Database | Database Type | GitHub repository |
---|---|---|
4store | RDF | https://github.com/4store/4store |
abhot | Time Series | https://github.com/quqiangsheng/abhot |
Accumulo | Key/Value | https://github.com/apache/accumulo |
AceDB | Genome | https://github.com/richarddurbin/acedb |
ActorDB | Distributed Relational | https://github.com/biokoda/actordb |
Aerospike | Key/Value | https://github.com/aerospike/aerospike-server |
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Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |
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#!/usr/bin/python3 | |
# Press [Ctrl]+[C] to terminate the program | |
import seeed_dht | |
sensor = seeed_dht.DHT(seeed_dht.DHT.DHT_TYPE["DHT22"], 12) # DHT type 22, pin 12 | |
try: | |
while True: | |
humi, temp = sensor.read() | |
print('DHT{0}, humidity {1:.1f}%, temperature {2:.1f}C'.format(sensor.dht_type, humi, temp)) | |
except KeyboardInterrupt: | |
print("Exiting program.") |
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#!/usr/bin/python3 | |
# Press [Ctrl]+[C] to terminate the program | |
from grove.grove_air_quality_sensor_v1_3 import GroveAirQualitySensor | |
air_quality_sensor = GroveAirQualitySensor(0) # Pin 0 for A0 | |
try: | |
while True: | |
# pollution ratio: 0(0.0% and best air quality) - 1000(100.0% worst air quality) | |
value = air_quality_sensor.value | |
pollution_percent = value / 10 | |
print("Air pollution at {0:.1f}%".format(pollution_percent)) |
Print a nice little Christmas tree with recursive SQL and some UNION ALL
:
set heading off;
set feedback off;
WITH tree(lev, xmas) AS (
SELECT 1 lev, RPAD(' ', 10, ' ')
|| '*' xmas
FROM dual
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sql() { | |
# REMOTE source this script | |
# | |
# . <(curl -s https://gist.githubusercontent.com/krisrice/fec43fd9f53e4286e5cc360b554e3c0f/raw/62ec382d7511c7cc44703a9a2f75a4a7f233efe2/sqlcl.sh) | |
# Set the stage directory | |
STAGE_DIR=/var/tmp | |
# Check whether internet connection exists | |
if ping -c 1 -W 3 download.oracle.com > /dev/null; then |
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git rev-list --objects --all | | |
git cat-file --batch-check='%(objecttype) %(objectname) %(objectsize) %(rest)' | | |
sed -n 's/^blob //p' | | |
sort --numeric-sort --key=2 | | |
cut -c 1-12,41- | | |
$(command -v gnumfmt || echo numfmt) --field=2 --to=iec-i --suffix=B --padding=7 --round=nearest |
LOCATION=$(curl -s https://api.github.com/repos/<YOUR ORGANIZTION>/<YOUR REPO>/releases/latest \
| grep "zipball_url" \
| awk '{ print $2 }' \
| sed 's/,$//' \
| sed 's/"//g' ) \
; curl -L -o <OUTPUT FILE NAME> $LOCATION
for example: