Database Administrator

1. Ensure that the source database is in the archive mode and the logging mode is mandatory.Shutdown immediate;Startup mount;Alter database archivelog;Alter database force logging;Alter database open;2. Make sure that you have created a password

Leading hint indicates that Oracle uses the table specified in leading as the driving table,For example, the normal access plan is as follows:SCOTT@www.bkjia.com> select e. ename, hiredate, B. comm2 from emp e, bonus B3 where e. ename = B.

Mysql has a large number of character sets, from the client to the result set, from the server to the database to the table to the column, you can set character sets, flexible and powerful, but it is very prone to problems, if you do not understand

Due to objective reasons of disk space, it is not possible to use rman and expdp to generate landing files for recovery or import operations. Therefore, impdp is used to import data using network_link, this method is really good, and because impdp

The latest mysql versions require cmake compilation and installation. It is estimated that this method will be used in future versions. Therefore, we will record the installation steps and procedures for your reference. Note: This installation is

After a week of hard work, I finally completed the Fedora 16 X86_64 system on the new machine. Compared with the Fedora 14 in this book, the current Fedora version feels more beautiful and stable, but it is not a habit to use it. For more

(1) Requirements for installing mysql5.5 The compilation and installation of mysql5.5 is a little different from that of 5.1, because mysql uses cmake as the compilation Engineering tool. This is the biggest difference from mysql5.1, so the Toolkit

To query the total number of fields in a table in Oracle, use an SQL statement or Select count (column_name) from user_tab_columns whereTable_name='T_ B _AUDITOR' The number of fields in the specified table can be found. The following is a rough

I. Index type:PostgreSQL provides a variety of index types: B-Tree, Hash, GiST, and GIN. Because they use different algorithms, each index type has a suitable Query type, saving time and resources, the create index Command creates a B-Tree INDEX.1.

After installing Oracle, you must add the following settings in linux to use oracle normally: Set two environment variables: ORACLE_HOME and ORACLE_SID, and add the bin directory of ORACLE to PATH. Generally, ORACLE_SID = orcl is installed by

Version: hibernate-3.2.7 One method: Use uuid to generate a unique primary key. In this way, if the Object id is null, a UUID is automatically generated during storage. If the id is not null, this record is located in the database and then updated.

Since MySQL 5.5 released its first version, a new record is added to the GRANT permission list: PROXY. Do not think this is the previous MySQL Proxy. In fact, this is used as a vest for users. Let's take a look at the specific usage.Here, I use

CouchDB is very easy to implement distributed data replication. We only need to send the POST request to the specified database_ ReplicateThe request Body is a JSON string. Wiki.apache.org/couchdb/Replication To continue copying, you only need to

Download mysql-5.1.60-linux-x86_64-glibc23.tar.gz to/home/a/soft/ Shell> sudo groupadd mysqlShell> sudo useradd-r-g mysqlShell> cd/home/a/soft/Shell> tar zxvf mysql-5.1.60-linux-x86_64-glibc23.tar.gzShell> cd/usr/local/Shell> sudo

Here we use a project integrating mongodb in spring-data. First, add the dependency on it in maven. Here we use version 1.0.0.M5. Dependency> GroupId>Org. springframework. dataGroupId> ArtifactId>Spring-data-mongodbArtifactId> Version>1.0.0.M5

ROWID determines Based on the index:SQL> select rowid from; ROWID ------------------ AAAQ/LAACAAABacAAA AAAQ/LAACAAABacAAB SQL> desc; Name Null? Type ----------------------------------------------------------------------------- Id not null number (5)

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

Introduction: When processing a sequential account with similar records, you may often encounter the situation of "taking the first and last records for calculation on a certain Table value. For example, the logging and end-to-end increase.

When modifying the Oracle data field type, you can change the data in the table as follows: Alter table name rename column field name TO field name 1; Alter table name ADD field name VARCHAR2 (30 ); UPDATE table name SET field name = CAST (field

Oracle asmlib is a system package provided by Oracle on the linux platform to replace raw devices. It is easy to install and configure. You can refer to my article. This article describes a small problem that occurs during the use of replicel asmlib.