Oracle

Tablea Columna columnb A 1 & 2 SSS   Select * from a where Columna like '% 1 & 1000'; ------------------ the system prompts you to enter a variable. What if I want to query SSS Based on the clomna value? Analysis: & is a variable character

  Recently, you may need to connect to a remote ORACLE Server. Although many tools can be connected, such as dbvisualizer and navicat, it is well known that, pl SQL developer is incomparable to any other tool in Oracle operations. In addition,

-- You can periodically use the results of DF-h to input an External Log File, and then use Oracle's "External table" to access this "External Log File". For example: -- Step 1: write a script to regularly insert disk information into the log file: [

Reprinted from: http://www.iteye.com/topic/82587   The data dictionary dict always belongs to the Oracle user SYS.1. User:Select username from dba_users;Change PasswordAlter user spgroup identified by spgtest;2. tablespace:Select * From

Run the command in the Command window. Variable names after variable must be the same as those after job =>: job. Otherwise, the error "Not all variables are bound" will be reported. After successful execution, the job number is automatically

Once all the datafiles were on one disk, resulting in a dramatic increase in Io. Now we divide datafile into three hard disks (due to the large data size, we only consider dividing the data equally without moving the index ). 1. First view the

1. To create a global dblink, you must first confirm that you have the permission to create a dblink: Select * From user_sys_privs where privilege like upper ('% database link % ');   If not, you must use the sysdba role to grant permissions to

1. Download the Oracle client package (30 m) You only need Oracle can download a software named Instant Client package. This software does not need to be installed and can be used as long as it is decompressed. It is very convenient and can be used

Although talking about hidden parameters must be meaningless, but those hidden parameters are valuable, we have to "respect" those hidden parameters" In Aum, why does my undo tablespace only grow and does not recycle it? Now it's more than 40 GB

Make the program a soul By think 1 What is PL/SQL? Procedures, functions, and triggers are written in PL/SQL. The process, function, and trigger are in the Oracle System tablespace. PL/SQL is a very powerful database Procedural Language The function

This is the 25th lecture, mainly about the basic understanding of blocks and processes. 1. One of the simplest blocks:Set serveroutput on -- open the output option. If it is off, put_line () has no output.BeginDbms_output.put_line ('hello

(I) download and decompress RDA: Click to download [oracle@localhost vmshare]$ gunzip rda_4[1].1-051205.tar.gz[oracle@localhost vmshare]$ tar -xf rda_4[1].1-051205.tar[oracle@localhost vmshare]$ cd rda[oracle@localhost rda]$ lsDISCLAIM.txt

InWhen Sr is sent to Mos, how does v $ segment_statistics update it? ORACLE: V $ segment_statisitcs has been used for internal research since 9ir2 was introduced] (I) first look at the table structure: Sys @ orcl> DESC v $ segment_statistics

Two features of a role 1) role DelayDelayed How to enable the role to take effect immediately:Set role name;For example:Set role resource;Delay recoveryThe following experiment demonstrates the delay recovery:Session (1) SCOTT:Sys @ orcl> conn Scott/

    1 Definition An executable tool used to analyze Oracle tracking files and generate clearer and more reasonable output results as needed   2 preferences F:\>tkprofUsage: tkprof tracefile outputfile [explain= ] [table= ] [print= ]

When data is stored in a data file, its attributes are determined by the storage. These attributes include: in which data file? Which object does it belong? Where is the data block? Row number? These attributes are combined to form the rowid of

Statistics of dynamic sampling are not recorded in the view, and sometimes the tables that have been analyzed are also evaluated. It is effective for CBO because RBO does not need statistics, so dynamic sampling is meaningless. (I) Role of dynamic

(I) histograms Column chart? Histogram? Actually, these two concepts are called here by think directly using histograms. Histograms can be understood as the density and range of the approximate distribution of values in a column) In general, CBO

Sometimes, very depressing, ah, what's going on ah, don't take the index, If you find that you do not leave the index, but do not rashly impose your own will, You have to give a reason, do a test first, prove/false take index practical

Environment: sys@ORCL> select * from v$version;BANNER----------------------------------------------------------------Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - ProdPL/SQL Release 10.2.0.1.0 - ProductionCORE 10.2.0.1.0