当对一个表运行RUNSTATS时，有两种用户访问选项：允许读访问和允许写访问。
There are two options for user access to a table while a RUNSTATS is running against that table: allow read access and allow write access.
在执行操作时，读访问将被允许。
当遇到日志写满情况，仍允许对数据库的读访问。
When a log full condition is encountered, read access is still allowed on the database.
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