of users at the same time. And the "weak" database system with more users to access the system will greatly reduce its performance. In the worst case, it could even cause the system to crash. Of course, parallel access is the most impor
Two test samples were made in the art of simulating Oracle performance diagnostics. The book says not to bear relies_on. Cache (Result_cache relies_on (test1,test2)). The test proved incorrect, and the function F1 () did not use relies_on, but the changes on the table affected the function. C:\Documents and Settings\guogang>sqlplus Gg_test/[email Protected]_ggSql*plus:release 10.2.0.1.0-production on Monday
access|js|oracle|server|sqlserver| Access | data | Database access Oracle, SQL Server, DB2, Informix, Access database in JSP Now have a lot of novice JSP users will often ask the database how to connect ah, how old mistakes ah? So I concentrated in this write an article for your reference, in fact, this database logic all put in the JSP may not be a good practice
1. select an appropriate ORACLE optimizer 2. Access Table 3. Share SQL statements 4. Select the most efficient table name sequence (only valid in the rule-based Optimizer) 5. The connection sequence in the WHERE clause. 6. Avoid '*' in the SELECT clause '*' 7. Reduce the number of database accesses 1. select an appropriate ORACLE optimizerThere are three optim
/9D/FB/wKioL1mJgPzyH_ Araabn5wfyjxi467.jpg-wh_500x0-wm_3-wmp_4-s_216741007.jpg "alt=" Wkiol1mjgpzyh_araabn5wfyjxi467.jpg-wh_50 "/>Related view important fieldsV$sqlareaV$sqlareav$sql and V$sqlarea are basically similar, and v$sqlarea is more commonly used, so only the V$sqlarea characters commonly used section of the description, as follows (personal reference to Oracle Official document translation, due to
for SQL optimization are emerging, writing your own SQL tools is always the best way to solve the problem:Select executions, disk_reads, buffer_gets,Round (BUFFER_GETS-DISK_READS)/buffer_gets, 2) hit_radio,Round (disk_reads/executions, 2) reads_per_run,SQL _textFrom v $ sqlareaWhere executions> 0And buffer_gets> 0And (BUFFER_GETS-DISK_READS)/buffer_gets Order by
Oracle uses TRACE for SQL Performance Analysis If the SQL _trace parameter is set to true, the entire instance will be tracked, including all processes: User processes and background processes, which may cause serious performance problems and must be used with caution in the production environment. 1. perform trace operations based on related transactions or
Oracle SQL * Loader architecture 1. SQL * Loader architecture SQL * Loader controls the description of the entire load by an input control file, one or more data files are used as raw data, its detailed composition structure includes Input Datafiles --> Loader Control file, the original data File loaded to the database
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