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MacのPostgreSQLでFATAL: could not create shared memory segment: Cannot allocate memoryが出る場合の対応

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Mac(OS X 10.7で確認)はカーネルで取得できるshared memoryの量がかなり低く設定されているので、shared bufferを確保できずにエラーになることがあります。

$ pg_ctl start                              
server starting
FATAL:  could not create shared memory segment: Cannot allocate memory 

その場合は、パラメータを調整してやれば動きます。

sudo sysctl -w kern.sysv.shmmax=1073741824
sudo sysctl -w kern.sysv.shmall=1073741824
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