MySQLStudy案例之--MySQL体系和存储引擎

[root@rh6 ~]#mysqld_safe &

[root@rh6 ~]# ps -ef|grep mysql |grep -v grep
root 4168 4130 0 14:48 pts/1 00:00:00 /bin/sh ./mysqld_safe
mysql 4294 4168 0 14:48 pts/1 00:00:14 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/var/lib/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/var/log/mysqld.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/lib/mysql/mysql.sock
root 4643 4130 0 15:26 pts/1 00:00:00 mysql -h localhost -u root -p

MySQL配置文件：
[root@rh6 ~]# mysql --help |grep my.cnf
 order of preference, my.cnf, $MYSQL_TCP_PORT,
/etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf 

数据文件路径：
mysql> show variables like 'datadir' \G
*************************** 1. row ***************************
Variable_name: datadir
 Value: /var/lib/mysql/
1 row in set (0.00 sec)

[root@rh6 bin]# ls -l /var/lib/mysql/
total 28688
-rw-rw---- 1 mysql mysql 56 Jan 28 17:25 auto.cnf
-rw-rw---- 1 mysql mysql 18874368 Feb 2 14:48 ibdata1
-rw-rw---- 1 mysql mysql 5242880 Feb 2 14:48 ib_logfile0
-rw-rw---- 1 mysql mysql 5242880 Jan 28 17:21 ib_logfile1
drwx------ 2 mysql root 4096 Jan 28 17:21 mysql
srwxrwxrwx 1 mysql mysql 0 Feb 2 14:48 mysql.sock
drwx------ 2 mysql mysql 4096 Jan 28 17:21 performance_schema
drwx------ 2 mysql root 4096 Jan 28 17:21 test

mysql> show engine innodb status \G
*************************** 1. row ***************************
 Type: InnoDB
 Name: 
Status: 
=====================================
150202 17:15:33 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 19 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 0 srv_active, 0 srv_shutdown, 8787 srv_idle
srv_master_thread log flush and writes: 8787
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 3
OS WAIT ARRAY INFO: signal count 3
Mutex spin waits 2, rounds 60, OS waits 1
RW-shared spins 2, rounds 60, OS waits 2
RW-excl spins 0, rounds 0, OS waits 0
Spin rounds per wait: 30.00 mutex, 30.00 RW-shared, 0.00 RW-excl
------------
TRANSACTIONS
------------
Trx id counter 2305
Purge done for trx's n:o < 0 undo n:o < 0
History list length 0
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 3, OS thread handle 0x7fe2a80c2700, query id 45 localhost root init
show engine innodb status
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,
 ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
161 OS file reads, 5 OS file writes, 5 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
 insert 0, delete mark 0, delete 0
discarded operations:
 insert 0, delete mark 0, delete 0
Hash table size 276707, node heap has 0 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 1602871
Log flushed up to 1602871
Pages flushed up to 1602871
Last checkpoint at 1602871
0 pending log writes, 0 pending chkp writes
8 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 43148
Buffer pool size 8192
Free buffers 8042
Database pages 150
Old database pages 0
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0 single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 150, created 0, written 1
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 150, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Main thread process no. 4294, id 140611110070016, state: sleeping
Number of rows inserted 0, updated 0, deleted 0, read 0
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
1 row in set (0.00 sec)