Database Administrator

Oracle 11g Data Pump details Oracle Database 10 Gb introduces the latest data pump technology, the role of Data Pump Export Import (EXPDP and IMPDP) 1. Logical backup and logical recovery 2. move objects between database users 3. move objects

New feature 3 of Oracle12c -- ASM & Grid, oracle12casm 1. Enhancements to Automatic Storage Management (ASM) 1.1. Flex ASM In a typical Grid Architecture Installation, each node has its own ASM instance running and plays the role of the database

495th questions, 053495495. Which statement is true regarding the validate database command?A. It checks the database for intrablock before uptions only.B. It checks for block upload uption in the valid backups of the database.C. It checks the

When and how do I enable MySql logs ?, Enable mysql LogIf you are a web developer and want to debug your application or improve its performance, you need to refer to various log files. Logs are the best choice for troubleshooting. For the famous

SQL Server imports table data from another database. Data import and export are required when SQL Server programming or management is involved. There are many ways to import and export data. Here we take SQL Server as an example to describe how to

An error occurred while checking Network Configuration Requirements during Oracle database installation. Error message: Checking Network Configuration Requirements... check complete. The overall result of this check is: Failed Tip: configure the

SQLServer filters out special characters in the file name (using SQLServer to modify the physical address name of the file) and special characters in sqlserver Declare @ cmd nvarchar (2000) declare @ messageid nvarchar (200) declare @ serialid

[Translated from mos] Do I need to manually set the CLUSTER_DATABASE parameter during dbua upgrade ?, Clusterdatabase Do I need to manually set the CLUSTER_DATABASE parameter when using dbua upgrade?Source:Is Manual Setting Of CLUSTER_DATABASE

Innodb optimistic insertion fails due to insufficient space and enters the pessimistic insertion stage. The size of this space is limited in innodb stage. Btr_cur_optimistic_insert { ... /* Check whether there is sufficient space for future record

Connect Java to MySQL and javamysql 1. Download and install Connector/J at http://www.mysql.com/products/connector /. Connector/J is a JDBC driver package specially developed for MySQL.2.mysql-connector-java-5.1.36-bin.jarAdd the classpath to the

MySql storage engine SelectionThe storage engine is a MySql component that processes SQL operations for different table types. InnoDB is the default and most common storage engine and is also officially recommended unless in some specific cases. The

After installing SQL Server, the system prompts "overlapping IO operations in progress". sqlio   The organization has built a new virtual machine and plans to deploy a. Net SQL System. The system is Server 2008 R2, and there is no software except

Conversion of rows and columns in Hive1. Demonstrate converting multiple columns into a single rowData File and content: student.txtXiaoming | english | 92.0Xiaoming | chinese | 98.0Xiaoming | math | 89.5Huahua | chinese | 80.0Huahua | math |

Redis installation tutorial, redis tutorial Redis is one of the most popular NOSQL databases. The following describes the installation process of redis:1. installation environment Introduction: Redis edition: redis-3.0.1Linux: Red Hat Enterprise

LeetCode_Mysql_Second Highest Salary, leetcode 176. Second Highest Salary 1. Problem description: Write an SQL statement to get the second highest salary from the Employee table. 2. solution: This question is very simple, so it is time to warm

Install and compile xtrabackup 2.2.11, axtrabackup ---- 1. compile and install percona-compiler-y install cmake gcc-c ++ libaio-devel automake autoconf bzr \ bison libtool ncurses-devel ncurses5-devel zlib-devel libgcrypt-devel crypt * libgcrypt *\

Query the record set of the Linq able using linq, and query the datatable using Linq. Query a dataset that meets the conditions in a able data set through linq 1. First define the variables of the query field, such as depth String strDepth = query

MySQL profiling usage, mysqlprofiling The two most common bottlenecks of MySQL databases are the CPU and I/O bottlenecks. When the CPU is saturated, it usually occurs when the data is loaded into the memory or the data is read from the disk. The

Common shell for mongodb and mongodbshell > Use cmd_test // create a database Switched to db pai_test > Db. createCollection ("test") // create a table as a set. {"OK": 1} > Db. Db. addUser (db. group ( Db. adminCommand (db. groupcmd ( Db. auth (db.

MySQL (14) ---------- transaction processing, mysql ---------- The previous article's blog on transaction processing was not clearly written, difficult to read, and difficult to understand. So I have organized some documents to help me understand.