June 2001
Intermediate to advanced
688 pages
19h 18m
English
Content preview from Berkeley DB
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Log File Limits
Log filenames and sizes impose a limit on how long databases may be used in a Berkeley DB database environment. It is quite unlikely that an application will reach this limit; however, if the limit is reached, the Berkeley DB environment’s databases must be dumped and reloaded.
The log filename consists of log, followed by 10 digits, with a maximum of 2,000,000,000 log files. Consider an application performing 6000 transactions per second for 24 hours a day, logged into 10MB log files, in which each transaction is logging approximately 500 bytes of data. The following calculation indicates that the system will run out of log filenames in roughly 221 years:
(10 * 2^20 * 2000000000)/(6000 * 500 * 365 * 60 * 60 * 24) = ∼221