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What happens if a reader tries to open the database while a writer is doing something?

April 26, 2017database doing happens reader tries Writer

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What happens if a reader tries to open the database while a writer is doing something?

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(Rich Neill) Access will be denied until the writer releases its lock. JavaGDBM uses a shared-read/exclusive-write protocol at the OS level. However, multiple Java threads can access a file concurrently.