Database Administrator

How to recreate the RAC Control File In the following situations, you may need to recreate the control file: O all control files are damaged or lostO no backup for the control file or the backup is damaged The following describes how to reconstruct

MySQL 5.7 enhances root user login security After MySQL5.7 is installed, a random password will be generated in the root directory when it is started for the first time. The file name is . Mysql_secret Log on with a random password, and then use

Clone a database through RMAN on a different machine When RMAN is used for replication, RMAN will connect to the target database and the secondary instance. If catalog backup is used, it will also connect to the recovery directory. When RMAN

Oracle Database Connection detection (Shell), oracle Database ConnectionVersion 1 Oracle Database Version: Oracle Release 10.2.0.1.0 System Version: Red Hat guest iselinux 5.4  2 Check Step 2.1 write Shell scripts Edit the check_oracle_connection.sh

Oracle analysis function ntile, oracle function ntile With such A requirement, the scores of the course are divided into four levels to provide A, B, C, and D Performance for students. Drop table course purge;Create table course(Id number,Grade

Java MySQL database transaction processing, javamysql Transaction Processing Process 1. Disable the automatic submission Function 2. process transactions 3. Restore the automatic submission Function Code instance Data Table before executing the

PL-SQL storage functions and stored procedures, pl-SQL stored proceduresZookeeper PL-SQL storage functions and stored procedures ORACLE provides the ability to store PL/SQL programs in databases and run them anywhere. This is called a stored

How to access MySQL database in C Language 1. Add the header file path (include path in MySQL installation path) 2. Add a library file (copy libmysql. lib directly from the MySQL installation path) 3. programming Database Operations Code //

(Soft engineer video summary 2) Let's refine and refine our knowledge The conclusion in the previous article is to link the previous big knowledge, but for better understanding, we need to refine the knowledge. Next we will talk about the module

Oracle backup Import * *** If you want to save it as a bat file, you 'd better use Chinese Characters Import: Imp clsoftoa/clsoftoa @ orcl124 -- username/password of the database to be imported @ Database Name Fromuser = 'clsoft 'touser =

Drop dual, dropdualSome netizens have problems deleting dual tables: When the dual table is deleted, hang stays, and then shutdown abort directly. When you restart the database, you find that the database remains in the hang State during the open

Similar to group by's group count function, group by counts Previously, my colleague sent a statement to implement a simple function, similar to the group by grouping and counting function, because the where condition has the like condition and

DB2: view the execution plan and db2 execution plan In DB2, it is not convenient to view the SQL Execution Plan for other databases. Several steps are required. Here I organize the steps into shell scripts for ease of use, as shown below: #!

When pfile is used to start an oracle instance, startup fails --- the db_recovery_file_dest parameter value does not exist on the OS ., Oraclepfile[Oracle @ vm22 ~] $ Export ORACLE_SID = orcl[Oracle @ vm22 ~] $ Sqlplus/as sysdbaSQL * Plus: Release 10

PL/SQL flow control statements, plsql flow statementsZookeeper PL/SQL flow control statementsThis section describes PL/SQL flow control statements, including the following three types:Control statement: IF statementLOOP statement: LOOP statement and

Mysql-optimized BTree index and mysqlbtree Index Start with a question: Suppose a table has a joint index (c1, c2, c3, c4). Only c1, c2, and c3 parts of the joint index can be used.A where c1 = x and c2 = x and c4> x and c3 = xB where c1 = x and c2

PHP Redis operations, phpredis class /*************************************** **************************************** * ** InitPHP 2.0 domestic PHP development framework Dao-Nosql-Redis * -----------------------------------------------------------

Atitit. Report best practices oae and Report Engine selection, atititoae Atitit. Report best practices oae and Report Engine Selection   1. Main functions and structure of reports 2 1.1. query designer (configuration-based, metadata in html), anno 2

MySQL series: thread concurrency synchronization mechanism for innodb Engine analysis, mysqlinnodb Innodb is a multi-thread concurrent storage engine. Internal read/write operations are implemented using multiple threads. Therefore, innodb

Basic Database and basic database tutorial1. The most common data models:(1) Hierarchical Model: uses a tree structure to represent the relationships between entities and entities.In a hierarchical model, only one node has no parent nodes, that is,