Database Administrator

Nowadays, more and more projects are using report tools. However, there are many report tools on the Chinese market, which are mixed. In the face of so many products, it is difficult to distinguish between advantages and disadvantages from one

For multi-dimensional analysis, the rough and fast solution is to use ROLAP (Relational OLAP. Data is stored in MySQL after dimensional modeling. The ROLAP engine (such as the open-source Mondrian) is responsible for converting OLAP requests into

ORA-19809: exceeds the limit on the number of recovery filesI. Fault symptom:RMAN> backup database;Start backup fromUse the target database control file to replace the recovery directoryAllocated channel: ORA_DISK_1Channel ORA_DISK_1: sid = 158

CSDN for the format of support is relatively weak, you can look at the http://user.qzone.qq.com/88285879/blog/1399382878 to see consistent content. New features in Performance Tuning Guide 11G This chapter describes the new performance adjustment

Atitit does not respond when querying the table to modify the table field -- unlocking the locked tableNo response is returned when modifying table fields in the query table.If the gui does not respond, it is best to use the cmd method. No need to

Requirement: Import multiple NTS that meet the conditions in the oracledata database into a csv1_file and store them with the table name. CSV as the file name. Implementation: It is implemented through the UTL_FILE function in the stored procedure.

Source Code address of Cobar-Server: GitHub welcomes Fork. For more information about the Cobar network communication module, see,   Cobar uses Java NIO for read/write processing. NIO is the IO reuse in Java, without the need to create a

: Wget http://download.redis.io/releases/redis-2.8.8.tar.gzInstall steps:1 downloadOfficial Website: http://redis.io/Address: http://redis.io/documentationMaster-slave copy document address: http://www.redis.io/topics/replication2. decompress and

ZookeeperThere is a mysql database table. The result of querying the last two pieces of data is as follows: This is the content in the original table: Idname 1 ad 2 jk 3 tre 4hgv This is the last two pieces of data to be queried (for the latest

#include #include #include #include #include #include #include #include void writeExcel(QString excelFilePath){// Create a database instance and set the connection string QSqlDatabase db = QSqlDatabase::addDatabase("QODBC","excelexport");

ACID refers to the abbreviation of the four basic elements for correct execution of database transactions. Includes: Atomicity, Consistency, Isolation, and Durability ). A database system that supports transactions must have these four features.

Question: The following data exists in the database to calculate the user's final balance. User Type Amount A Save 100 A Save 200 A Retrieve 100 A Retrieve 200

The last time I took a note, I learned how to query multiple tables. This time I took a note to learn about grouping functions in Oracle. First, let's take a look at what group functions are: Group function: acts on a group of data and returns a

Www.ithome.com: In the circle of friends, press 8 to enter 50 lines to suffocate? "88888...", recently, many citizens have found that many of their friends posted 8 in the circle of friends. It turns out that this is a recent popular game of

After a few days of study, you can basically try to write some small programs to play with it. Before that, do a few preparations. A: My first response to big data is how the data in the existing relational database can be used in combination

I learned the operations related to query and create a management table from my previous notes. This time, I learned how to process data, including inserting data into the table and updating data) and DELETE data ). To save the original data of emp,

Some enterprises are using non-relational databases such as mongodb in Kunming. Therefore, they must have basic knowledge of non-relational databases in any case, this time I sorted out some of the most basic operations for adding, deleting,

I have been entangled in the implementation of the database connection pool. Today, I have finally squeezed out time to implement it. Before tomcat, the connection pool was implemented using dbcp. dbcp has many disadvantages. Currently, tomcat uses

Overview:===============An archive gap is a range of missing archived redo logs created whenever the standby system is unable to receive the next archived redo log generated by the primary database. For example, an archive gap occurs when the

The tool named Big Data Lite is bundled with Oracle Linux, Cloudera software, Hadoop, and a large number of Oracle cloud connectors to replicate available environments on Oracle's Big Data all-in-one machine. This bundling tool is provided to