标签：style blog io color ar sp 文件 div on
InnoDB tablespace and logs
配置默认每个表拥有自己的表空间;
innodb_file_per_table=1
对于以前的表示不受影响的, 只对新表有效;
tablespace 可以自动增长,大小受到文件系统的限制,还可以放到裸设备里面, 大小不再不受文件系统限制
"裸设备的extent"
1;配置表空间;
innodb_data_file_path ibdata1:10M:autoextend
如要要配置绝对路径,需要把Innodb_data_home_dir 置空
Innodb_data_home_dir =
innodb_data_file_path = /tmp/ibdata1:10M:autoextend[:max20M]; /tmp/ibdata1:10M:autoextend[:max20M]
注意:
ACID:
T
首先看看默认是否打开:
mysql> show variables like ‘autocommit‘; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | autocommit | ON | +---------------+-------+ 1 row in set (0.00 sec)
测试1:
第一个窗口
set autocommit = 0 ; insert into t1 values (1,2); commit;
mysql> start transaction; Query OK, 0 rows affected (0.00 sec) mysql> insert into t1 values(111,111); Query OK, 1 row affected (0.00 sec) mysql> rollback; Query OK, 0 rows affected (0.04 sec)
InnoDB buffers
innodb_buffer_pool_size =134217728
innodb_additional_mem_pool_size=8388608
innodb_max_dirty_pages_pct =75
mysql> show variables like ‘%innodb_buffer%‘; +-------------------------------------+----------------+ | Variable_name | Value | +-------------------------------------+----------------+ | innodb_buffer_pool_dump_at_shutdown | OFF | | innodb_buffer_pool_dump_now | OFF | | innodb_buffer_pool_filename | ib_buffer_pool | | innodb_buffer_pool_instances | 8 | | innodb_buffer_pool_load_abort | OFF | | innodb_buffer_pool_load_at_startup | OFF | | innodb_buffer_pool_load_now | OFF | | innodb_buffer_pool_size | 134217728 | +-------------------------------------+----------------+ 8 rows in set (0.00 sec)
mysql> show variables like ‘%have%‘; +----------------------+----------+ | Variable_name | Value | +----------------------+----------+ | have_compress | YES | | have_crypt | NO | | have_csv | YES | | have_dynamic_loading | YES | | have_geometry | YES | | have_innodb | YES | | have_ndbcluster | NO | | have_openssl | DISABLED | | have_partitioning | YES | | have_profiling | YES | | have_query_cache | YES | | have_rtree_keys | YES | | have_ssl | DISABLED | | have_symlink | YES | +----------------------+----------+ 14 rows in set (0.43 sec)
标签：style blog io color ar sp 文件 div on
原文地址：http://www.cnblogs.com/mjorcen/p/4060243.html
