DBA需要安裝MySQL數據庫，安裝過程如下：

1. 下載MySQL軟件。訪問MySQL官網，找到合適的版本并下載安裝包。

2. 安裝MySQL軟件。使用管理員權限打開安裝包并按照提示進行安裝。

3. 配置MySQL。在MySQL安裝目錄下，找到my.ini（Windows）或者my.cnf（Unix）文件。通過修改配置文件設置MySQL的參數，如端口號、緩存大小等。

# Example MySQL config file for medium systems.
#
# This is for a large system with memory = 512M where the system runs mainly
# MySQL.
#
# MySQL programs look for option files in a set of file locations which depend
# on the deployment platform.
# You can copy this option file to one of those, and then rename it to
# 'my.cnf' if you like.
#
# More detailed information about the individual options can be found in the
# manual.
#
[client]
port            = 3306
socket          = /tmp/mysql.sock
[mysqld]
port            = 3306
socket          = /tmp/mysql.sock
skip-locking
set-variable    = key_buffer=16M
set-variable    = max_allowed_packet=1M
set-variable    = table_cache=64
set-variable    = sort_buffer=512K
set-variable    = net_buffer_length=8K
set-variable    = myisam_sort_buffer_size=8M
# Don't allow more than 300 connections:
set-variable    = max_connections=300
# Extra logging:
log             = /var/log/mysql/mysql.log
log-error       = /var/log/mysql/mysql.err
[mysqldump]
quick
set-variable    = max_allowed_packet=16M
[mysql]
no-auto-rehash
[isamchk]
set-variable    = key_buffer=256M
set-variable    = sort_buffer=256M
set-variable    = read_buffer=2M
set-variable    = write_buffer=2M
[myisamchk]
set-variable    = key_buffer=256M
set-variable    = sort_buffer=256M
set-variable    = read_buffer=2M
set-variable    = write_buffer=2M
[mysqlhotcopy]
interactive-timeout

4. 啟動MySQL。在命令行窗口輸入啟動命令并回車，如下所示：

# Windows
C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld
# Unix
sudo /usr/local/mysql/support-files/mysql.server start

至此，MySQL數據庫就已經成功安裝并啟動。DBA可以通過客戶端工具或者命令行窗口管理MySQL數據庫，如創建用戶、授權、備份等操作。