Hullo all, I'm attempting to store several sets of GPS derived spatial data (simple lat/lon mostly) in PostGIS and have hence installed PostgreSQL with the PostGIS extension on my iMac (running 10.6.6), the readme that comes with the PostgreSQL (at least for the latest version of it) casually warns of the need to increase -significantly- the amounts of shared memory availalbe for use. (See "attached" readme) Has anyone done this and what are the risks? I'm rather unwilling to mess with sysctl.conf simply to get PostGIS working.. but then I can always create and delete the file via [sudo] if things start getting weird.. that's an option as well.
Also and rather disconertingly the "warning" re: shared memory seems to come with/from the Mac OS X installer setup by http://www.enterprisedb.com (via http://www.postgresql.org/) and not with installers from http://www.kyngchaos.com/software:postgres (via http://postgis.refractions.net/) I'm new to this and will be using PostgreSQL/PostGIS (only) to demonstrate a prototype (at least initially) - i..e. DB will be pretty small. What is the best way to go about this issue and incidentally is pgAdmin any help at all with managing the DB? Any thoughts? [Readme] from http://www.enterprisedb.com follows: ---------------------------------------------------------------------------------------------------------------------------------------- Shared Memory ------------- PostgreSQL uses shared memory extensively for caching and inter-process communication. Unfortunately, the default configuration of Mac OS X does not allow suitable amounts of shared memory to be created to run the database server. Before running the installation, please ensure that your system is configured to allow the use of larger amounts of shared memory. Note that this does not 'reserve' any memory so it is safe to configure much higher values than you might initially need. You can do this by editting the file /etc/sysctl.conf - e.g. % sudo vi /etc/sysctl.conf On a MacBook Pro with 2GB of RAM, the author's sysctl.conf contains: kern.sysv.shmmax=1610612736 kern.sysv.shmall=393216 kern.sysv.shmmin=1 kern.sysv.shmmni=32 kern.sysv.shmseg=8 kern.maxprocperuid=512 kern.maxproc=2048 Note that (kern.sysv.shmall * 4096) should be greater than or equal to kern.sysv.shmmax. kern.sysv.shmmax must also be a multiple of 4096. Once you have edited (or created) the file, reboot before continuing with the installation. If you wish to check the settings currently being used by the kernel, you can use the sysctl utility: % sysctl -a The database server can now be installed.
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