TimesTen日志没有自动清除的原因之一
TimesTen的日志文件最好单独划分一个分区来存储，因为很有可能被他产生的日志文件把磁盘占满。当然正常情况下是不存在这个问题的哈。
官方网站上说，日志文件在下面几个事情没有完成前，是不会被删除的（参见Oracle官网）：
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All transactions writing log records to the transaction log file (or a previous transaction log file) have committed or rolled back.
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All changes recorded in the transaction log file have been written to the checkpoint files on disk.
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All changes recorded in the transaction log file have been replicated (if replication is used).
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All changes recorded in the transaction log file have been propagated to the Oracle database if the IMDB Cache has been configured for that behavior.
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All changes recorded in transaction log files have been reported to the XLA applications (if XLA is used).
所以当我们遇见日志文件在不断增长时，通常可以做如下一下操作：
2. 检查配置文件中是否设置了系统定时做checkpoint，如果CkptFrequency的值为0，则表示不定时checkpoint，这时日志是不会自动删除的。如果没有设置定时Checkpoint，手动执行（call ckpt;）Checkpoint也未必可以让日志自动被清除。