Database Administrator

--- 1. Preparations for installing OracleContent of the oracle user. bash_profile FileUmask 022PATH =/bin:/usr/local/bin:/usr/X11R6/binLD_LIBRARY_PATH =/usr/lib:/usr/X11R6/libORACLE_BASE =/u01/appORACLE_HOME = $

In fact, if you want to have a deep understanding of the architecture, You need to cooperate with subsequent backup and recovery experiments and principles. But no matter what it is, first take a look.The control file is a fairly small binary file,

Learning Objectives 1. Describe the logical structure of the Oracle database2. Create a tablespace3. Change the tablespace size4. Allocate space for temporary segments5. Change the tablespace status6. Change the storage settings of the

After installing the Oracle database, we are going to use the PLSQL Developer Software to connect to the server database! The following describes how to set the software and connect to the oracle database: 1. Download and install PLSQL Developer

Db2 has two tables, master table a B is from the table, and the foreign key of B is the primary key of.Both tables of table A and table B have more than one million data records,When A record in Table A is deleted and the primary key is used as the

In my application, I need to generate a random password for this account when the user registers for the first time. The generated password must meet certain requirements. These requirements must be configured by the system administrator. We provide

I recently learned the source code of Mysql and used CMake as the Build tool. By using CMake to scan system configurations, the config. h file is generated. This header file contains a series of macros prefixed with HAVE. Config. h. cmake in the

Oracle entry commandBasic commands:1. the spool command is used to screen recording in sqlplus.Spool c: \ 1.txt automatically creates 1.txt, screen recordingSpool c: \ 1.txt appendAdd to 1.txt2. conn system/orcl switch user connection3. -- meaning

/**** 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.

This error was reported when two linux Red Hat 4 hosts were used to build RAC (10 Gb). The problem was solved later. I just set up RAC, can open Node 1, open Node 2, this error is reported, view the log of Node 1 as follows: SQL>Select * from v $

Today, we will describe how to enable IO settings in Oracle. First, check whether the package of asynchronous io has been installed on the operating system. If not, install it through rpm and check the parameter settings of asynchronous io on the

The Oracle password contains special characters, such as "@". It is written in imp and exp. Today in Oracle data export, because the user name password is a special character, so encountered the error code: "EXP-00056: encountered ORACLE error 12154

I. Overview:A database can be considered as a name set of an SQL object (database object). Generally, each database object (table, function, etc.) belongs to only one database. However, for some system tables, such as pg_database, it belongs to the

Key Generator primary Key Generator the element is used to set the identifier generator. Hibernate provides the identifier Generator interface org. hibernate. id. IdentifierGenerator, and provides multiple built-in implementations. For example, org.

The following experiments are only performed in MYSQL 5.0.45. Method 1: Use the mysql command to lock the table. Public VoidTest (){ String SQL ="Lock tables aa1 write"; // Or String SQL = "lock tables aa1 read "; // If you want to lock

Code 16014 After checking, the system finds that the disk space is full. Therefore, the redundant disk space is deleted and the problem is temporarily solved. The problem will occur again after half an hour. After analysis, the size of the recovery

Cause: The data file in noarchivelog mode is corrupted. Solution: Method 1 (non-RMAN backup ): Because there are no archived log files, the restoration operation cannot be performed in noarchivelog mode and can only be completed. Because no log

Content HR Mode Oracle sample Schema Install HR Mode Demo level Query Hierarchical Query Reference HR mode Oracle sample Schema Oracle has several examplesSchema, Including,HR (Human Resources),OE (Order Entry),OC (Online Catalog),PM (Product

1. Find the mwa. cfg configuration file. In 11i: $ MWA_TOP/secure/ In R12: $ INST_TOP/admin/install/ 2. Set mwa. cfg Trace level: mwa. LogLevel = TRACE 'Mwa. logdir' is the log output path. In R12, mobile logs are written to $ INST_TOP/logs.

1. First install the mysql database (install the database by default) Yum install mysql * Ii. Modify the mysql configuration file The configuration file installed by default in mysql of CentOS series is in/etc/my. cnf Modify my. cnf as follows: vi