原题

Choose four.

A newly deployed replication master database has a 10/90 read to write ratio.

The complete dataset is currently 28G but will never fluctuate beyond +-10%.

The database storage system consists of two locally attached PCI- E Enterprise grade disks

(mounted as /data1 and /data2)

The server is dedicated to this MySQL Instance.

System memory capacity is 64G.

The my.cnf file contents are displayed here:

[mysqld]

datadir=/data1/

innodb_buffer_pool_size=28G

innodb_log_file_size=150M

Which four changes provide the most performance improvement, without sacrificing data

integrity?

A) innodb-doublewrite=off

B) innodb_log_group_home_dir=/data2/

C) innodb_log_file_size=1G

D) innodb_undo_directory=/dev/shm

E) log-bin=/data2/

F) innodb_flush_log_at_trx_commit=0

G) sync_binlog=0

H) innodb_buffer_pool_size=32G

I) disable-log-bin

解析

Answer: B C E H

分析：不牺牲数据完整性的情况下提供了最大的性能改进