Database Administrator

1,If the date to be inserted is the current time, the simplest method is to use the date function sysdate that comes with Oracle.When creating a table, declare the default value of the field as sysdate, as follows:Create table examples(Names varchar

The difference between OracleLob and OracleBFile is that the data of the former is stored on the server rather than in the physical files of the operating system. It can also be a read/write object, which is different from OracleBFile (the latter is

The operating system installed this time isCentOS 1, 5.4Version.OracleDatabase is 11g R1. When installing the operating system, select the installation graphical interface and install it later.OracleDatabase. After the system is installed,

This problem occurs when Oracle is installed on Linux for the first time. Previously, when installing Oracle on Linux, The RedHat series Linux was generally used. During the installation process, a lot of installation work needs to be done, such as

Oracle 11g R2 64-bit start em with the following error:[Root @ localhost ~] # Su-oracle[Oracle @ localhost ~] $ Emctl start dbconsoleEnvironment variable ORACLE_UNQNAME not defined. Please set ORACLE_UNQNAME to database unique name.[Oracle @

1. After you create an OCR and VOTE shared disk in the VM, you can use fdisk-l to partition the disk at one vertex. However, you must check whether the raw data is available. Once or twice, it is sometimes available. Sometimes the Raw prompt

Dual is a virtual table used to form the select syntax rule. Oracle ensures that there will always be only one record in dual. We can use it to do a lot of things, as shown below: 1. view the current user. You can execute the following statement in

The company's recent MySQL always has a large number of lock tables. After analysis, it basically uses the MYISAM Table engine. A large number of reads and writes to a table by MYISAM will cause the entire MySQL table to be locked, as a result,

Requirement: at the end of some activities, you need to query game data at a certain time point in time. Implementation: Two Methods One worker uses mysql.exe + at/to schedule tasks D: \ mysql \ bin \ mysql.exe-u "username"-p "password" dbname --

Due to work needs, the storage process has been being written recently. After three years of work, I have been doing management, and I have never been familiar with the stored procedure. This time, I can practice it well. Here is an important reason

The Table Partitioning function of Oracle brings great benefits to various applications by improving manageability, performance, and availability. In general, partitions can greatly improve the performance of some queries and maintenance operations.

There are usually two ways to use DB2 logs: cyclic logs, that is, do not use the archive log mode. The other is the archive log mode, which is the cyclic log mode by default, that is, logs cannot be archived or backed up online. The following table

Symptom: ORA-01652: unable to extend TEMP segments through 128 (in tablespace temp) Generally, after the Select statement and create index are sorted using the TEMP tablespace, Oracle Automatically releases the temporary segment. However, if some

Installation steps: 1. Call the database script [$ Oracle_HOME/ctx/admin/catctx. SQL] To create the relevant schema --- CTXSYS (User) SQL> connect SYS/password as SYSDBASQL> spool text_install.txtSQL> @? /Ctx/admin/catctx. SQL change_on_install

This error is different from most of the answers on the Internet. The error is not a 32-bit rpm package. It was reported that a single line was commented out when the vipca was modified and read the vipca code, ah   Do not comment out the line arch =

Language _ region. Character SetSIMPLIFIED CHINESE_CHINA.ZHS16GBK Set nls_lang = 'simplified CHINESE_CHINA.ZHS16GBK'   Oracle modifies the server character set:SQL> SHUTDOWN IMMEDIATE; SQL> STARTUP MOUNT; SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION;

I. Preparations1. install various dependent packages in yum[Root @ WebServer ~] # Yum-y install gcc-devel gcc-c ++-devel autoconf * automake * zlib * libxml * ncurses-devel ncurses libgcrypt * libtool * cmake openssl -devel bison-devel unzip 2.

Oracle 10 Gb physical master database and slave database: Switchover: switches between the master database and the slave database under normal synchronization conditions. It is mainly used for Master/Slave maintenance and switchover drills; Failover

System Environment: Oracle Linux 5.5 x64 bit; Oracle version: Install Cluster and OracleSoft 10.2.0.1 (do not create instances), and upgrade Cluster and OracleSoft to 10.2.0.4; When dbca is used to create a database, the database stops at 88% and an

Create or replace Function GetInvitationNO (prev varchar2, num1 varchar2, num2 varchar2, sessionSetting varchar2) Return Varchar2 Authid Current_User Is PRAGMA AUTONOMOUS_TRANSACTION; -- you must use the "Current_User" permission to prevent you from