add scratchpad ns and transactor settings for experiments.

clj/datomic/.gitignore

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/target
/data
.nrepl-port
.lein*

clj/datomic/datomic-transactor.properties

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################################################################
protocol=free
host=localhost
port=4334
################################################################
# See http://docs.datomic.com/capacity.html
# Recommended settings for -Xmx4g, ongoing usage.
# memory-index-threshold=32m
# memory-index-max=128m
# object-cache-max=1g
# Recommended settings for -Xmx4g import jobs.
# memory-index-threshold=512m
# memory-index-max=1g
# object-cache-max=1g
# Recommended settings for -Xmx1g usage, e.g. dev laptops.
memory-index-threshold=32m
memory-index-max=128m
object-cache-max=128m
## OPTIONAL ####################################################
# Set to false to disable SSL between the peers and the transactor.
# Default: true
# encrypt-channel=true
# Data directory is used for dev: and free: storage, and
# as a temporary directory for all storages.
data-dir=/home/lu/k/lp/clj/datomic/data
# Transactor will log here, see bin/logback.xml to configure logging.
# log-dir=log
# Transactor will write process pid here on startup
# pid-file=transactor.pid
## OPTIONAL ####################################################
# See http://docs.datomic.com/capacity.html
# Soft limit on the number of concurrent writes to storage.
# Default: 4, Miniumum: 2
# write-concurrency=4
# Soft limit on the number of concurrent reads to storage.
# Default: 2 times write-concurrency, Miniumum: 2
# read-concurrency=8

clj/datomic/src/scratchpad.clj

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(ns scratchpad
  "A place for experiments"
  (:require [datomic.api :as d]))
(defn connect-to [db-uri]
  (d/create-database db-uri)
  (d/connect db-uri))
(def conn (connect-to "datomic:free://localhost:4334/scratchpad"))
(defn db [] (d/db conn))