Database Administrator

Why does MongoDB say "Do what you have never done before" (1) On the MongoDB website, it introduces itself to Do What You have Never done Before (Do What You cocould Never Do Before ). Why does MongoDB dare to say this? What are its strengths and

Implement incremental update in Hive and incremental update in HiveAn insurance company has a table that records the customer information, including the customer's id, name, and age (only these fields are listed for demonstration ).Create a Hive

Impdp when encountering ORA-31693 & ORA-31640 & ORA-19505 & ORA-27037, impdpora-31693ORA-31693 & ORA-31640 & ORA-19505 & ORA-27037An error occurred during impdp:Additional information: 3.. Imported "HQ_X1". "T_XX130901": "SP15" 13.99 KB 0 rows..

SQL statement execution sequence The following figure shows the execution sequence of SQL statements: (This figure is from the SQL statement execution Sequence Graph) This picture clearly shows the execution sequence of SQL statements. Today,

Hibernate (Object-Oriented Database Operations) and hibernate object-orientedJPA, java persistance api, java persistence layer interface, that is, some interfaces dealing with databases. The implementation is handed over to various vendors for

Database Control is abandoned after Oracle Database 11.2, oracle11.2 Database Control is abandoned after Oracle DB 11.2Reference:Database Control To Be Desupported in DB Releases after 11.2 (Doc ID 1484775.1) Applicable:Oracle Server-Enterprise

Replication completes the configuration of m-s (master-slave), replicationm-sReplication completes m-s Configuration in a few steps1. grant permissions on the masterGrant replication slave on *. * on 'sync' @ 'slaveip' identied by 'Password ';Flush

Upgrade the current replication to GTIDs and replicationgtids.Upgrade current replication to GTIDsPut all the master and slave1. Put all the master and slaveSet @ global. read_only = on; or set global read_only = on;2. Put all the master and

Oracle SQL optimization 2 and OracleSQL optimization 2After receiving an SQL statement submitted by the developer, it is slow in high concurrency and can be optimized:This SQL statement is used to perform Left join on another table. First, let's

11gR2 OUI: System Class and Desktop Class, 11gr2oui 11gR2 System Class and Desktop Class on the OUI installation Interface From: 11gR2 Install (Non-RAC): Understanding New Changes With All New 11.2 Installer (Doc ID 884232.1) New screen "System

SORTEDSET for Redis data type, redissortedset Web programmer blog: http://blog.csdn.net/thinkercode Sorted set type-Features Sorted set is an upgraded version of set. It adds an ordered Attribute Based on set. This attribute can be

Detailed installation tutorial for MySql5.6 Window, mysql5.6window Original works of Lin bingwen Evankaka. Reprinted please indicate the source http://blog.csdn.net/evankaka Directory I. Installation Package preparationIi. Start InstallationIii.

Remote connection to MySQL in CentOS: Can't connect to MySQL server on 'xxx' (13), centosmysqlEnvironment: System Version: CentOS release 6.5 (Final) Database Version: 5.1.73 Problem description: Use the client to remotely log on to Mysql on the

Information_schema in mysql (similar to the system table in SQL) and mysqlschema Information_schema database table description: SCHEMATA table: Provides information about all databases in the current mysql instance. Is the result of show

MySQL (1) ---------- data type, mysql ----------Data Type Note: The following content is applicable to MySQL and later versions. MySQL has many data types. Selecting the correct data type is crucial for achieving high performance. This article is

Spring programming transactions and spring Programming Take a look at the configuration file (simple configuration) $ {jdbc. driverClassName} $ {jdbc. url} $ {jdbc. username} $ {jdbc. password} Spring Transaction Manager

PowerDesinger: object relational diagram-> physical data model (relational table)-> SQL statement-database, powerdesingersql I have heard of PowerDesinger before, but I have never used it. This time, I took over the Basic Course Selection module and

MySQL Optimization-operators and mysql Operators Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46560499 Security equals operator () This operator and = Operator perform the same comparison operation, but can

MySQL Optimization-simple syntax and mysql Optimization Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/465592711. Default Constraints --mysql CREATE TABLE emp ( id INT DEFAULT 12 )2. Set the

MySql statement Daquan: Create, authorize, query, modify, and so on, mysql statementOriginal works of Lin bingwen Evankaka. Reprinted please indicate the source http://blog.csdn.net/evankaka1. User Creation, permission, and deletion 1. Connect to