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maintenance.sgml 错别字纠正:回滚点->回卷点
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postgresql/doc/src/sgml/maintenance.sgml

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@@ -958,7 +958,7 @@ WARNING: database "mydb" must be vacuumed within 177009986 transactions
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HINT: To avoid a database shutdown, execute a database-wide VACUUM in "mydb".
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</programlisting>
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(如该示意所建议的,一次手动的<command>VACUUM</>应该会修复该问题;但是注意该次<command>VACUUM</>必须由一个超级用户来执行,否则它将无法处理系统目录并且因而不能推进数据库的<structfield>datfrozenxid</>)。如果这些警告被忽略,一旦距离回滚点只剩下 1 百万个事务时,该系统将会关闭并且拒绝开始任何新的事务:
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(如该示意所建议的,一次手动的<command>VACUUM</>应该会修复该问题;但是注意该次<command>VACUUM</>必须由一个超级用户来执行,否则它将无法处理系统目录并且因而不能推进数据库的<structfield>datfrozenxid</>)。如果这些警告被忽略,一旦距离回卷点只剩下 1 百万个事务时,该系统将会关闭并且拒绝开始任何新的事务:
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<programlisting>
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ERROR: database is not accepting commands to avoid wraparound data loss in database "mydb"

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