what is use of materialized view in oracle

) ----------------------------------------------------------------- Script file name (None) Help on the command options (None) Exec a set of commands (None) ----------------------------------------------------------------- From help, we can see that his syntax is similar to the following: 1.3.1 run commands directly $ Adrci exec = "show alert" 1.3.2 specify the script command $ Cat/tmp/abc.txt Show alert $ Adrci script =/tmp/abc.txt $ Adrci ADRCI: Rel

(1) Establish B*tree index 3:11:08 sql>create index Emp1_job_ind on EMP1 (Job); (2) Analysis of index structure 3:11:08 sql> ANALYZE INDEX emp1_job_ind VALIDATE STRUCTURE; Index analyzed. (3) View Index storage information 03:11:41 sql> SELECT blevel,leaf_blocks,num_rows from user_indexes 03:12:12 2 WHERE index_name= ' Emp1_job_ind '; Blevel Leaf_blocks Num_rows ---------- ----------- ---------- 0 1 14 03:12:26 sql> INSERT into the EMP1 SEL

Why is Oracle expdp faster than exp? What is the principle? First read the official oracle 10g documentation: Database Utilities Data Performance Improvements for Data Pump Export and ImportThe improved performance of the Data Pump Export and Import utilities

Reply to discussion (solution) Echo Phpinfo (); There is a constant call to see the Echo php_version;Echo Phpversion (); Echo php_version;Echo Phpversion ();Output:5.3.10-1ubuntu3.7Above outputThe PHP version is: 5.3.10-1?ubuntu3.7, what does that mean? Echo php_version;Echo Phpversion ();Output:5.3.10-1ubuntu3.7Above outputThe PHP version

Defined Data Mining is the nontrivial process of acquiring effective, novel, potentially useful, and ultimately understandable patterns from large amounts of data stored in databases, data warehouses, or other repositories. What is the use of. Data mining, simply said that there

values:Copy the Code code as follows:Mysql> SELECT @ @MAX_CONNECTIONS as ' MAX CONNECTIONS ';Set the value of this parameter:Copy the Code code as follows:Mysql> set GLOBAL max_connections=1000;(Note the upper case of the command)After the modification is complete, it takes effect in real time without restarting MySQL.Overall, this parameter should be set as large as possible when the server resources are sufficient to meet the needs of multiple clie

Use the 10046 event to view the Oracle execution plan You can use the 10046 event to view the execution plan in the Oracle database and get the logical read, physical read, and time consumed by each execution step in the SQL Execu

Unfortunately, Oracle encounters undo corruption while running. Of course, the best way is to completely recover it. But what if undo is damaged without backup? The following describes how to solve this problem. For more information, see If undo damage is unfortunately encou

If the command is passed, it is generally called JPS to view the specific PID, then call Jstat to see the runtime memory, and the frequency of the GC, and then through Jstack to see if the thread is blocking, deadlock, looping, and so on, finally through Jmap generated heap snapshot to analyze memory overflow.With Visu

Use flashback to view historical data of the Oracle table 1. View historical data of the table select * fromtab_testASOFTIMESTAMPto_timestamp ( Use flashback to view historical data OF the Ora