【单实例安装】
说明:即只提供一个服务,一个端口
sed -i 2s/localhost.localdomain/mysql/ /etc/sysconfig/network
hostname mysql
yum -y install ncurses-devel gcc gcc-c++
useradd mysql -s /sbin/nologin -M
tar xf cmake-2.8.8.tar.gz
cd cmake-2.8.8
./configure
gmake
gmake install
cd ..
tar xf mysql-5.5.32.tar.gz
cd mysql-5.5.32
cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql \
-DMYSQL_DATADIR=/usr/local/mysql/data \
-DMYSQL_UNIX_ADDR=/usr/local/mysql/tmp/mysql.sock \
-DDEFAULT_CHARSET=utf8 \
-DDEFAULT_COLLATION=utf8_general_ci \
-DEXTRA_CHARSETS=gbk,gb2312,utf8,ascii \
-DENABLED_LOCAL_INFILE=ON \
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
-DWITH_FEDERATED_STORAGE_ENGINE=1 \
-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \
-DWITHOUT_EXAMPLE_STORAGE_ENGINE=1 \
-DWITHOUT_PARTITION_STORAGE_ENGINE=1 \
-DWITH_ZLIB=bundled \
-DENABLED_LOCAL_INFILE=1 \
-DWITH_READLINE=1 \
-DWITH_EMBEDDED_SERVER=1 \
-DWITH-DEBUG=0
make && make install
cp support-files/my-small.cnf /etc/my.cnf
ln -s /usr/local/mysql/bin/* /usr/local/sbin
chmod -R 1777 /tmp
chown -R mysql:mysql /usr/local/mysql
cd /usr/local/mysql/scripts/
./mysql_install_db --basedir=/usr/local/mysql/ --datadir=/usr/local/mysql/data/ --user=mysql
cp /opt/mysql-5.5.32/support-files/mysql.server /etc/init.d/mysqld
chmod +x /etc/init.d/mysqld
service mysqld start
chkconfig mysqld on
mysql -e "delete from mysql.user where user='';"
mysql -e "delete from mysql.user where host='localhost.localdomain';"
mysql -e "delete from mysql.user where host='::1';"
mysql -e "drop database test;"
mysqladmin -u root password "wsyht123"
【多实例安装】
说明:多实例,指多个端口,多个MySQL提供服务
sed -i 2s/localhost.localdomain/mysql/ /etc/sysconfig/network
hostname mysql
yum -y install ncurses-devel gcc gcc-c++ libaio-devel
useradd mysql -s /sbin/nologin -M
tar xf cmake-2.8.8.tar.gz
cd cmake-2.8.8
./configure
gmake
gmake install
cd ..
tar xf mysql-5.5.32.tar.gz
cd mysql-5.5.32
cmake . -DCMAKE_INSTALL_PREFIX=/usr/local/mysql \
-DMYSQL_DATADIR=/usr/local/mysql/data \
-DMYSQL_UNIX_ADDR=/usr/local/mysql/tmp/mysql.sock \
-DDEFAULT_CHARSET=utf8 \
-DDEFAULT_COLLATION=utf8_general_ci \
-DEXTRA_CHARSETS=gbk,gb2312,utf8,ascii \
-DENABLED_LOCAL_INFILE=ON \
-DWITH_INNOBASE_STORAGE_ENGINE=1 \
-DWITH_FEDERATED_STORAGE_ENGINE=1 \
-DWITH_BLACKHOLE_STORAGE_ENGINE=1 \
-DWITHOUT_EXAMPLE_STORAGE_ENGINE=1 \
-DWITHOUT_PARTITION_STORAGE_ENGINE=1 \
-DWITH_ZLIB=bundled \
-DENABLED_LOCAL_INFILE=1 \
-DWITH_READLINE=1 \
-DWITH_EMBEDDED_SERVER=1 \
-DWITH-DEBUG=0
make && make install
ln -s /usr/local/mysql/bin/* /usr/local/sbin
chmod 700 /opt/mysql
mkdir -p /data/{3306,3307,3308}
cp /opt/my.cnf /data/3306/
cp /opt/my.cnf /data/3307/
cp /opt/my.cnf /data/3308/
cp /opt/mysql /data/3306
cp /opt/mysql /data/3307
cp /opt/mysql /data/3308
chmod -R 1777 /tmp
chown -R mysql:mysql /data
chown -R mysql:mysql /usr/local/mysql
cd /usr/local/mysql/scripts
./mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/3306/data/ --user=mysql
./mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/3307/data/ --user=mysql
./mysql_install_db --basedir=/usr/local/mysql/ --datadir=/data/3308/data/ --user=mysql
/data/3306/mysql start

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MySQLstringtypesincludeVARCHAR,TEXT,CHAR,ENUM,andSET.1)VARCHARisversatileforvariable-lengthstringsuptoaspecifiedlimit.2)TEXTisidealforlargetextstoragewithoutadefinedlength.3)CHARisfixed-length,suitableforconsistentdatalikecodes.4)ENUMenforcesdatainte

MySQLoffersvariousstringdatatypes:1)CHARforfixed-lengthstrings,2)VARCHARforvariable-lengthtext,3)BINARYandVARBINARYforbinarydata,4)BLOBandTEXTforlargedata,and5)ENUMandSETforcontrolledinput.Eachtypehasspecificusesandperformancecharacteristics,sochoose

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ToaddusersinMySQLeffectivelyandsecurely,followthesesteps:1)UsetheCREATEUSERstatementtoaddanewuser,specifyingthehostandastrongpassword.2)GrantnecessaryprivilegesusingtheGRANTstatement,adheringtotheprincipleofleastprivilege.3)Implementsecuritymeasuresl

ToaddanewuserwithcomplexpermissionsinMySQL,followthesesteps:1)CreatetheuserwithCREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password';.2)Grantreadaccesstoalltablesin'mydatabase'withGRANTSELECTONmydatabase.TO'newuser'@'localhost';.3)Grantwriteaccessto'

The string data types in MySQL include CHAR, VARCHAR, BINARY, VARBINARY, BLOB, and TEXT. The collations determine the comparison and sorting of strings. 1.CHAR is suitable for fixed-length strings, VARCHAR is suitable for variable-length strings. 2.BINARY and VARBINARY are used for binary data, and BLOB and TEXT are used for large object data. 3. Sorting rules such as utf8mb4_unicode_ci ignores upper and lower case and is suitable for user names; utf8mb4_bin is case sensitive and is suitable for fields that require precise comparison.

The best MySQLVARCHAR column length selection should be based on data analysis, consider future growth, evaluate performance impacts, and character set requirements. 1) Analyze the data to determine typical lengths; 2) Reserve future expansion space; 3) Pay attention to the impact of large lengths on performance; 4) Consider the impact of character sets on storage. Through these steps, the efficiency and scalability of the database can be optimized.


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