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A fixed pivotal retractable roller mechanism 20 and method for statically supporting an item 46 upon a support surface 44 in an inoperative state and supporting the item 46 to roll along the support surface 44 in an operative state. The mechanism 20 includes a housing 22, a swingarm 26 pivotally eng

A fixed pivotal retractable roller mechanism 20 and method for statically supporting an item 46 upon a support surface 44 in an inoperative state and supporting the item 46 to roll along the support surface 44 in an operative state. The mechanism 20 includes a housing 22, a swingarm 26 pivotally engaged with the housing 22, a spring 36, and a roller 32. The swingarm 26 has pivotal movement relative to the housing 22, the swingarm 26 has an inoperative position state where the roller 32 is retracted allowing the housing 22 to rest on and statically contact the support surface 44 and an operative position state where the swingarm 26 is extended such that the housing 22 is not in contact with the support surface 44 allowing the item 46 to roll along the support surface 44. Other embodiments with castor and without a spring are also disclosed.

대표청구항 ▼

A fixed pivotal retractable roller mechanism 20 and method for statically supporting an item 46 upon a support surface 44 in an inoperative state and supporting the item 46 to roll along the support surface 44 in an operative state. The mechanism 20 includes a housing 22, a swingarm 26 pivotally eng

A fixed pivotal retractable roller mechanism 20 and method for statically supporting an item 46 upon a support surface 44 in an inoperative state and supporting the item 46 to roll along the support surface 44 in an operative state. The mechanism 20 includes a housing 22, a swingarm 26 pivotally engaged with the housing 22, a spring 36, and a roller 32. The swingarm 26 has pivotal movement relative to the housing 22, the swingarm 26 has an inoperative position state where the roller 32 is retracted allowing the housing 22 to rest on and statically contact the support surface 44 and an operative position state where the swingarm 26 is extended such that the housing 22 is not in contact with the support surface 44 allowing the item 46 to roll along the support surface 44. Other embodiments with castor and without a spring are also disclosed. xt data is not stored in the cache memory, making a decision to perform a prefetch of the next data from the main memory to the cache memory only if the processor accesses a predetermined cache line section of the cache line wherein the cache section is dynamically adjusted based on a current status of operation of the processor. 7. A storage system as claimed in claim 6, wherein each cache line of the cache memory is subdivided into a plurality of cache line areas which have each a separate cache line area address, further comprising means for performing a comparison between cache line area addresses and cache line section addresses. 8. A storage system as claimed in claim 7, wherein a cache line section address to be used for the comparison is selected from among a plurality of cache line section addresses in dependence on a program section of a program run by the processor during access to the cache memory. 9. A storage system as claimed in claim 6, wherein: the cache memory includes a register memory in which prefetch data is written by the controller. 10. A storage system as claimed in claim 9, wherein: a plurality of register memories are provided in which the respective prefetch data of various prefetch operations is written. 11. A storage system as claimed in claim 10, wherein: when prefetch data to be written for the first time is written in the register memories, prefetch data most recently written in the register memories is not overwritten but remains available, while prefetch data least-recently written in the register memories is overwritten. t have been confirmed as being committed, and wherein the log also comprises a plurality of unconfirmed updates to the database data set that were made subsequent to the backup time point and that have not been confirmed as being committed; restoring the backup copy; accessing a change accumulation data set that comprises a plurality of detail records and a plurality of spill records, wherein each detail record corresponds to one of the plurality of database records and reflects all of the confirmed updates to the corresponding database record, and wherein each spill record comprises an unconfirmed update to the database data set; reading the change accumulation data set to obtain the plurality of detail records; reading the log to obtain the plurality of unconfirmed updates; determining which of the plurality of unconfirmed updates have been committed; and applying the plurality of detail records and the plurality of unconfirmed updates determined to have been committed to the backup copy to thereby create a restored database data set. 12. The method of claim 11 further comprising reading the log simultaneously with a second log to derive updates subsequent to the merge end point. 13. The method of claim 11 further comprising determining the merge end point, wherein the merge end point is reflective of a separation of detail and spill records in the log. 14. The method of claim 11 wherein reading the backup copy is executed simultaneously with reading the detail records. 15. The method of claim 11 further comprising storing at least a portion of the detail records in a virtual memory. 16. The method of claim 11, further comprising sending a query to a change accumulation manager for a detail record associated with the database data set. 17. The method of claim 16 further comprising saving the query if the detail record has not yet been rea