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mysql innodb

2024-07-30 01:47:50   221人阅读

 

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)

 

mysql innodb


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