题目内容

Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data. This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead. What three changes will reduce disk I/O overheads?（）

A. Use of soft links for database directories on the same physical disk
B. Use of delay_key_write=ON for batch index update
C. Allocation of RAM to the buffer pool such that more of the data can fit in RAM
D. Placement of InnoDB log files and datadir on separate physical disks
E. Use of separate directories on the same physical disk for log files and data file

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A. 当θ/ω＞1时，y（t）与P（t）同向，当θ/ω＜1时，y（t）与P（t）反向
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