Principle test of MySQL InnoDB Engine lock

Principle test of MySQL InnoDB Engine lock How does MySQL INNODB Engine lock work? Let's test it. Mysql> select version (); + ----------- +| VERSION () |+ ----------- +| 5.5.20 |+ ----------- +1 row in set (0.00 sec) Create table test(A INT (5 ),B

How to downgrade an Oracle database from 11.2 to a previous version

How to downgrade an Oracle database from 11.2 to a previous version This document can be used to downgrade the upgraded database from Oracle 11gR2 to the following guidelines and checklists: Oracle 10gR1, Oracle 10gR2, and Oracle 11gR1. This

Precautions for copying an Oracle database

Precautions for copying an Oracle database The number of files in the production database copied this time is 9.18 TB, the actual size of the allocated data is 5.16 TB, and the size of the data after compression and backup using RMAN is 1.1 TB. The

Archive mode: Restores data files that are not backed up.

Archive mode: Restores data files that are not backed up. Scenario: 1. Open archiving for databases; 2. All archived logs after data files are created are online; 3. Data Files Or tablespaces have not been backed up, databases have not been backed

Use RMAN to migrate the file system to ASM

Use RMAN to migrate the file system to ASM 1. Full backup database PROD Run {Allocate channel c1 device type disk;Allocate channel c2 device type disk;Backup tag 'sh _ db' as compressed backupset format'/home/Oracle/full _ % U. Bak' databaseInclude

Considerations for installing MySQL source code scr. rpm

Considerations for installing MySQL source code scr. rpm The rpm installation package is usually a Binary package or a Source package. When using the source code to install MySQL, the source code package downloaded on the official website is usually

Oracle bug solved: ORA-20446 Error

Oracle bug solved: ORA-20446 Error I downloaded an Oracle 11g and want to see what new features are available. After the installation, enable EM and find that the feature is excellent. It is used to import data from another database. Set to import

Configure Oracle ASMLib and disk multi-path on Linux

Configure Oracle ASMLib and disk multi-path on Linux Configure Oracle ASMLIB and multi-path Disks The following documents describe how to use Oracle asmlib to access a multi-path disk on the linux platform, no matter which multi-path software you

How can I avoid resetlogs from opening the database after the control file is restored?

How can I avoid resetlogs from opening the database after the control file is restored? After the control file is restored, the database is opened using resetlogs, and the sequence of online logs is reset. SYS @ practice> select group #, sequence #,

Oracle ORA-27121 troubleshooting

Oracle ORA-27121 troubleshooting ORA-27121: unable to determine size of shared memory segmentCause: shmctl () call failedAction: check permissions on segment, contact Oracle support Cause: The oracle database is migrated through the cold copy

Migrate Oracle databases across OS platforms

Migrate Oracle databases across OS platforms Port existing Oracle databases (non-binary executable program files/) from one operating system platform to another operating system platform (for example, from Windows to Solaris)This requirement may

Use RMAN to copy RAC + ASM to a single instance + ASM

Use RMAN to copy RAC + ASM to a single instance + ASM This test copies the dual-node RAC deployed on ASM to the ASM of a single instance. This test is also based on the needs of a project. The drill operations on the virtual machine are hereby

Oracle TRUNC () function usage, oracletrunc

Oracle TRUNC () function usage, oracletrunc TRUNC () function usage in Oracle 1. Processing date TRUNC (date [, fmt]): truncates a date based on the fmt Format. Select trunc (SYSDATE, 'D') from dual; -- select trunc (SYSDATE, 'mm') from dual on the

High-performance MySql (Third edition) and MySql video tutorial-Baidu cloud download path, mysql video tutorial

High-performance MySql (Third edition) and MySql video tutorial-Baidu cloud download path, mysql video tutorial Baidu cloud shares the MySql video tutorial with you and wishes your career progress! High Performance MySql (Third edition):

Analysis of Three-tier architecture, analysis of three-tier architecture

Analysis of Three-tier architecture, analysis of three-tier architectureThree-tier architectureLet's take a preliminary look at the three-tier architecture through several questions.1. What is a three-tier architecture?2. Application Scenario-why

Real-Time SQL Monitoring using DBMS_SQLTUNE, dbmssqltune

Real-Time SQL Monitoring using DBMS_SQLTUNE, dbmssqltune Real-Time SQL Monitoring reports are available from three locations: Enterprise Manager-Click the "Performance" tab, then the "SQL Monitoring" link at the bottom-right of the page to display

Oracle creates users and backs up and restores databases.

Oracle creates users and backs up and restores databases. -- Create the user create user XX identified by "" default tablespace USERS temporary tablespace TEMP profile DEFAULT password expire; -- Grant/Revoke role privileges grant connect to XX ;

SQLite creates a table and adds data. sqlite creates data.

SQLite creates a table and adds data. sqlite creates data. -(Void) viewDidLoad {[super viewDidLoad]; // create a table [self creatTable]; // insert data [self insertTable];} // --------------------- create a table ------------------- (void)

MySql database uses SQL statements to set encoding, mysql Database SQL statements

MySql database uses SQL statements to set encoding, mysql Database SQL statements-- View All character codes Show character set; -- View the commands for creating a database and the encoding used by the databaseShow create database dbtest; -- View

Understand the internal structure of B * tree index and the internal structure of tree

Understand the internal structure of B * tree index and the internal structure of tree Reprinted please indicate the source: http://write.blog.csdn.net/postedit/40589651 The B-tree index in the Oracle database is like an inverted-long tree, which

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