Oracle

1) acess_info_null The exception corresponds to the ORA-06530 error code. When developing an object type application, you must initialize the object before referencing the object property. If the object property is directly referenced without

1. List dates If you know the start date and end date, how can you use an SQL statement to get all the dates in this period. Eg:Known:2007/04/25 2007/05/02It is concluded that:2007/04/252007/04/262007/04/272007/04/282007/04/292007/04/302007/05/012007

I have performed a full Oracle database backup. I don't know if it is correct. A backup file is generated. I checked a lot of information and found many methods. I still use exp, which is simple. I will study the differences later. Exp

In oralce, I found the add_months function. You can use the following method to add the number of days n. Select sysdate + N from dual In oralce, I found the add_months function. You can use the following method to add the number of days n. Select

// Restart the server reboot Telnet 172.21.1.11 Enter User Name Enter Password Su-Oracle Export oracle_sid = orcl // database instance name LSNRCTL start // start the listener Sqlplus/nolog // open sqlplus Conn/As sysdba Startup // start

1. The select into statement requires at least one record of the select result;If RS is null, no_data_found exception is thrown. Therefore, exception capture is required; 2. When performing update and delete operations, you can replace the PK with

In Java Development, we often use the long type to save the time for convenience. currenttimemillis () or Java. util. date. gettime (). The value is the number of milliseconds between the current date and the 1970-01-01; However, in Oracle,

What can I do if I continue my experiment for 10 minutes today? I chose to introduce Oracle indexes. The results are as follows: Search for information from Google:1: 15 seconds. Read the overview section:3: 15 seconds. Oracle indexes mainly include

Oracle tablespace Design Tablespace design principles: 1. assign different tablespaces to tables and indexes. 2. assign different tablespaces to the formal and historical tables to improve data security. 3. assign a separate tablespace for the big

Oracle storage hierarchy Overview1) A database consists of one or more tablespaces.2) a tablespace consists of one or more files. The files that make up the tablespace can be various files in the file system, and the tablespace contains segments.3)

Association is the most useful in Oracle Data Query. Flexible applications can solve many practical problems. The following are some examples: Create a tableCreate Table AB(AB _id number (5 ),AB _name varchar2 (30));Create Table bb(Bb_id number (5

Oracle configuration file introduction: Profile file, oratab file, database instance initialization file initsid. ora, Listener Configuration File, sqlnet. ora file, tnsnames. ora File 1.2 introduction to major Oracle configuration

KingSoft Antivirus online update module is an online anti-virus update module.The ActiveX control in the online upgrade module of KingSoft Antivirus improperly processes user-submitted parameter data. Remote attackers can exploit this vulnerability

To be accurate, a week starts from Sunday to Saturday, and our habits are that the first day of a week is Monday, and the last day is Sunday. Many query conditions and statistics require a period of one week, that is, the period from Monday to

OverviewEnabling the database to automatically start when the operating system starts makes database maintenance easier and more convenient.I have written an article "Oracle Auto Start and Stop in Linux (I)" http://blog.csdn.net/chenxiao#/archive/200

Modify the Oracle system configuration file/etc/oratab/Etc/oratab format: Sid: ORACLE_HOME: AutoSet the auto domain to Y (uppercase). Only in this way can dbstart and dbshut of Oracle be used. Mine is:$ Oracle_sid: $ ORACLE_HOME: YHere, oracle_sid

MySQL, sqlserver, and Oracle databases are queried by page The database implements the paging query method.I,MySQL database paging QueryThe implementation page of MySQL database is relatively simple, and the limit function is provided.

1. Check the table space name and size. Select T. tablespace_name, round (sum (Bytes/(1024*1024), 0) ts_sizefrom dba_tablespaces T, dba_data_files dwhere T. tablespace_name = D. tablespace_namegroup by T. tablespace_name; 2. view the names and sizes

-- Controlfile/* examplaestartup nomountcreate controlfile reuse Database "x201006" noresetlogs noarchivelog maxlogfiles 16 maxlogmembers 3 maxdatafiles 100 maxinstances 8 maxloghistory 292 logfile group 1 'd: \ oracle \ product \ 10.2.0 \ oradata \

########## Managing Tables ############/* char type maxlen = 2000; varchar2 type maxlen = 4000 bytesrowid is an 18-bit 64-digit string (10 bytes 80 bits) consisting of rowids: Object # (object number) -- 32 bits, 6-bit rfile # (relative file number)