Database Administrator

1. the fastest possible implementation speed of Oracle Database paging is 1> 2> 3 First, layer-4 rowid is used.The second method is to use rownum to paging three layers (oracle stipulates that rownum can be used only once in each query)The third

A horizontal table is a common table creation method. For example, a table has the following structure:Primary Key, Field 1, Field 2, Field 3...If it becomes a vertical table, the table structure is:Primary Key, field code, and field value.The field

There have been several online databases recently, and the hard disk is relatively tight, but it is not convenient to resize and transfer to other machines. However, data is important and needs to be backed up frequently. The earliest practice was

I. Install the operating system and patch packOnly GNOME Desktop is installed when the operating system is installedYum install gcc-c ++ libXp libaio make binutils openmotif setarch compat-db compat-gcc-c ++ compat-libstdc ++-devel rsh

Principle and topology of MySQL master-slave replication: 650) this. width = 650; "border = 0> Preparations:1) configure the Host Name and IP addressNode1.forman.com 172.16.220.11Node2.forman.com 172.16.220.122) time synchronization and dual-host

Oracle software version: 10.2.0.5 Oracle Installation Directory:/u01 Copy the entire Oracle directory from the source server to the target server in lync mode. It is reasonable to say that software migration will not cause serious errors. However,

Let's talk about rba, rba = redo byte address. When it comes to rba, we need to know a few points in advance, that is, controlfile header, ckpt process, dbwn process, and dirty buffer. Let's take a look at the composition of RBA: It consists of

When writing the stored procedure, the system time format conversion is used to compare with the database field, when I test throw the ORA-00907: missing right parenthesis, the default right brace; The following is my error code: Dynamic_ SQL: =

Today, the undo tablespace of a database on the development side does not know who has set it to auto scaling. What is called House leakage is that the development staff ran a huge task today, then the direct consequence is that the undo tablespace

MySQLDumper is a PHP management script for backing up and recovering MySQL databases. It is easy to use. It is mainly used to manage MySQL databases for users who cannot directly operate the server, such as free space and shared hosts. Even if you

/Etc/my. cnf Configuration [Mysqld]Datadir =/var/lib/mysqlSocket =/var/lib/mysql. sockUser = mysql# Default to using old password format for compatibility with mysql 3.x# Clients (those using the mysqlclient10 compatibility package ).Old_passwords =

There are many online posts and comments about the failure of MySQL Service Startup (1067). It is difficult to tell the true or false, or whether it is the same as your own errors. With the lessons learned, it is necessary to declare in advance

Steps to solve Oracle undo tablespace explosion: 1. Start SQLPLUS and log on to the database with sys.# Su-oracle$> Sqlplus/as sysdba 2. Find the UNDO tablespace name of the database and determine the UNDO tablespace used by the current routine:Show

Now all business systems are deployed with various types of monitoring for various aspects, so Oracle is no exception. We also need to monitor oracle, such as the instance survival status, the survival status of the listener and the running status

If the prompt says no... /oracle/11g/Solaris/j2ee/oc4j_applications/applications/em. ear file. After downloading the Oracle 11g, decompress the package and there are two folders. This error occurs because the file copy is incomplete, you only need

UNDOThe tablespace is restored when there is hot standby and no transaction occurs. First, let's take a look at ensuringUndoNo transactions in the tablespace SQL> select XID USN, XIDSLOT, XIDSQN fromv $ transaction; No rows selected Second, confirm

Application background:In some cases, because the preliminary design is not fully considered, the tablespace pre-creation is too large, far exceeding the actual size. As a result, the need to shrink the space occupied by the tablespace

Dbca or manual script can be used to create a database in Oracle. Version: oracle10.2.1. The method for creating a database by manual script is summarized as follows: Note: you must first create a directory and change it to your own directory; Step 1

1) constraints: constraints Imposed on tables to ensure data integrity and prevent data loss in associated tables;Common constraints:-NOT NULL-UNIQUE-PRIMARY KEY-FOREIGE KEY-CHECK When creating a table, specify the constraints. You can also add or

Database ErrorGATHER_STATS_JOB encountered errors. Check the trace file.Errors in file/opt/Oracle/diag/rdbms/dbserver1/dbserver1/trace/dbserver1_j003_10544.trc:ORA-20011: Approximate Newcastle failed: ORA-01476: divisor is equal to