Oracle

When the database name and physical structure are the same as the existing databases, the original information will be overwritten;To create a database preparation:1. Plan database tables and indexes to evaluate footprint2. Plan the database will

Triggers are stored as separate objects in the database, unlike stored procedures and functions, where the stored procedure and function require the user to display the call to execute, and the trigger is run by an event to start. That is, a trigger

The dba_free_space shows a tablespace with free space, and if a tablespace is not contiguous, then there is a record in dba_free_space for each space. If a tablespace has several records indicating that the tablespace is fragmented, the tablespace

1. When manipulating DML (create,insert,update) statements, Oracle automatically adds row-level locks when the select * from table for update "of column" "Nowait|wait 3" Oracle also locks automaticallyRecommendation (1) nowait is generally added to

I. Modification of/ETC/ORATAB#orcl:/u01/app/oracle/product/11gr2:norcl:/u01/app/oracle/product/11gr2:y change "N" to "Y"Second, modify the/u01/app/oracle/product/11gr2/bin directory Dbstart and DbshutRemove a commentOratab=/etc/oratabChange

The bfile type is a lob type, and the bfile type is just a pointer to the previous file on the operating system to provide read-only access to the operating system files. Maintenance outside the database, not part of the database.When using BFILE,

1. Using DBV CheckD:\ORADATA\EYGLE>DBV File=eygle. DBF blocksize=8192Dbverify:release 10.1.0.4.0-production on Saturday June 11 17:36:37 2005Copyright (c) 1982, 2004, Oracle. All rights reserved.Dbverify-Start Validation: FILE = Eygle. DbfPage 219

1. First build the test table and insert the test data: Create table mypartition (ID number, code VARCHAR2 (5), identifier VARCHAR2 ( )); Insert into mypartition values(1,' ',' 01-01-0001-000001 '); Insert into mypartition values(2,'up ',' 02-01-0

Oracle Delete user prompt Unable to delete the currently connected user two workarounds are as follows:1, first lock the user, and then query the process number, and finally delete the corresponding process, delete the corresponding userSql>alter

first, what is a view. 1, the view is a kind of virtual table;2, the view is based on the existing table , the view to the establishment of these tables is called the base table ;3. The statement that provides the data content to the view is a

1. Fix the C $ share problem first2. Test the success of C $ share. The method is to play net use \\localhost\c$ in cmd failure will be like this ...: System error 53The network path is not found. Success is like this: the command completed

Previously used Oracle+extjs for project development, may have little contact with the SQL Server database is similar,As far as I am concerned, many projects are generally based on the ado.net+sqlserver2008 R2 (The Used Entity Framework (ORM)

The core is the following two statements, tested Redhat 5 and Redhat 6, the statement of B C D for the SDB SDC SDD, etc., to be modified according to the actual situationRedhat 5For i in B c D E F g h i j k l m n o p; --Make adjustments according to

For the sake of convenience, the following simple models are established and some test data are constructed:In a business admissibility subsystem BSS,SQL Code1 --Customer Information Sheet2 Create TableCustomers3 (4customer_id Number(8) not

Here spit groove, Plsql incredibly wood has 64, before incredibly don't know, long time useless Oracle, want to practice, the method is as follows:1. Install Oracle, the official website has, here does not elaborate, I choose is 64 Oracle installs.2.

ORA-00911: invalid character Error, I usually use pl SQL and golden32 to query database software. If I use golden32, it is no problem to alias it as Chinese when I use it. Until I want to convert PL SQL (use Chinese package chinese.exe ), after the

Temporary Summary of Oracle databases-1 I haven't published a blog for a long time. I have learned mysql before learning oracle. I thought it would be much easier to learn oracle. However, I was wrong, oracle is more difficult than mysql, mainly in

Use of % TYPE and % ROWTYPE in ORACLE, % type % rowtype % TYPE is used in the declaration of variables to obtain the field TYPE in the table;% ROWTYPE is used to declare the row type based on a table; Example:% ROWTYPEDECLARECURSOR pdct_curIs select

The time in oracle is converted to the string to_char (), the string conversion time to_date (), and the use of substr and instr ., To_charto_date   A statement written at work Select * from Bt_Holiday whereTo_char (Setting_DATE, 'yyyy') = Substr ('2

Restrictions on ORACLE databases and ORACLE databases How many tablespaces can an ORACLE database have at most )? How many Database files can a Database have and how many data files can a Database have? When encountering these problems, you can only