Database Administrator

PostgreSQL cursor example (create a cursor and traverse it in the function) -- Drop function top100cur (refcursor ); Create FunctionTop100cur (refcursor)ReturnsRefcursorAs$ Begin Open$1For Select*FromPersons limit 100; Return$1; End $

/**** Generate air ticket database Test Data @ Author zdw *****/ ALTERProc [dbo]. [init_all] As -- City Data ExecDbo. init_city -- Airport data ExecDbo. init_airport -- Airline ExecDbo. init_airline -- Other basic data ExecDbo.

We can directly modify it through the SQLPLUS client, or in linux, but the commands are the same. Next we will focus on the introduction in linux: Su-Oracle Sqlplus/nolog Connect/as sysdba Alter system set processes = value scope =

For more information about rownum and rowid, see: For details about how to use rownum paging, refer to the following SQL Select*From (  SelectT1.*, RownumRnFrom ( Select*FromScott.EmpOrder BySalDesc --Here is the sorted table  )T1Where Rownum 8

Create test table Create table base_users ( Userid varchar2 (16 ), Username varchar2 (32 ), Passwd varchar2 (16) ) Tablespace cat_data; Insert one by one Create or replace procedure insert_data_one_by_one (n in number) As CurrentId number (16): = 0;

-- I am a beginner in Oracle. I don't know if there is any better way. Create table PASSWD_CHANGED(USER_NAME VARCHAR2 (20 ),OLD_PASSWD VARCHAR2 (100 ),NEW_PASSWD VARCHAR2 (100)) Create or replace function my_password_verify (username

Restore with RMAN 1. Use the restore command Read the data blocks in the backup file, and store the data blocks in the corresponding data files according to the data files to which the data blocks belong, so as to restore the data. 2. Use the

1. Prepare the system environment before installing Oracle 11g R2 database   1. view the system version, kernel version, number of operating system digits, memory and swap partition size, file system space, host name, IP address, and so on. [Root @

DBMS (Data Base Management System) database Management System, as its name implies, is a Data Management System. Data must first be available and then managed through instances, an instance is a memory structure and background process. In short, it

Allow users to organize irrelevant data togetherSyntax: PARTITIONBYLIST (column_name) ( PARTITION part1VALUES(Values_list1 ), PARTITION part2VALUES(Values_list2 ), ... PARTITION partNVALUES(DEFAULT) ); Example: CREATE TABLEEmployee ( Emp_

Statement for inserting database data:Insert into testtab (FIELD1) VALUES ('test ')If the string to be inserted to the database contains single quotation marks, escape is required. For example, to insert "It's a tree.", the SQL statement is as

. System-level preparation 1. Install the following software [Root @ www.bkjia.com ~] # Yum install binutils unzip-libelf glibc libaio libgcc libstdc ++ make compat-libstdc ++ elfutils-libelf-devel-* glibc-headers glibc-devel libgomp gcc-c ++ libaio

After installing Oracle10g, everything works properly. However, when the preferred language of the client browser is Chinese (Chinese/China [zh-cn, the EM button may contain garbled characters (EM will automatically select the Display language based

MongoDB is a scalable and high-performance open-source NoSQL document database. It is mainly developed using C ++. For document storage, full index support, replicable and high availability, automatic sharding, and other features. Among

First, let's look at the table we want to query: SQL>SELECT*FROMEMP; EMPNO ENAME JOB MGR HIREDATE SAL DEPTNO ------------------------------------------------------------ 7369 smith clerk 7902 800.00 20 7499 allen salesman 7698 1600.00 30

-- Log on to Oracle Sqlplus/as sysdba -- Query lock Information Select t2.username, t2.sid, t2.serial # from v $ locked_object t1, v $ session t2 where t1.session _ id = t2.sid and rownum Result: Username sid serial #---------------------------

We use hibernate (hereinafter referred to as h) to manage the association between database tables. The basic principle is actually very simple, that is, to transfer the association between tables in the database to the class of the Entity bean,

If exists (Select*FromDbo. sysobjectsWhereId = object_id (N'[Dbo]. [sp_who_lock]')AndOBJECTPROPERTY (id, N'Isprocedure') = 1) Drop Procedure[Dbo]. [sp_who_lock] GO /*************************************** ************************************ //

This error occurs when you use RMAN to back up database archive logs, "RMAN-8137: WARNING: archived log not deleted as it is still needed ". This is a prompt that the archive file operation failed after the archive log is backed up. The script for

Sys @ TARGETAD> select * from v $ version where rownum BANNER-------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-Production This error occurs when the foreign