Oracle 11G R2 uses RMAN to build the DataGuard Environment

Oracle 11G R2 uses RMAN to build the DataGuard Environment Environment: Role Machine name Operating System IP Remarks Master Database Db1 CentOS 5.11 x86_64 192.168.2.241 Install Oracle and create a database

MySQL Internal-InnoDB Storage engine (row structure)

MySQL Internal-InnoDB Storage engine (row structure) Three parts of InnoDB Row Storage (Description: Number of columns in the F branch table) Name) Size) Field Start Offsets (F * 1) or (F * 2) bytes Extra Bytes 6

MySQL & #183; Performance Optimization & #183; 5.7.6 InnoDB page flush Optimization

MySQL · performance optimization · 5.7.6 InnoDB page flush Optimization In this article, we have introduced in detail the latest Optimization of InnoDB page flush by Oracle MySQL and Community branches. Further improvements have been made in the

Use the Sample parameter of DataPump for data sampling.

Use the Sample parameter of DataPump for data sampling. Data Pump Datapump is a convenient data logical backup and restoration tool launched by Oracle. Compared with the traditional Exp/Imp, Datapump provides many advantages in both performance and

Introduction to deadlocks in SQL Server

Introduction to deadlocks in SQL Server Introduction What is a deadlock? In my opinion, the deadlock is because two objects apply for another resource when they have one resource, and the other resource is exactly what the two objects are holding,

MySQL string truncation Functions

MySQL string truncation Functions In work, some fields may need to form a string by a separator as the field value to access the database table. For example, a task pair should store three results in different data tables, in this case, the primary

Socket programming: byte order

Socket programming: byte order When it comes to socket programming, it will certainly be subject to byte sequence conversion. For a string, there is no difference in the byte order. Just like writing, the memory is like paper, and the string is

Use normal users instead of root to manage IEE

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MySQL & #183; Engine Features & #183; InnoDB redo log roaming

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Use of DRA (Data Recovery Advisor)

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Try Redis: getting started with Redis

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Configure HugePage for Oracle 11gR2 in Linux

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Comparison of iOS databases: SQLite vs. Core Data vs. Realm

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SQL Server database replication

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PostgreSQL avg () function

PostgreSQL avg () function The AVG function of PostgreSQL is used to find the average value of a field in various records. To understand the AVG function, the table COMPANY has the following records:Testdb # select * from COMPANY;Id | name | age |

Solution for deleting the root user of MySQL by mistake in Linux

Solution for deleting the root user of MySQL by mistake in Linux I started to be unfamiliar with the Linux interface. Maybe I accidentally deleted the root user. What should I do? 1. # killall mysqld to kill all mysql Processes 2. # mysqld_safe --

Compile and install MySQL under the same account

Compile and install MySQL under the same account Compile and install MySQL under the same account Check whether the old version exists: Rpm-qa | grep mysql Uninstall the old version: Rpm-e mysql # normal deletion Mode Rpm-e -- nodeps mysql # Strong

MySQL & #183; Performance Optimization & #183; about InnoDB buffer pool flush policies

MySQL-Performance Optimization-about InnoDB buffer pool flush policies Background We know that InnoDB uses the buffer pool to cache data pages read from the disk to the memory. The buffer pool is usually composed of several memory blocks plus a

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