Joseph Doherty
1627513fdb
AuditLog indexes are raw SQL ON ps_AuditLog_Month so they stay partition-aligned for the switch purge.
73 lines
3.0 KiB
C#
73 lines
3.0 KiB
C#
using Microsoft.EntityFrameworkCore.Migrations;
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#nullable disable
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namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Migrations
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{
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/// <summary>Review-remediation composite indexes on AuditLog (partition-aligned, raw SQL) and AuditLogEntries.</summary>
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public partial class ReviewRemediationIndexes : Migration
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{
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/// <inheritdoc />
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protected override void Up(MigrationBuilder migrationBuilder)
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{
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migrationBuilder.CreateIndex(
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name: "IX_AuditLogEntries_EntityType_Timestamp",
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table: "AuditLogEntries",
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columns: new[] { "EntityType", "Timestamp" },
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descending: new[] { false, true });
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migrationBuilder.CreateIndex(
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name: "IX_AuditLogEntries_Timestamp_Id",
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table: "AuditLogEntries",
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columns: new[] { "Timestamp", "Id" },
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descending: new bool[0]);
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migrationBuilder.CreateIndex(
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name: "IX_AuditLogEntries_User_Timestamp",
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table: "AuditLogEntries",
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columns: new[] { "User", "Timestamp" },
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descending: new[] { false, true });
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// AuditLog is monthly-partitioned (ps_AuditLog_Month) with a partition-switch
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// purge, so these two indexes MUST be partition-aligned. EF's CreateIndex cannot
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// express the ON ps_AuditLog_Month(OccurredAtUtc) clause -> raw SQL, exactly as
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// IX_AuditLog_Node_Occurred (AddAuditLogSourceNode). Kind is a PERSISTED computed
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// column, so it is indexable. On a large production AuditLog consider adding
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// WITH (ONLINE = ON) (Enterprise edition) to the generated script.
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migrationBuilder.Sql(@"
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CREATE NONCLUSTERED INDEX IX_AuditLog_Kind_Occurred
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ON dbo.AuditLog (Kind, OccurredAtUtc DESC)
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ON ps_AuditLog_Month(OccurredAtUtc);");
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migrationBuilder.Sql(@"
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CREATE NONCLUSTERED INDEX IX_AuditLog_Actor_Occurred
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ON dbo.AuditLog (Actor, OccurredAtUtc DESC)
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ON ps_AuditLog_Month(OccurredAtUtc);");
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}
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/// <inheritdoc />
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protected override void Down(MigrationBuilder migrationBuilder)
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{
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migrationBuilder.DropIndex(
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name: "IX_AuditLogEntries_EntityType_Timestamp",
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table: "AuditLogEntries");
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migrationBuilder.DropIndex(
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name: "IX_AuditLogEntries_Timestamp_Id",
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table: "AuditLogEntries");
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migrationBuilder.DropIndex(
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name: "IX_AuditLogEntries_User_Timestamp",
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table: "AuditLogEntries");
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migrationBuilder.Sql(@"
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IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_AuditLog_Actor_Occurred' AND object_id = OBJECT_ID('dbo.AuditLog'))
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DROP INDEX IX_AuditLog_Actor_Occurred ON dbo.AuditLog;");
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migrationBuilder.Sql(@"
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IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_AuditLog_Kind_Occurred' AND object_id = OBJECT_ID('dbo.AuditLog'))
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DROP INDEX IX_AuditLog_Kind_Occurred ON dbo.AuditLog;");
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}
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}
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}
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