Oracle

The following error occurs when exp is input in the DOS environment. . Exporting objects and operations in the pre-schema Process. Exporting User fjzyinfo's external function library name. Export public type Synonyms. Export private type Synonyms.

Bitmap indexes are suitable for low-cardinality columns. Low-base columns only have a few values. Bitmap index problems:Bitmap indexes are used. A key points to multiple rows, and hundreds or more rows may exist. If you update a bitmap index keyThe

  Table data; Menu_id Is_tree 0001 1 0002 1 0101 2 0102   0103   0201 5 0202 6       -------------

First look at the table content Select name, pass from T1; 2. Method 1: Use the decode Function Select name, decode (Pass, 'passs111', 'pass1', 'pass222', 'pass1', '', 'Password') from T1; Note: If you do not list the possible

Parsing command line arguments:Parameter "silent" = true Java. Lang. arrayindexoutofboundsexception: 2At oracle.net. Ca. cmdlineargs. parseargs (unknown source)At oracle.net. Ca. initialsetup. (unknown source)At oracle.net. Ca. netca. Main

Oracle tablespace operations Author: http://avill.cnblogs.com/archive/2006/04/16/376261.html Source: updated on: Create a tablespace Create tablespace data01Datafile '/Oracle/oradata/DB/data01.dbf' size 500 mUniform size 128 K; # specify the area

I'm in http://zhidao.baidu.com/question/123262452.html? I am very grateful to zw.ssg for sorting out the questions raised by Fr = MSG.Answer   Sorting memory involves PGA.When can I use automatic PGA memory management? When can I use manual PGA

Oracle backup features include: Advanced Replication) Streaming Replication) Slave uard) One worker uard: Dataguard is generally the first choice for DBA in terms of high availability and Disaster Tolerance. After all, dataguard has an overwhelming

In Oracle, the left and right join statements in SQL Server are saved, and they are represented by a "(+.In the following experiment, query 1 and query 2 are equivalent, and query 3 and query 4 are equivalent. Query 1:Select first_name,

I. Why partition? Oracle big tables have the following manageability and performance constraints: 1. Table availability A. The damage to the large table read disk is more fragile. B. It usually takes several hours or even longer to restore a

Star conversion is a very powerful optimization technology. It is implemented by implicit rewriting of the original SQL statement, which can greatly reduce I/O. end users do not need to know any details about star conversion. The database optimizer

I. test environment:Vmoel5u4: IP: 192.168.92.100OS: Linux version 2.6.18-164. EL5DB: Oracle 10g Enterprise Edition Release 10.2.0.1.0; Even machine: IP: 192.168.92.200OS: Linux version 2.6.18-164. EL5DB: Oracle 10g Enterprise Edition Release 10.2.0.1

Method 1: You must use the PL/SQL Dev tool.1. Open PL/SQL Dev and select the table to be exported. Right-click the table and select export data from the pop-up menu, as shown in ). 2. After you click Export data, the export settings window appears

Create two BAT files, create_all.bat and create_all_file.bat. The details are as follows: Create_all.batEcho offSet the following content for REM.Rem set driver = D:Rem set filepath = D:/mywork/SQL/Set user_id = AndySet user_pwd = AndySet servername

-- Obtain the number of seconds of the difference between the two time periods(Q. nh j ca0select Ceil (to_date ('2017-05-02 00:00:00 ', 'yyyy-mm-dd hh24-mi-ss')-to_date ('2017-04-30 23:59:59 ', 'yyyy-mm-dd hh24-mi-ss ') * 24*60*60*1000) differs from

JDBC direct connection   string result =" "; // query result string string SQL =" select sysdate from dual "; // SQL string // connection string. Format: "JDBC: Database driver name: Connection Mode: @ Database Server IP: Port Number:

Oracle databases are generally accessed remotely. Local access is probably used for testing. The following describes a simple access method: Oracle9i. Run: Net configuration assist. The procedure is as follows:Add Oracle8i or later database or

To implement the Restore point function of the Oracle database, the Oracle database must run in archivelog mode and be enabledFlashback logging.   Procedure: 1. Shut down the Database Service: shutdown immediate; 2. Start the Database Service

  This cannot be avoided during sorting in queries. Generally, we add sorting fields when writing SQL statements. If the sorting field is a string, it is a little troublesome. For example, a numeric field should have been designed to be integer

Sometimes the database cannot be imported smoothly, and a bunch of errors are reported.Probably because the user does not exist, or the user's tablespace does not.Check the error message and you will know.The following is an example of creating a