and <literal>mmap</literal> (to simulate shared memory using

memory-mapped files stored in the data directory).

Not all values are supported on all platforms; the first supported

option is the default for that platform. The use of the

option isusuallythe default for that platform. The use of the

<literal>mmap</literal> option, which is not the default on any platform,

is generally discouraged because the operating system may write

modified pages back to disk repeatedly, increasing system I/O load;

# sysv

# windows

# (change requires restart)

#dynamic_shared_memory_type = posix# the default is the first option

#dynamic_shared_memory_type = posix# the default isusuallythe first option

# supported by the operating system:

# posix

# sysv

choose_dsm_implementation(void)

{

intntries=10;

pg_prng_stateprng_state;