Database Administrator

1. the mysql-client package needs to be installed on the client. The library files we need after installation are complete; 2. Install the mysql-dev package. After installation, we need the mysql. h file; 3. As a client, you only need to install

If you need to directly operate the database and write SQL scripts to create a spatial database, you must note that you need to write some necessary metadata information into the corresponding table after creating the database, then insert row data

Early Stage 1: Download Oracle for linux (x86) and upload it to Linux 2. Preparations before installation:1. Hardware requirements. Test the idle space of the installation directory as long as 5 GB is left empty. The memory is above MB, and the CPU

Create test tableSQL> create table a (a date ); The table has been created. Create a custom ProcessSQL> create or replace procedure test2 begin3 insert into a values (sysdate );4 end;5/ The process has been created. Create a JOBSQL> variable job1

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

To improve the performance of the Rsyslog + MySQL + LogAnalyzer system, we made a partition table for MySQL. The results showed that the problem could not be solved fundamentally. A feasible solution may be like a storm: one table per day. A system

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

My system is RedHat 5.5 64-bit, Oracle is 11G R2 Oracle 11g uses jdk1.5. After jdk1.5, a simple solution is provided to solve this problem. You only need to create a fallback directory under $ JAVA_HOME/jre/lib/fonts, copy the font you want to use

In Oracle, it is a Long type. How to obtain, insert, and modify it in Java: Reader reader = rs can be used online. getCharacterStream (1); get Long data, but I use ds directly. no error is reported when getString () is obtained, and the database is 9

Using the flash back table feature in Oracle Database 10 Gb, you can easily restore accidentally deleted tables. The following is a situation that should not happen frequently: the user deleted a very important table-of course, accidentally

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.

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

Environment: linux x86 64 10.2.0.1 Error: sqlplus/as sysdba ORA-01031 insufficient privileges while sqlplus sys/password as sysdba can login Check: Once you rename the orapwd file, sqlplus sys/password Logon also fails, proving that the password

Run Eclipse, create a new Java project "HBaseClient", right-click the project root directory, select "Properties"-> "Java Build Path"-> "Library"-> "Add External JARs ", after HBase is decompressed, all the jar packages under the

Use rowid to simulate the restoration process of Bad blocks in the database: 1. Rowid definition (official website)A globally unique address for a row in a database.Oracle Database uses a rowid to uniquely identify a row. internally, the rowid is a

Recently, I contacted the monitoring platform Zenoss, which involves the Oracle plug-in ZenPacks. community. OracleMon. To use this plug-in, you must install Python cx_Oracle. Next, let's talk about how to install it. 1. software packages involved 1.

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

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

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