You can query out the definitions those are older more than one year by this query in SQL Server.
SELECT [DefinitionId],[DefinitionVersion],[DefinitionName] FROM [Tfs_CollectionLC].[Build].[tbl_Definition]
WHERE [CreatedOn] < '2016-06-12 00:00:00.000'
But for the definitions are no longer in use, you have to get the last build for each definition and check whether the build FinishTime is before a year ago (Where [FinishTime] < '2016-06-12 00:00:00.000' ).
You can use TFS API/Client API to get the build details which including the build FinishTime, then filter them accordingly.You can reference below code which enumerates each team project and gets the latest build status for each of the definitions:
TfsTeamProjectCollection tfs = new TfsTeamProjectCollection(new Uri("http://tfs:8080"));
var vcs = tfs.GetService<VersionControlServer>();
var teamProjects = vcs.GetAllTeamProjects(true);
IBuildServer buildServer = (IBuildServer)tfs.GetService(typeof(IBuildServer));
foreach (TeamProject proj in teamProjects)
{
var defs = buildServer.QueryBuildDefinitions(proj.Name);
System.Console.WriteLine(string.Format("Team Project: {0}", proj.Name));
foreach(IBuildDefinition def in defs)
{
IBuildDetailSpec spec = buildServer.CreateBuildDetailSpec(proj.Name, def.Name);
spec.MaxBuildsPerDefinition = 1;
spec.QueryOrder = BuildQueryOrder.FinishTimeDescending;
var builds = buildServer.QueryBuilds(spec);
if (builds.Builds.Length > 0)
{
var buildDetail = builds.Builds[0];
System.Console.WriteLine(string.Format(" {0} - {1} - {2}", def.Name, buildDetail.Status.ToString(), buildDetail.FinishTime));
}
}
System.Console.WriteLine();
}
Reference this thread:TFS API - How to query builds independent of which build definition they belong to
Update: Based on @Dhurva's comments below:
We can also use the utility from github TFS Manager that finds all build definition from team project:
https://github.com/jelledruyts/TfsTeamProjectManager