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安装MySQL时，有warning:
[root@localhost mysql]# scripts/mysql_install_db --user=mysql Installing MySQL system tables...2015-08-13 14:20:09 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2015-08-13 14:20:09 0 [Note] ./bin/mysqld (mysqld 5.6.26) starting as process 1934 ... 2015-08-13 14:20:09 1934 [Note] InnoDB: Using mutexes to ref count buffer pool pages 2015-08-13 14:20:09 1934 [Note] InnoDB: The InnoDB memory heap is disabled 2015-08-13 14:20:09 1934 [Note] InnoDB: Mutexes and rw_locks use InnoDB"s own implementation 2015-08-13 14:20:09 1934 [Note] InnoDB: Memory barrier is not used 2015-08-13 14:20:09 1934 [Note] InnoDB: Compressed tables use zlib 1.2.3 2015-08-13 14:20:09 1934 [Note] InnoDB: Using Linux native AIO 2015-08-13 14:20:09 1934 [Note] InnoDB: Not using CPU crc32 instructions 2015-08-13 14:20:09 1934 [Note] InnoDB: Initializing buffer pool, size = 128.0M 2015-08-13 14:20:09 1934 [Note] InnoDB: Completed initialization of buffer pool 2015-08-13 14:20:10 1934 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created! 2015-08-13 14:20:10 1934 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB 2015-08-13 14:20:10 1934 [Note] InnoDB: Database physically writes the file full: wait... 2015-08-13 14:20:10 1934 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB 2015-08-13 14:20:11 1934 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB 2015-08-13 14:20:12 1934 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0 2015-08-13 14:20:12 1934 [Warning] InnoDB: New log files created, LSN=45781 2015-08-13 14:20:12 1934 [Note] InnoDB: Doublewrite buffer not found: creating new 2015-08-13 14:20:12 1934 [Note] InnoDB: Doublewrite buffer created 2015-08-13 14:20:12 1934 [Note] InnoDB: 128 rollback segment(s) are active. 2015-08-13 14:20:12 1934 [Warning] InnoDB: Creating foreign key constraint system tables. 2015-08-13 14:20:12 1934 [Note] InnoDB: Foreign key constraint system tables created 2015-08-13 14:20:12 1934 [Note] InnoDB: Creating tablespace and datafile system tables. 2015-08-13 14:20:12 1934 [Note] InnoDB: Tablespace and datafile system tables created. 2015-08-13 14:20:12 1934 [Note] InnoDB: Waiting for purge to start 2015-08-13 14:20:12 1934 [Note] InnoDB: 5.6.26 started; log sequence number 0 2015-08-13 14:20:14 1934 [Note] Binlog end 2015-08-13 14:20:14 1934 [Note] InnoDB: FTS optimize thread exiting. 2015-08-13 14:20:14 1934 [Note] InnoDB: Starting shutdown... 2015-08-13 14:20:16 1934 [Note] InnoDB: Shutdown completed; log sequence number 1625977 [root@l
