With the help of a DBENV with DB_LOG_IN_MEMORY and DB_TXN_NOSYNC

A BDB running as transaction data store. I have create a DB_ENV and before opening it, set the log configuration to use DB_LOG_IN_MEMORY, send me of ACI (without the D). What changes (if any) on the definition of the DB_TXN_NOSYNC on DB_ENV open?

Thanks, k

Hi Kedar,

The Berkeley DB log files do overwrite not several times the same file system blocks as Berkeley DB log files are not implemented as a circular buffer, and the log files are not reused. For this reason, the Berkeley DB log files should not pose difficulties for configurations of memory Flash.

However, as Berkeley DB does not log records to write in pieces the size of block file system, it is likely that postings of sequential transactions (which each empty the log file on the backup file system), will write twice, a block of Flash memory as the last record in the first validation log will write the same Flash memory block as the first record in the second validation log. Applications requiring no not of absolute longevity must specify the DB_TXN_WRITE_NOSYNC or DB_TXN_NOSYNC flags to the DB_ENV-> set_flags() method to avoid this replacement of a block of Flash memory.

For more details, please see [configurations only memory or Flash | http://www.oracle.com/technology/documentation/berkeley-db/db/programmer_reference/program_ram.html]

Bogdan Coman

Tags: Database

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