Postgresql 中文操作指南

73.5. The Initialization Fork #

每张未记录的表以及未记录表上的每个索引都具有一个初始化分支。初始化分支是相应用类型的空表或索引。当未记录的表由于崩溃而必须重置为空时，将通过主分支复制初始化分支，并删除所有其他分支（根据需要将自动重新创建这些分支）。

Each unlogged table, and each index on an unlogged table, has an initialization fork. The initialization fork is an empty table or index of the appropriate type. When an unlogged table must be reset to empty due to a crash, the initialization fork is copied over the main fork, and any other forks are erased (they will be recreated automatically as needed).