Ebere Abanonu eaba

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Presto Specific

Don’t SELECT *, Specify explicit column names (columnar store)
Avoid large JOINs (filter each table first)
- In PRESTO tables are joined in the order they are listed!!
- Join small tables earlier in the plan and leave larger fact tables to the end
- Avoid cross joins or 1 to many joins as these can degrade performance
Order by and group by take time
- only use order by in subqueries if it is really necessary
When using GROUP BY, order the columns by the highest cardinality (that is, most number of unique values) to the lowest.

	using System;
	using System.Threading.Tasks;
	using Akka.Actor;
	using Akka.Pattern;
	using Akka.Streams.Dsl;
	using LanguageExt;

	namespace Akka.Persistence.Sql.Linq2Db.Journal.DAO
	{
	public class BatchFlowControl

	using System;
	using System.Collections.Generic;
	using System.Text;

	namespace ProbabilisticDataStructures.DataStructures
	{
	public class BitSet
	{
	private ulong[] bitset;
	public int Size { get; private set; }

	using System;
	using System.Threading.Tasks;
	using Akka.Actor;
	using Akka.Configuration;

	namespace AkkaDemos
	{
	public interface IGreeter
	{
	Task<string> Greet(IGreeter who);

	listen 1935;
	max_connections 20;
	daemon on;
	pid /usr/local/srs/objs/srs.pid;
	srs_log_tank file; # console;
	srs_log_file /var/log/srs.log;
	ff_log_dir /dev/null;

	# can be: verbose, info, trace, warn, error
	srs_log_level warn;

	using Akka.Streams;
	using Akka.Streams.Stage;
	using System;
	using System.Collections.Generic;
	using System.Text;
	using System.Threading.Tasks;

	namespace Demo
	{
	sealed class PreFetch<T> : GraphStage<SourceShape<T>>

	<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
	<OutputType>Exe</OutputType>
	<TargetFramework>netcoreapp2.0</TargetFramework>
	<AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
	<RootNamespace></RootNamespace>
	<IsPackable>False</IsPackable>
	<NoWarn>CS0649;CS0169</NoWarn>

	using System;
	using System.Security.Cryptography;

	/// <summary>
	/// Computes and verifies proof-of-work challenges inspired by Hashcash to deter denial of service attacks and other service abuses such as spam.
	/// </summary>
	public sealed class HashPuzzle
	{

	#region " Properties "

	using Org.BouncyCastle.Asn1.Pkcs;
	using Org.BouncyCastle.Asn1.Sec;
	using Org.BouncyCastle.Asn1.X509;
	using Org.BouncyCastle.Asn1.X9;
	using Org.BouncyCastle.Crypto;
	using Org.BouncyCastle.Crypto.Generators;
	using Org.BouncyCastle.Crypto.Operators;
	using Org.BouncyCastle.Crypto.Parameters;
	using Org.BouncyCastle.Math;
	using Org.BouncyCastle.Security;