... 分区顺序存取法 partition sequential access method，PSAM 分区顺序档案 partition sequential file 分区集合 partition set ...
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The transaction log is stored as a sequential disk file (or sometimes in a raw partition) and will generally only be written to, not read from, except in the case of rollback or recovery.
事务日志存储为连续的磁盘文件(有时存储在原始分区中)，并且一般只是用于写入而不用于读取，回滚或恢复的情况例外。
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