安裝完成后乌妒，按照網(wǎng)上說啟動(dòng)mysql時(shí)卻報(bào)了以下錯(cuò)誤：
[root@localhost bin]# ./mysqld
2015-10-23 16:54:55 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-10-23 16:54:55 0 [Note] ./mysqld (mysqld 5.6.27) starting as process 31176 ...
2015-10-23 16:54:55 31176 [Warning] Can't create test file /data/mysql/localhost.lower-test
2015-10-23 16:54:55 31176 [Warning] Can't create test file /data/mysql/localhost.lower-test
./mysqld: Can't change dir to '/data/mysql/' (Errcode: 2 - No such file or directory)
2015-10-23 16:54:55 31176 [ERROR] Aborting
2015-10-23 16:54:55 31176 [Note] Binlog end
2015-10-23 16:54:55 31176 [Note] ./mysqld: Shutdown complete
網(wǎng)上的解決方法有很多候味，有些我試過不管用垃你，但不能就說這些不管用的文章是亂寫的铺敌，因?yàn)橛行﹩栴}并不是由一個(gè)原因而引起的私杜，不過可以試試遭商，我對(duì)mysql了解不多宪巨，所以也不加以評(píng)論，我是使用以下方法解決的：
首先這個(gè)報(bào)錯(cuò)对竣，很明顯是由于找不到datadir目錄/data/mysql/所引起的庇楞，其實(shí)我安裝mysql時(shí)候是指定了datadir=/usr/mysqldata，于是我在usr創(chuàng)建了mysqldata目錄：
[root@localhost usr]# mkdir -p /usr/mysqldata/
[root@localhost usr]# ls
[root@localhost usr]# chown -R mysql mysqldata
[root@localhost usr]# chgrp -R mysql mysqldata
然后再啟動(dòng)否纬，不過仍然報(bào)錯(cuò)：
[root@localhost bin]# ./mysqld
2015-10-23 17:06:33 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-10-23 17:06:33 0 [Note] ./mysqld (mysqld 5.6.27) starting as process 31312 ...
2015-10-23 17:06:33 31312 [Note] Plugin 'FEDERATED' is disabled.
./mysqld: Table 'mysql.plugin' doesn't exist
2015-10-23 17:06:33 31312 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it.
2015-10-23 17:06:33 31312 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-10-23 17:06:33 31312 [Note] InnoDB: The InnoDB memory heap is disabled
2015-10-23 17:06:33 31312 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-10-23 17:06:33 31312 [Note] InnoDB: Memory barrier is not used
2015-10-23 17:06:33 31312 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-10-23 17:06:33 31312 [Note] InnoDB: Using CPU crc32 instructions
2015-10-23 17:06:33 31312 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-10-23 17:06:33 31312 [Note] InnoDB: Completed initialization of buffer pool
2015-10-23 17:06:33 31312 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!
2015-10-23 17:06:33 31312 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB
2015-10-23 17:06:33 31312 [Note] InnoDB: Database physically writes the file full: wait...
2015-10-23 17:06:33 31312 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB
2015-10-23 17:06:34 31312 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB
2015-10-23 17:06:34 31312 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
2015-10-23 17:06:34 31312 [Warning] InnoDB: New log files created, LSN=45781
2015-10-23 17:06:34 31312 [Note] InnoDB: Doublewrite buffer not found: creating new
2015-10-23 17:06:34 31312 [Note] InnoDB: Doublewrite buffer created
2015-10-23 17:06:34 31312 [Note] InnoDB: 128 rollback segment(s) are active.
2015-10-23 17:06:34 31312 [Warning] InnoDB: Creating foreign key constraint system tables.
2015-10-23 17:06:34 31312 [Note] InnoDB: Foreign key constraint system tables created
2015-10-23 17:06:34 31312 [Note] InnoDB: Creating tablespace and datafile system tables.
2015-10-23 17:06:34 31312 [Note] InnoDB: Tablespace and datafile system tables created.
2015-10-23 17:06:34 31312 [Note] InnoDB: Waiting for purge to start
2015-10-23 17:06:34 31312 [Note] InnoDB: 5.6.27 started; log sequence number 0
2015-10-23 17:06:34 31312 [Warning] No existing UUID has been found, so we assume that this is the first time that this server has been started. Generating a new UUID: 5bed1721-7965-11e5-a520-000c299a432a.
2015-10-23 17:06:34 31312 [Note] Server hostname (bind-address): '*'; port: 3306
2015-10-23 17:06:34 31312 [Note] IPv6 is available.
2015-10-23 17:06:34 31312 [Note] ??- '::' resolves to '::';
2015-10-23 17:06:34 31312 [Note] Server socket created on IP: '::'.
2015-10-23 17:06:34 31312 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.user' doesn't exist
從報(bào)錯(cuò)上來看吕晌，是由于缺少了mysql.plugin表所致的，不過現(xiàn)在連啟動(dòng)都啟動(dòng)不了临燃，怎樣創(chuàng)建表呢睛驳？所以肯定是其他原因?qū)е碌模跁r(shí)繼續(xù)網(wǎng)上找繼續(xù)試膜廊，最后找到了這個(gè)處理方法乏沸，進(jìn)入mysql安裝后的目錄scripts執(zhí)行以下語句：
[root@localhost scripts]# ./mysql_install_db --user=mysql --basedir=/home/mysql5627 --datadir=/usr/mysqldata
Installing MySQL system tables...2015-10-23 17:47:57 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-10-23 17:47:57 0 [Note] /home/mysql5627/bin/mysqld (mysqld 5.6.27) starting as process 31756 ...
