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To implement this function, we can use the rmanduplicate Method and Its simple method. The duplicate method is different from the OS-level backup, it will be a secondary database (Clone We can use the rman duplicate Method and Its simple method to

Take the example in PostgreSQL9.2 official document as an example: Remove duplicate rows of data to the new table weather_temp Take the example in PostgreSQL 9.2 official document as an example: Remove duplicate rows of data to the new table weather_

However, the premise for DBA to perform the connect operation is that oracle services (OracleServicelt; sidgt;) are in the ldquo; rdquo; State, that is, when the data However, the premise for DBA to perform the connect operation is that oracle

In Oracle10g, there is a single-Table query SQL statement, which does not have a where clause, but simply calculates the maximum and minimum values of a column at the same time. According to our understanding, it should undergo full index

Multiple methods are used to back up Master data. All the data is recovered from the server. Before backup, record the name and POS of the binary log file being used on the master server Multiple methods are used to back up Master data. All the data

[Oracle] dbms_metadata.get_ddl usage Summary [Oracle] dbms_metadata.get_ddl usage Summary Dbms_metadata.get_ddl () is used to obtain the object DDL. Its usage is as follows. Note: In sqlplus, the following parameters must be set to better

We can see that the number of rows to be retrieved is about 100% of the table's rows, so the optimizer does not choose to use the index. The optimizer of the Mysql database uses the EXPLAIN rows field to estimate We can see that the number of rows

When oracle starts a transaction to modify the data in the table, the modified data (row data) will be copied to the undosegment (represented in a circle because it represents When oracle starts a transaction to modify the data in the table, the

After the Oracle database has been upgraded to 11 GB recently, some problems have occurred. I began to find some things that need to be summarized. Every time I thought: next time, I will build my own data warehouse After the Oracle database has

My redo disk write speed has reached the maximum value, no matter how I adjust the redo size and number of groups, no matter how I adjust the checkpoint frequency is useless. Adjust redo size My redo disk write speed has reached the maximum value,

My experiment environment is CentOS5.5, a 32-bit system. In CentOS, we usually use yum to install related software. Let's just talk about it. Let's start with yum: My experiment environment is CentOS 5.5, a 32-bit system. In CentOS, we usually use

RMAN recover mdash from different machines; mdash; backup set permission problems RMAN recover mdash from different machines; mdash; backup set permission problems I received an email this morning and saw the failed rman recovery email sent by

Today I found that the character set of an Oracle Test Library is incorrect, the original character set is UTF-8, the correct character set should be ZHS16GBK, because the UTF-8 is the superset of ZHS16GBK, Today I found that the character set of an

When executing DML statements in Oracle, You need to display the information for submission. When we insert a trigger, it will trigger the trigger to execute various operations on the trigger action table and extended table. When executing DML

1. display the ChenZwgt; showparameterundoNAMETYPEVALUE ------------------------------------------------------ parameters related to the rollback segment -------------------------------------------- 1. display the ChenZwgt; show parameter undo name

There are some differences between Fedora18 and earlier versions, so it cannot be the same as before. Use # yuminstallmysql-servermysql to start the mysql server There are some differences between Fedora 18 and earlier versions, so it cannot be the

Oracle does not distinguish whether tables or indexes are stored in tablespaces. When the data volume is small, you can place tables and indexes in the same tablespace, but as the data volume increases Oracle does not distinguish whether tables or

Data is a very important data and often needs to be backed up, which is difficult to manually perform each time. This script is mainly used to back up and retain MySQL Databases in CentOS for the last 15 years. Data is a very important data and

The original database is ORACLE11G11.2.0.3 and runs on 64-bit WINDOWS. It uses RMAN for a backup and uploads the backup file to home‑lermanbac on the Linux server. The original database is ORACLE11G 11.2.0.3 and runs on 64-bit WINDOWS. It uses RMAN

First of all, you need to pay attention to several issues before installation: 1. In the etchosts file, the hostname of the local machine must correspond to lo (if you have changed the hostname, First of all, you need to pay attention to the