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Multi-Version Concurrency ControlNextLocking and Tables Postgres provides various lock modes to control concurrent access to data in tables . Multi-Version Concurrency Control Because readers in 6.5 do n't lock data , regardless of transaction isolation level , data read by one transaction can be overwritten by another . The new Multi-Version Concurrency Control ( MVCC ) features can give somewhat different behaviors in multi-user environments . Multi-Version Concurrency ControlNextData consistency checks at the application level Because readers in Postgres do n't lock data , regardless of transaction isolation level , data read by one transaction can be overwritten by another . He developed innovative designs of tributary outlet channels for the ongoing Sims Bayou flood control project in Houston and is currently modeling hurricane-induced flooding on Florida ’ s Gulf Coast ; the modeling is used to evaluate the ability of bridges over coastal waterways to withstand the surges caused by extreme storms and to facilitate emergency evacuations . He also wrote a chapter on it for the Programmer 's Guide.Jan also contributed a second procedural language , PL / pgSQL , to go with the original PL / pgTCL procedural language he contributed last release.We have optional multiple-byte character set support from Tatsuo Iishi to complement our existing locale support.Client / server communications has been cleaned up , with better support for asynchronous messages and interrupts thanks to Tom Lane.The parser will now perform automatic type coersion to match arguments to available operators and functions , and to match columns and expressions with target columns . To assist ecologists and resource managers , Lionberger developed a numerical model of water level and salinity in a salt pond .