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Merge feat/668-modified-values: Part 11 modified-value history (IsReadModified) on SqlServer + QuestDB (#668)

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Joseph Doherty
2026-10-11 09:32:13 -04:00
parent 699871040a cfd403710e
commit 062086f9a6
51 changed files with 2173 additions and 195 deletions
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src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer/SqlServerHistorianRetention.cs
+13 -3
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@@ -7,7 +7,7 @@ using ZB.MOM.WW.OtOpcUa.Runtime.Historian;
namespace ZB.MOM.WW.OtOpcUa.Driver.Historian.SqlServer;
/// <summary>
/// Deletes <c>hist.Sample</c> / <c>hist.Event</c> rows older than the retention window, in small
/// Deletes <c>hist.Sample</c> / <c>hist.SampleModified</c> / <c>hist.Event</c> rows older than the retention window, in small
/// <c>DELETE TOP(n)</c> batches (under the lock-escalation threshold). Samples are purged per tag so each
/// delete is a seek on the clustered key <c>(TagId, SourceTimeUtc)</c>; events seek on <c>CX_Event_Time</c>.
/// A session <c>sp_getapplock</c> (timeout 0) serialises purgers that share one database; a loser skips.
@@ -69,7 +69,7 @@ internal sealed class SqlServerHistorianRetention : IHistorianRetention
return [];
}
long samples = 0;
long samples = 0, modified = 0;
var tagIds = new List<int>();
await using (var cmd = _conn.CreateCommand(conn, $"SELECT TagId FROM {_conn.Q("Tag")}"))
await using (var r = await cmd.ExecuteReaderAsync(ct).ConfigureAwait(false))
@@ -80,13 +80,23 @@ internal sealed class SqlServerHistorianRetention : IHistorianRetention
samples += await DeleteLoopAsync(conn,
$"DELETE TOP (@n) FROM {_conn.Q("Sample")} WHERE TagId = @id AND SourceTimeUtc < @cutoff",
cutoff, id, ct).ConfigureAwait(false);
// The Part 11 modification trail (#668) ages out on the SAME source-time cutoff as the samples it
// describes; a purge never writes to it (no trigger, no OUTPUT INTO).
modified += await DeleteLoopAsync(conn,
$"DELETE TOP (@n) FROM {_conn.Q("SampleModified")} WHERE TagId = @id AND SourceTimeUtc < @cutoff",
cutoff, id, ct).ConfigureAwait(false);
}
var events = await DeleteLoopAsync(conn,
$"DELETE TOP (@n) FROM {_conn.Q("Event")} WHERE EventTimeUtc < @cutoff",
cutoff, null, ct).ConfigureAwait(false);
return [new RetentionPurgeResult("Sample", samples), new RetentionPurgeResult("Event", events)];
return
[
new RetentionPurgeResult("Sample", samples),
new RetentionPurgeResult("SampleModified", modified),
new RetentionPurgeResult("Event", events),
];
}
finally
{