protected override void OnExecute()
{
using (var scope = new DatabaseScope(context.Database.Name))
{
foreach (var env in context.HPartitioningDesignData.Environments)
{
try
{
virtualHPartitioningsRepository.DestroyAll();
bool hPartitioningCreated = false;
try
{
var targetRelationData = context.RelationsData.GetReplacementOrOriginal(env.Partitioning.Relation.ID);
virtualHPartitioningsRepository.Create(dbObjectDefinitionGenerator.Generate(env.Partitioning.WithReplacedRelation(targetRelationData)));
hPartitioningCreated = true;
}
catch (Exception ex)
{
log.Write(ex);
}
if (hPartitioningCreated)
{
foreach (var queryPair in context.StatementsData.AllQueriesByRelation[env.Partitioning.Relation.ID])
{
var statementID = queryPair.NormalizedStatementID;
if (!env.StatementsEvaluation.ContainsKey(statementID))
{
var workloadStatement = context.StatementsData.All[statementID];
var normalizedStatement = workloadStatement.NormalizedStatement;
var representativeStatement = workloadStatement.RepresentativeStatistics.RepresentativeStatement;
var statementToUse = RepresentativeStatementReplacementUtility.Provide(normalizedStatement, representativeStatement, context.RelationsData);
var realPlan = context.RealExecutionPlansForStatements[statementID].Plan;
IExplainResult explainResult = context.RealExecutionPlansForStatements[statementID];
var latestPlan = realPlan;
if (normalizedStatement.CommandType == DAL.Contracts.StatementQueryCommandType.Select ||
normalizedStatement.CommandType == DAL.Contracts.StatementQueryCommandType.Insert) // hypo pg currently does not support explain for delete/update for h partitioning
{
try
{
explainResult = explainRepository.Eplain(statementToUse);
latestPlan = explainResult.Plan;
}
catch (Exception ex)
{
log.Write(ex);
}
}
VirtualEnvironmentStatementEvaluation statementEvaluation = new VirtualEnvironmentStatementEvaluation();
statementEvaluation.ExecutionPlan = explainResult;
decimal fromPrice = realPlan.TotalCost;
decimal toPrice = latestPlan.TotalCost;
decimal divisor = Math.Abs(Math.Max(fromPrice, toPrice));
if (divisor > 0)
{
statementEvaluation.LocalImprovementRatio = ((toPrice - fromPrice) / divisor) * -1m;
}
decimal statementPortion = context.StatementsData.AllExecutionsCount > 0 ? workloadStatement.TotalExecutionsCount / (decimal)context.StatementsData.AllExecutionsCount : 0m;
statementEvaluation.GlobalImprovementRatio = statementEvaluation.LocalImprovementRatio * statementPortion;
env.StatementsEvaluation.Add(statementID, statementEvaluation);
env.Evaluation.ImprovementRatio += statementEvaluation.GlobalImprovementRatio;
}
}
env.IsImproving = env.Evaluation.ImprovementRatio >= settings.HPartitioningMinTotalImprovementRatio;
}
}
finally
{
virtualHPartitioningsRepository.DestroyAll();
}
}
}
}
protected override void OnExecute()
{
context.IndicesDesignData.PossibleIndexSizes.Clear();
#if DEBUG
int counter = 0;
#endif
using (var scope = new DatabaseScope(context.Database.Name))
{
foreach (var env in context.IndicesDesignData.Environments)
{
#if DEBUG
if (System.Diagnostics.Debugger.IsAttached)
{
++counter;
if (counter % 10 == 0)
{
Console.WriteLine(((counter / (double)context.IndicesDesignData.Environments.Count) * 100).ToString("F2") + "%");
}
}
#endif
try
{
virtualIndicesRepository.DestroyAll();
var virtualIndicesMapping = new Dictionary <IndexDefinition, IVirtualIndex>();
bool indicesCreated = false;
try
{
foreach (var index in env.PossibleIndices.All)
{
