2016年11月17日
a bitwise operation 广告投放监控
摘要： 将随着时间不断增大的数字N个依次编号为1到N的N个球，颜色每次随机为红黑蓝，时间上先后逐个放入篮子中，计算离现在最近的24个球的红、黑、蓝颜色数 广告投放监控 a bitwise operation http://redis.io/commands/bitop http://blog.getspoo 阅读全文
posted @ 2016-11-17 19:58 papering 阅读(329) 评论(0) 推荐(0)
the basic index concept
摘要： Computer Science An Overview _J. Glenn Brookshear _11th Edition Over the years numerous variations of the basic index concept have been used.One varia 阅读全文
posted @ 2016-11-17 13:27 papering 阅读(170) 评论(0) 推荐(0)
sentinel
摘要： Computer Science An Overview _J. Glenn Brookshear _11th Edition Inherent in processing a sequential file is the need to detect when the end ofthe file 阅读全文
posted @ 2016-11-17 13:26 papering 阅读(162) 评论(0) 推荐(0)
Locking
摘要： Computer Science An Overview _J. Glenn Brookshear _11th Edition To solve such problems, a DBMS could force transactions to execute intheir entirety on 阅读全文
posted @ 2016-11-17 13:15 papering 阅读(244) 评论(0) 推荐(0)
cascading rollback 级联回滚
摘要： Computer Science An Overview _J. Glenn Brookshear _11th Edition To emphasize the delicate nature of DBMS design, we should note that thereare subtle p 阅读全文
posted @ 2016-11-17 12:53 papering 阅读(445) 评论(0) 推荐(0)
by maintaining a log containing a record of each transaction’s activities - The Commit/Rollback Protocol
摘要： Computer Science An Overview _J. Glenn Brookshear _11th Edition Before a transaction is allowed to alter the database, the alteration to be per-formed 阅读全文
posted @ 2016-11-17 12:50 papering 阅读(172) 评论(0) 推荐(0)