"Cache Data" BC user property

Hi Siebel Experts,

Can you explain how 'Cache Data' BC user property  works?. I have one custom BC based on custom table, data is static. I have set user property 'Cache Data' to True. Here are my questions:

1. How data from table is Cached, when the server starts , data from this table is cached in memory or cached when the query is issued against this table ?.

2. I have step in workflow which query this BC example Trans No, based on this Trans No, i fetch other fields and store it in process property in WF. First I query Trans No: 'TRAN-01' does it query db and get other fields or get field values from memory?.