空闲的数据缓冲区比例

空闲的记录数除以X$BH表中的记录总数（即所分配的数据块缓冲区的总数）得到的空闲缓冲区百分比。同样注意，拥有众多空闲缓冲区的数据库不一定是最佳环境，因为可能是缓冲区设置过大，浪费内存。51Testing软件测试网RCM]/rQ5m/X:Z

检查方法：51Testing软件测试网*r2AAM2xM%N'v
V`g

selectdecode(state,51Testing软件测试网t f0s.a$D
              0,51Testing软件测试网KhK~(C2D5Q1i)e j
              'FREE',
6X Q e(j#iuK0              1,51Testing软件测试网7S{YYbH?
              decode(lrba_seq, 0, 'AVAILABLE', 'BEING USED'),
KiX4U9^:Y0              3,
&C
Y2_,Y}s8} Zk0              'BEING USED',
I"ZV~+vH,dv0              state) "Block Status",
%o!~~2?,Q0      count(*)51Testing软件测试网7H+M,mLnLM8L1m;y
 fromx$bh
jKDC#BQ9@0 groupbydecode(state,
DN%u1X[*Q IJZ0                 0,51Testing软件测试网(sc j!\T(|1a({
                 'FREE',
$G{TU9QE7|0O0                 1,51Testing软件测试网%Z#f_H4?
                 decode(lrba_seq, 0, 'AVAILABLE', 'BEING USED'),51Testing软件测试网"q8h`'~+L?1[}~v7\u
                 3,51Testing软件测试网g ?6Vm`
                 'BEING USED',51Testing软件测试网FV U/\%cP h
                 state);

 51Testing软件测试网_&p4pK*n\cs[:@1v

评估准则：51Testing软件测试网*Xj7s-y2d