2015-10-23 17:47:57 31756 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-10-23 17:47:57 31756 [Note] InnoDB: The InnoDB memory heap is disabled
2015-10-23 17:47:57 31756 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-10-23 17:47:57 31756 [Note] InnoDB: Memory barrier is not used
2015-10-23 17:47:57 31756 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-10-23 17:47:57 31756 [Note] InnoDB: Using CPU crc32 instructions
2015-10-23 17:47:57 31756 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-10-23 17:47:57 31756 [Note] InnoDB: Completed initialization of buffer pool
2015-10-23 17:47:57 31756 [Note] InnoDB: Highest supported file format is Barracuda.
2015-10-23 17:47:57 31756 [Note] InnoDB: Log scan progressed past the checkpoint lsn 49463
2015-10-23 17:47:57 31756 [Note] InnoDB: Database was not shutdown normally!
2015-10-23 17:47:57 31756 [Note] InnoDB: Starting crash recovery.
2015-10-23 17:47:57 31756 [Note] InnoDB: Reading tablespace information from the .ibd files...
2015-10-23 17:47:57 31756 [Note] InnoDB: Restoring possible half-written data pages?
2015-10-23 17:47:57 31756 [Note] InnoDB: from the doublewrite buffer...
InnoDB: Doing recovery: scanned up to log sequence number 1600607
2015-10-23 17:47:57 31756 [Note] InnoDB: Starting an apply batch of log records to the database...
InnoDB: Progress in percent: 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99?
InnoDB: Apply batch completed
2015-10-23 17:47:58 31756 [Note] InnoDB: 128 rollback segment(s) are active.
2015-10-23 17:47:58 31756 [Note] InnoDB: Waiting for purge to start
2015-10-23 17:47:58 31756 [Note] InnoDB: 5.6.27 started; log sequence number 1600607
2015-10-23 17:47:58 31756 [Note] Binlog end
2015-10-23 17:47:58 31756 [Note] InnoDB: FTS optimize thread exiting.
2015-10-23 17:47:58 31756 [Note] InnoDB: Starting shutdown...
2015-10-23 17:48:00 31756 [Note] InnoDB: Shutdown completed; log sequence number 1625987
OK
Filling help tables...2015-10-23 17:48:00 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2015-10-23 17:48:00 0 [Note] /home/mysql5627/bin/mysqld (mysqld 5.6.27) starting as process 31780 ...
2015-10-23 17:48:00 31780 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-10-23 17:48:00 31780 [Note] InnoDB: The InnoDB memory heap is disabled
2015-10-23 17:48:00 31780 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-10-23 17:48:00 31780 [Note] InnoDB: Memory barrier is not used
2015-10-23 17:48:00 31780 [Note] InnoDB: Compressed tables use zlib 1.2.3
2015-10-23 17:48:00 31780 [Note] InnoDB: Using CPU crc32 instructions
2015-10-23 17:48:00 31780 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2015-10-23 17:48:00 31780 [Note] InnoDB: Completed initialization of buffer pool
2015-10-23 17:48:00 31780 [Note] InnoDB: Highest supported file format is Barracuda.
2015-10-23 17:48:00 31780 [Note] InnoDB: 128 rollback segment(s) are active.
2015-10-23 17:48:00 31780 [Note] InnoDB: Waiting for purge to start
2015-10-23 17:48:00 31780 [Note] InnoDB: 5.6.27 started; log sequence number 1625987
2015-10-23 17:48:00 31780 [Note] Binlog end
2015-10-23 17:48:00 31780 [Note] InnoDB: FTS optimize thread exiting.
2015-10-23 17:48:00 31780 [Note] InnoDB: Starting shutdown...
2015-10-23 17:48:01 31780 [Note] InnoDB: Shutdown completed; log sequence number 1625997
OK
To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system
PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:
??/home/mysql5627/bin/mysqladmin -u root password 'new-password'
??/home/mysql5627/bin/mysqladmin -u root -h localhost.localdomain password 'new-password'
Alternatively you can run:
??/home/mysql5627/bin/mysql_secure_installation
which will also give you the option of removing the test
databases and anonymous user created by default. ?This is
strongly recommended for production servers.
See the manual for more instructions.
You can start the MySQL daemon with:
??cd . ; /home/mysql5627/bin/mysqld_safe &
You can test the MySQL daemon with mysql-test-run.pl
??cd mysql-test ; perl mysql-test-run.pl
Please report any problems at http://bugs.mysql.com/
The latest information about MySQL is available on the web at
??http://www.mysql.com
Support MySQL by buying support/licenses at http://shop.mysql.com
WARNING: Found existing config file /home/mysql5627/my.cnf on the system.
Because this file might be in use, it was not replaced,
but was used in bootstrap (unless you used --defaults-file)
and when you later start the server.
The new default config file was created as /home/mysql5627/my-new.cnf,
please compare it with your file and take the changes you need.
WARNING: Default config file /etc/my.cnf exists on the system
This file will be read by default by the MySQL server
If you do not want to use this, either remove it, or use the
--defaults-file argument to mysqld_safe when starting the server
然后再運(yùn)行./mysqld就成功了。
