MySQL Tutorials - Herong's Tutorial Examples

∟Installing MySQL Server on Linux

∟MySQL Server File Locations on CentOS

This section provides a tutorial example on how to find and view MySQL Server file locations for MySQL 8.0 server on CentOS 8 systems.

In order to properly maintain MySQL server, you need to know how and where MySQL server stores its files. As an example, here are the locations of MySQL server files on my CentOS 8 computer:

1. MySQL command program files are stored in 2 directories: 

herong$ ls -l /usr/sbin grep mysql
lrwxrwxrwx. 1 root root        19 Oct  8 09:34 mysqld -> /usr/libexec/mysqld

herong$ ls -l /usr/bin grep mysql
-rwxr-xr-x. 1 root root     7703224 Oct  8 09:37 mysql
-rwxr-xr-x. 1 root root     7474568 Oct  8 09:37 mysqladmin
-rwxr-xr-x. 1 root root     8198496 Oct  8 09:37 mysqlbinlog
-rwxr-xr-x. 1 root root     7495776 Oct  8 09:37 mysqlcheck
-rwxr-xr-x. 1 root root      674528 Oct  8 09:37 mysql_config_editor
-rwxr-xr-x. 1 root root        4392 Oct  8 09:24 mysqld_pre_systemd
-rwxr-xr-x. 1 root root     7587512 Oct  8 09:37 mysqldump
-rwxr-xr-x. 1 root root        7690 Oct  8 09:24 mysqldumpslow
-rwxr-xr-x. 1 root root     7473216 Oct  8 09:37 mysqlimport
-rwxr-xr-x. 1 root root     8380208 Oct  8 09:37 mysqlpump
-rwxr-xr-x. 1 root root     7458664 Oct  8 09:37 mysql_secure_installation
-rwxr-xr-x. 1 root root     7467968 Oct  8 09:37 mysqlshow
-rwxr-xr-x. 1 root root     7497168 Oct  8 09:37 mysqlslap
-rwxr-xr-x. 1 root root      733424 Oct  8 09:37 mysql_ssl_rsa_setup
-rwxr-xr-x. 1 root root      541152 Oct  8 09:37 mysql_tzinfo_to_sql
-rwxr-xr-x. 1 root root     7656336 Oct  8 09:37 mysql_upgrade

2. MySQL server data and log files are located at /var/lib/mysql. Each database is stored a separate sub-directory: 

herong$ ls -l /var/lib/mysql
total 188988
-rw-r-----. 1 mysql mysql       56 Mar 26 22:02  auto.cnf
-rw-r-----. 1 mysql mysql 18315580 Mar 27 05:49  binlog.000001
-rw-r-----. 1 mysql mysql      178 Mar 27 06:13  binlog.000002
-rw-r-----. 1 mysql mysql     9995 Mar 28 08:14  binlog.000003
-rw-r-----. 1 mysql mysql     2785 Mar 28 08:33  binlog.000004
-rw-r-----. 1 mysql mysql       64 Mar 28 08:15  binlog.index
-rw-------. 1 mysql mysql     1680 Mar 26 22:02  ca-key.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  ca.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  client-cert.pem
-rw-------. 1 mysql mysql     1676 Mar 26 22:02  client-key.pem
-rw-r-----. 1 mysql mysql     4188 Mar 28 08:14  ib_buffer_pool
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:34  ibdata1
-rw-r-----. 1 mysql mysql 50331648 Mar 28 08:34  ib_logfile0
-rw-r-----. 1 mysql mysql 50331648 Mar 26 22:01  ib_logfile1
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:15  ibtmp1
drwxr-x---. 2 mysql mysql      187 Mar 28 08:15 '#innodb_temp'
drwxr-x---. 2 mysql mysql      143 Mar 26 22:02  mysql
-rw-r-----. 1 mysql mysql 24117248 Mar 28 08:33  mysql.ibd
srwxrwxrwx. 1 mysql mysql        0 Mar 28 08:15  mysql.sock
-rw-------. 1 mysql mysql        5 Mar 28 08:15  mysql.sock.lock
-rw-r--r--. 1 mysql mysql        7 Mar 26 22:02  mysql_upgrade_info
srwxrwxrwx. 1 mysql mysql        0 Mar 28 08:15  mysqlx.sock
-rw-------. 1 mysql mysql        6 Mar 28 08:15  mysqlx.sock.lock
drwxr-x---. 2 mysql mysql     8192 Mar 26 22:02  performance_schema
-rw-------. 1 mysql mysql     1676 Mar 26 22:02  private_key.pem
-rw-r--r--. 1 mysql mysql      452 Mar 26 22:02  public_key.pem
-rw-r--r--. 1 mysql mysql     1112 Mar 26 22:02  server-cert.pem
-rw-------. 1 mysql mysql     1680 Mar 26 22:02  server-key.pem
drwxr-x---. 2 mysql mysql       28 Mar 26 22:02  sys
drwxr-x---. 2 mysql mysql      181 Mar 27 02:00  test
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:33  undo_001
-rw-r-----. 1 mysql mysql 12582912 Mar 28 08:32  undo_002

Table of Contents

 About This Book

 Introduction of SQL

 MySQL Introduction and Installation

 Introduction of MySQL Programs

 PHP Programs and MySQL Server

 Perl Programs and MySQL Servers

 Java Programs and MySQL Servers

 Datatypes and Data Literals

 Operations and Expressions

 Character Strings and Bit Strings

 Commonly Used Functions

 Table Column Types for Different Types of Values

 Using DDL to Create Tables and Indexes

 Using DML to Insert, Update and Delete Records

 Using SELECT to Query Database

 Window Functions for Statistical Analysis

 Use Index for Better Performance

 Transaction Management and Isolation Levels

 Locks Used in MySQL

 Defining and Calling Stored Procedures

 Variables, Loops and Cursors Used in Stored Procedures

 System, User-Defined and Stored Procedure Variables

 MySQL Server Administration

 Storage Engines in MySQL Server

 InnoDB Storage Engine - Primary and Secondary Indexes

 Performance Tuning and Optimization

 Bulk Changes on Large Tables

 MySQL Server on macOS

►Installing MySQL Server on Linux

 Install MySQL Database Server on CentOS

 Manage MySQL Server 'mysqld' on CentOS

 Set MySQL Server "root" Password on CentOS

►MySQL Server File Locations on CentOS

 MySQL Server Data Backups on CentOS

 MySQL Server Log Files on CentOS

 "Multiple files found for the same tablespace ID" Error

 Connection, Performance and Second Instance on Linux

 Archived Tutorials

 References

 Full Version in PDF/EPUB