缓冲池数据物理读数(以表空间页宽为单位定义)。
Buffer pool data physical reads (defined in units of tablespace page size).
从Informix SYSCHUNKS系统表中读数据，并根据以下标准包括镜像块。
Read data from the Informix SYSCHUNKS system table and include mirror chunks according to this criteria.
RS485远程售电加密方案，主机发读数据命令，读取表内当前剩余电量。
RS485 remote sale of electricity encryption scheme, the host read data command issued, the current remaining capacity to read the table.
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