vacuum不做任何操作 vacuum full重建索引 Confidential │ ©2021 VMware, Inc. Brin Storage Revmap是一个逻辑上的数组，数组下标代表BlockNumber Revmap的value是TID，指向存储有最大最小值的tuple Confidential │ ©2021 VMware, Inc. 目录 Brin Index ©2021 VMware, Inc. Revmap With AO Confidential │ ©2021 VMware, Inc. Add an upper level Confidential │ ©2021 VMware, Inc. Brin on AO Storage Upper Level：定长数据段，约为3.2MB RevMap：变长数据段，大小随数据表数据 量变化，向后增长 relationship between the block number and the upper level array upper_index=blocknum/TidNumPerPage revmap_offset=blocknum%TidNumPerPage Confidential │ ©2021 VMware, Inc. 目录 Brin Index AppendOnly