Database Administrator

Oracle Database time and system time There is a huge gap between Oracle Database time and server system time, resulting in data confusion and report errors. The difference between database time and system time is about 16 hours. The details are

Oracle 11gR2 changes the user, causing the system to HANG [Background] at noon today, the user reported that the connection password between the database and the application needs to be modified, and the password should not be changed. I did not

An error occurred while using DBCP in AbstractMethodError. An exception occurred while using DBCP. Error description: Exception in thread "main" java. lang. AbstractMethodError: com. mysql. jdbc. Connection. isValid (I) ZAt org. apache. commons.

Quickly build a slave Database Based on mysqldump Mysql master-slave architecture is generally divided into three steps: one is to add the parameters required for replication to the master instance and the other is to create a snapshot in the master

Alert output when alter database open resetlogs, alterresetlogs SQL> alter database open resetlogs; Database altered.Prompt: ORA-279 signalled during: alter database recover datafile 5...ALTER DATABASE RECOVER CANCELMedia Recovery CanceledCompleted:

ORA-01189: file is from a different RESETLOGS than previous files,   Create controlfile reuse database "EDWPROD" resetlogs archivelog * ERROR at line 1: ORA-01503: create controlfile failedORA-01189: file is from a different RESETLOGS than

Aerospike-Architecture series Data Model, aerospikeData Model) Aerospike uses schema-less data models, which means that the data stored in the database does not conform to the strict mode. This gives you the flexibility to store data in

Oracle inspection script and oracle Inspection   #! /Bin/sh # Get HostnameHOSTNAME = 'hostname' Logfile = xunjian _ 'date + % y % m % D'. logHostinfodir =/home/oracle/xunjian If [[! -D $ hostinfodir]ThenMkdir-p $ hostinfodirFi Date> $ hostinfodir/$

MySQL obtains the continuous range. mysql obtains the range. 1. Raw Data 2. Convert running_number into data and add an ordered number to the column. SELECT d. running_number + 0 running_number, @ a: = @ a + 1 rn FROM device_data d, (SELECT @ a:

C # using DataTable to access data, DataTable Introduction: http://www.dotnetperls.com/datatable Retrieve Data Example of saving SQL results to DataTable: http://stackoverflow.com/questions/6073382/read-sql-table-into-c-sharp-datatable Example code:

Import the data in the text file to the mysql database. For example, import the data in the text file to the mysql database.My own implementations can be divided into several types:1. Write the programming language you are good at to read and

Database design instance (2) Multi-table joint query, database instance Tested at oracle10g: I. Question requirements Books)Book_id book_name creatdate Lastmodifydate decription 001 the world of three persons NULL Author table (authors) A_id A_name

Clustering by fast search and find of density peaks code details, clusteringpeaksZookeeper The Clustering method Clustering by fast search and find of density peaks published in Science in 2014 is not described here. The detailed comments of its

Install Mysql in Linux and mysql in linux First, let's talk about Linux. I have to clean it. It's really a headache to use it through command lines. Many people say that I have enough Linux servers with the lowest configuration, but I really feel

[Hibernate] Hibernate cluster query, grouping query, sorting and time difference, hibernate Cluster In Hibernate, HQL statements can basically implement what SQL statements do, just as jQuery does javascript. Although the HQL statement is a query of

[Mysql] calculates the item that is different from the last X days. The SQL statement compares the date and mysqlsql For the following testtable table Use the following SQL statement: Select * from testtablewheretimestampdiff (year, date, now

MySQL 'root' @ 'localhost' cannot be logged on, mysqllocalhost This morning, my colleague said that the MySQL root Account could not be logged on. I tried it.# Mysql-u root-pPrompt "Access denied for user 'root' @ 'localhost' (using password: YES )"

Oracle Database Import and Export, oracle Import and ExportI. PreparationsCreate a tablespace:Create temporary tablespace yangwen_tempTempfile 'd: \ oracle \ oradata \ orcl \ yangwen_temp.dbf'Size 50 mAutoextend onNext 50 m maxsize 20480 mExtent

DS sequence tables merge two non-decreasing linear tables, ds linear As early as I wrote a linear table, I mentioned this complicated operation. Today we will merge it. It is known that the data elements in the order table La and Lb are arranged in

If an archive log is deleted, the offline datafile cannot be accessed. An archive log is deleted and the offline datafile cannot be accessed. In fact, it is more appropriate to change the title to "rebuid online index encounters the problem of