Oracle

When the following prompt appears in Oracle: A ora-01034: oracle not available Ora-27101: shared mermory realm does not exist It can be solved in this way; Method 1: 1. Input: connect/as sysdba; 2. restart the computer; Method 2: Enter C:>

No one would deny that Oracle is one of the most influential database products in the world; but good things do not seem to be so useful (it seems at first ), even a bit heartless-it always gives layman a heartless error number. The following is my

Oci_bind_by_name (resource stmt, string ph_name, mixed & variable [, int maxlength [, int type]) The first thing to note about this function is the maxlength parameter. You need to take a closer look at the descriptions in the manual:The length

The RAC feature in ORACLE protects instances, while the RMAN feature maintains data, while the replicuard feature is that instances are connected with data in a "guaranteed" manner, these three features work together to build a secure, reliable, and

We often create or delete indexes on the database. Because the index has a great impact on SQL Execution performance, it may become very good or very poor, in the offline development environment, we can fully test whether indexes can be created or

801. ALL_DIM_HIERARCHIESDisplays the dimension levels. 802. ALL_DIM_JOIN_KEYDescribes the connection between two dimensions. 803. ALL_DIM_LEVEL_KEYDescribes dimension columns. 804. ALL_DIM_LEVELSDescription dimension level. 805.

User-managed backup and recovery, also known as OS physical backup, refers to the use of database commands to set the database to the backup status, and then use the operating system commands to copy files to be backed up or restored. This backup

3.7 Stoplist attributes Stoplist allows you to block some commonly used words, such as is, a, and this. It is of little use to index these words. By default, the stopword dictionary corresponding to the database language is used. Language that are

3.9 highlight Not to highlight the content, but to return the position of all hit words in the document and the length of the hit words. In this way, the user obtains the length and offset of the content to be highlighted while obtaining the

Oracle modifies dbid and dbname. Generally, This is not modified unless in special cases, such as database cloning. Step 1. back up the database 2. start data to mount status 3. nid command modification (if you only modify the dbid, you do not need

Automatic Memory Management and statistics_level Automatic Shared Memory Management simplifies the configuration of the SGA. to use Automatic Shared Memory Management, set the SGA_TARGET initialization parameter to a nonzero value and set the

In Linux, sqlplus cannot use the up or down key. The first step is to install the readline package on the installation disc of readline centos. Find and install all packages starting with readline. [Root @ oracle11g ~] # Rpm-ivh readline *  Step 2:

Core data file backup and recovery (system tablespace data file) key data files are divided: SYSTEM tablespace data files and UNDO_TABLESPACE undo_tablespace UNDO_TABLESPACE undo tablespace data files can be queried through the undo_tablespace

Oracle view, sequence and synonym, set operation 1. View (important) function: A View encapsulates a complex query statement. 1. syntax for creating a view: Create view name AS subquery example: create view empv20 as select * FROM emp WHERE deptno =

Use PL/SQL to execute OS commands [SQL] create or replace and compile java source named ExeSysCommand as import java. io. *; public class ExeSysCommand {public static String ExeCmd (String args) {Runtime run = Runtime. getRuntime (); Process process

An interesting test SQL> show recyclebinrows will be truncatedORIGNAME_PLUS_SHOW_RECYC OBJECTNAME_PLUS_SHOW_RECYC OBJTYPE_PLUS_S-------------------------------- ------------------------------ --------------EMP_1

Oracle Database Programming: You can use a cursor in PL/SQL to obtain data using a cursor in PL/SQL. A cursor can be divided into an implicit cursor and a display cursor. A cursor is directly associated with a database equivalent to a global

Step 1. step 1. shut down the database normally. 2. place the database in the mount status. 3. change the database to archivelog mode. 4. open the database 5. close the database normally and make a full backup sQL> conn / as sysdbaConnected to an

Oracle maintenance commonly used statement instance Article as a friend interested in oracle, will certainly be interested in this article oracle maintenance commonly used statement examples. View the table space name and size: Select t. tablespace_

The use of Hanganalyze is important to find the reason hangs the database. how can we do, is a headache thing. and we can use oracle internal tool to find the cause, which is hanganalyze. level of hanganalyze [sql] 10 Dump all processes (IGN state)