Database Administrator

This is an SQL statement they developed Select id, title, createdate from table name order by createdate asc limit 334570,10; The person who asked this question meant reading the oldest news title and reading 10 records from 334570 rows of

  If an archived backup set exceeds the backup retention policy, report obsolete reports that it has expired. therefore, the Backup Redundancy policy is set to 1, and the archive is backed up twice. The report obsolete command is initiated to view

# Scripts are only used for communication and learning!# The current script version is 1. 0. implements the detection of physical memory and swap space. The RPM package is automatically installed (you need to configure Yum or attach the disc. If you

1: a power outage occurred on the weekend. The newly configured Intranet Test Database active recovery uard environment is automatically disabled. The following error is reported after the master database is started this morning: [oracle@db1 ~]$

Recently, it was found that there are too many logs in the binlog directory of mysql, and the disk space is full, resulting in Website access failure. -Rw ---- 1 mysql 1073742161 May 31 binlog.20.21 -Rw ---- 1 mysql 1073742892 May 31

What is Redis? Two sentences can be summarized as follows:1. It is a completely open-source and free key-value memory database.2. It is generally considered as a data structure server, mainly because it has a wide range of data structures, such as

1. Why is ROWID used?ORACLE uses ROWID as the unique identifier of the B-tree and its internal algorithm to mark the ROW.In versions earlier than ORACLE8, ROWID marks FILE, BLOCK, and row number, and uses only one numeric generation.Table FILE

A single-line string function is used to manipulate string data. Most of them have one or more parameters, and most of them return the string ascii () C1 is a string and returns the ascii code of the first letter of c1. Its Inverse Function is chr ()

Both MobiLink and SQL Remote can provide data replication between a unified database and a group of Remote databases. The unified database contains all the data to be copied. A remote database is a copy of a unified database. It can be located on

1. query the execution plan of the statement being executed (that is, the actual statement execution plan)Select * from v $ SQL _plan where hash_value = (select SQL _hash_value from v $ session where sid = 1111 );The id and parent_id indicate the

ORACLE 8.0.XSGA = (db_block_buffers * block size) + (shared_pool_size + large_pool_size + log_buffers) + 1 MBORACLE 8.1.XSGA = (db_block_buffers * block size) + (shared_pool_size + large_pool_size + java_pool_size + log_buffers) + 1 MBIn theory, SGA

Use Oracle Wrap tool to encrypt your code Oracle provides Wrap tools to encrypt your Package. However, the encrypted code cannot be decrypted. You need to keep your source code safe. The following is an example: 1. Source Code Create or replace

In large commercial applications, Remote Disaster Recovery and backup of data are very important and necessary. Based on my practical experience, I have designed a simple method to implement automatic backup of remote data for the reference of

There is often a need to operate databases on the Internet to unify similar database applications across cities across the country. The data changes on one node are not only reflected locally, but also to the remote end. The replication technology

Before executing an SQL statement, Oracle needs to analyze the statement execution plan and then execute it according to the execution plan. The execution plan of the Analysis Statement is completed by the Optimizer. In different cases, an SQL

I. Optimizing mysql during compilation If you distribute and install mysql from the source code, note that the compilation process will have an important impact on the future target program. Different compilation methods may obtain similar target

When you Access 2000 using DAO, will the following error message be displayed? "Run-time error 3343 Unrecognized Database Format XXX" There are two ways to solve this error: 1. If you use Data Control to connect to the database of Access 2000:

Affected Systems:Oracle Database 9.2.0.0-10.2.0.3 Description: Bugtraq id: 17426 Oracle is a large commercial database system. Oracle 9.2.0.0 to 10.2.0.3 allows users with only SELECT permission in the base table to insert, update, and delete data

The hints adjustment mechanism used by Oracle has been very complex. Oracle Technical Network has a good overview of the process of using hints to adjust Oracle SQL. According to the introduction of 10 Gb database, more new optimizer hints can be

Preface The increasing demand for distributed applications requires a better distributed software environment, which constantly promotes the development of distributed technology. Oracle Data replication is a technology that implements a