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Antonios Giannopoulos Percona 2016 WiredTiger Configuration Variables

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WiredTiger	configura/on	variables	-	
Looking	under	the	hood	
Antonios	Giannopoulos	
Database	Administrator	–	Rackspace	
	
Percona	Live	Europe	2016
Agenda		
We	are	going	to	discuss	:	
	MongoDB	WiredTiger	Configura/on	Variables	
	
-  What	they	mean?	
-  How	to	configure/change?	
-  Benchmarks
Benchmark	specs	
Rackspace	OnMetal	Cloud	Server	v2	
12	cores		
32GB	RAM		
2x800GB	SSDs	(RAID	1)	
	
MongoDB	3.2.9		
	
Sysbench	for	MongoDB	by	Tim	Callaghan	using	default	
se[ngs
Benchmark	specs	
Sysbench:	
1)  Creates	16	collec/ons	10	million	documents	each	
2)  	Executes	a	mixed	workload	for	10	minutes		
	
Load:	Comple/on	/me	for	(1)	
TPS	CUM:	Average	number	of	Sysbench	transac/ons		
TPS	INT:	Number	of	Sysbench	transac/ons		
	
Samples	are	collected	every	10	seconds
WT	configura/on/Files	
Three	ways	to	change	WT	variables:	
mongod.conf:	engineConfig.configString	
run/me:	db.adminCommand(	{	setParameter:…})		
configura/on	file(s):	(WiredTiger.basecfg,	WiredTiger.config)	
	
The	order	of	configura/on	is:		
WiredTiger.basecfg	file		
wired/ger_open	configura/on	string	argument,	
WiredTiger.config	file,	
WIREDTIGER_CONFIG	environment	variable
WT	configura/on/mongod.conf	
	engineConfig:		
	 	cacheSizeGB:	<number>		
	 	journalCompressor:	<string>		
	 	directoryForIndexes:	<boolean>		
												configString:	<string>	,	<string>	…	
	collec/onConfig:		
	 	blockCompressor:	<string>		
	indexConfig:		
	 	prefixCompression:	<boolean>	
								setParameter:	
		 									wiredTigerConcurrentReadTransac/ons:	<number>	
		 									wiredTigerConcurrentWriteTransac/ons:	<number>

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