Oracle

In Oracle databases, consistent gets is useful for judging the performance of a section of SQL, and generally comparing the performance of two segments of SQL is not to see whose execution time is short, but to see whose consistent gets small. But

Starting with Oracle 10g, Oracle provides a new feature for automatic SGA management (ASMM, or automatic Shared Memory Management). The so-called asmm, means that we no longer need to manually set the shared pool, buffer pool and other memory pool

An external table implementation process based on Oracle_datapump: First, create external tables and generate DMP files 1, create directory, you need to have create any directory permissions: CREATE DIRECTORY admin as '/oracle/admin '; 2, create

Introduction: Oracle In addition to the graphical way in the Oracle editor to import the export of arts and Sciences file data, you can also import the export database in a command-line manner, and its syntax is as follows:IMP

1>. Number type fine-talk:Oracle number datatype syntax: number[(precision [, scale])]Abbreviation: Precision--> PScale--> S Number (P, s)Range: 1 Save data range: -1.0e-130 Stored within the machine range: 1 ~ bytes Valid: The number of digits

Because of the usual database backup and restore operations, To improve efficiency and save time, you have the following batch process. This is written for Oracle, can be used on different computers, because it will automatically read the current

Asp.net|oracle Sometimes a picture or file must be stored in a database because of a need, such as security. Of course, in general, especially when the file is relatively large many people do not advocate the file in the form of binary stored in the

The oracle|server|sqlserver| server takes SQL Server 2000 as an example to illustrate the specific implementation of SQL Server to an Oracle connection server. 1. require PC to install Oralce client software and sqlserver2000 software. 2. Client

Difference | data | database |oracle|sqlserver For years, there has been a protracted acrimony between Microsoft's supporters and Oracle's supporters. This is where Oracle databases have such capabilities, and there are those features of SQL Server

oracle| Design | data | Repeat we may have this situation, a table originally poorly designed, resulting in the table data data duplication, then, how to delete the duplicate data? Duplicate data may have two scenarios, the first one being only

Oracle Oracle Data Pump Step 2004/08/27 These two days in the test ora10g data pump, will carry out the steps to post it for everyone to see Because my test database data is not much, the speed of data pump is not obvious, but the backup file size

Oracle First part, Sql&pl/sql [Q] How to query special characters, such as wildcard% and _ [A]select * from table where name like ' a\_% ' escape ' \ ' [Q] How to insert single quotes into a database table [A] can be handled with ASCII code, other

oracle| Experience Oracle's system is too large, for beginners, it is inevitable that some will not be able to feel, what all want to learn, the results of what are not good, so the learning experience to share, I hope that the people just getting

Oracle has previously installed Oracle on this machine, and generally does not appear to be unable to start the problem. But this time is not the same, installed 8.17 after a period of time can not be activated, the symptoms are as follows: In

Oracle Because of the project, you need to use the bfile field to store image files, so some research has been done. bfile Field The actual file is stored in the file system, and the file location pointer is stored in the field. bfile to Oracle

oracle| process Many beginners install Oracle, do not know how to configure Enterprise Manager, can not go in, because this kind of problem see much, now I write down the detailed process: 1: Start-> Program->oracle->configuration and Migration

oracle| Create Available for: Table spaces, rollback segments, tables, indexes, partitions, snapshots, snapshot logs Parameter name default value minimum Maximum description INITIAL5 (block) 2 (data block) operating system limits the size of the

oracle| optimization The purpose of this article: 1. Say something about Oracle's optimizer and its related knowledge. 2, answer why sometimes a table of a field is clearly indexed, when the observation of some SQL execution plan, found that the

oracle| Performance | optimization 46. Connect multiple Scans If you compare a column to a limited set of values, the optimizer may perform multiple scans and concatenate the results. Example: SELECT * From lodging WHERE MANAGER in (' Bill

The ADF (Application development Framework) is a solution to the JEE platform for Oracle Master push, including JDeveloper (development IDE), Weblogic (Server container), ADF Faces (JSF implementation), ADF richFaces (extension components in JSF),