Bad Block Scan 损毁区块扫描
When DB2 performs an index or table scan, DB2 will block on a row lock when it comes across an uncommitted row which another transaction has exclusively (X) locked.
DB2 在执行索引或表扫描时，如果遇到一个被另一个事务独占 (X) 锁定的未提交行，那么 DB2 将阻塞在行锁上。
When scanning an MDC table, block locking could be deferred for an index scan.
当扫描一个mdc表时，对于索引扫描，块锁可以推迟。
These services scan for Web sites exhibiting unusual behavior or known malicious activity and block those sites from users.
它可以对网站进行扫描，监测其是否有不正常的行为或是否存在已知的恶意行为，并阻挡用户访问这些站点。
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