var targetRelationData = context.RelationsData.GetReplacementOrOriginal(index.Relation.ID);
var virtualIndex = virtualIndicesRepository.Create(dbObjectDefinitionGenerator.Generate(index.WithReplacedRelation(targetRelationData)));
if (virtualIndex != null)
{
virtualIndicesMapping.Add(index, virtualIndex);
}
if (!context.IndicesDesignData.PossibleIndexSizes.ContainsKey(index))
{
context.IndicesDesignData.PossibleIndexSizes.Add(index, virtualIndicesRepository.GetVirtualIndexSize(virtualIndex.ID));
}
}
indicesCreated = true;
}
catch (Exception ex)
{
log.Write(ex);
}
if (indicesCreated)
{
foreach (var kv in env.PossibleIndices.AllPerStatement)
{
var statementID = kv.Key;
var indices = kv.Value;
var workloadStatement = context.StatementsData.All[statementID];
var normalizedStatement = workloadStatement.NormalizedStatement;
var representativeStatement = workloadStatement.RepresentativeStatistics.RepresentativeStatement;
var statementToUse = RepresentativeStatementReplacementUtility.Provide(normalizedStatement, representativeStatement, context.RelationsData);
var explainResult = explainRepository.Eplain(statementToUse);
var latestPlan = explainResult.Plan;
var realPlan = context.RealExecutionPlansForStatements[statementID].Plan;
HashSet <IndexDefinition> improvingVirtualIndices = new HashSet <IndexDefinition>();
VirtualEnvironmentStatementEvaluation statementEvaluation = new VirtualEnvironmentStatementEvaluation();
statementEvaluation.ExecutionPlan = explainResult;
decimal fromPrice = realPlan.TotalCost;
decimal toPrice = latestPlan.TotalCost;
decimal divisor = Math.Abs(Math.Max(fromPrice, toPrice));
if (divisor > 0)
{
statementEvaluation.LocalImprovementRatio = ((toPrice - fromPrice) / divisor) * -1m;
}
decimal statementPortion = context.StatementsData.AllExecutionsCount > 0 ? workloadStatement.TotalExecutionsCount / (decimal)context.StatementsData.AllExecutionsCount : 0m;
statementEvaluation.GlobalImprovementRatio = statementEvaluation.LocalImprovementRatio * statementPortion;
env.StatementsEvaluation.Add(statementID, statementEvaluation);
foreach (var i in indices)
{
var virtualIndex = virtualIndicesMapping[i];
if (!env.IndicesEvaluation.ContainsKey(i))
{
env.IndicesEvaluation.Add(i, new VirtualIndicesEnvironmentIndexEvaluation());
}
if (explainResult.UsedIndexScanIndices.Contains(virtualIndex.Name))
{
statementEvaluation.UsedIndices.Add(i);
statementEvaluation.AffectingIndices.Add(i);
if (latestPlan.TotalCost < realPlan.TotalCost)
{
improvingVirtualIndices.Add(i);
}
env.IndicesEvaluation[i].ImprovementRatio += statementEvaluation.GlobalImprovementRatio;
}
else
{
if (normalizedStatement.CommandType == DAL.Contracts.StatementQueryCommandType.Insert ||
normalizedStatement.CommandType == DAL.Contracts.StatementQueryCommandType.Update ||
normalizedStatement.CommandType == DAL.Contracts.StatementQueryCommandType.Delete)
{
statementEvaluation.AffectingIndices.Add(i);
}
}
}
foreach (var query in normalizedStatement.StatementDefinition.IndependentQueries)
{
var queryKey = new NormalizedStatementQueryPair(statementID, query);
env.ImprovingPossibleIndices.TryAddPossibleIndices(improvingVirtualIndices, normalizedStatement, query);
if (env.PossibleIndices.AllCoveringPerQuery.ContainsKey(queryKey))
{
env.ImprovingPossibleIndices.TryAddPossibleCoveringIndices(env.PossibleIndices.AllCoveringPerQuery[queryKey].Intersect(improvingVirtualIndices), normalizedStatement, query);
}
}
}
}
}
finally
{
virtualIndicesRepository.DestroyAll();
}
}
}
}