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High Availability Database Solutions

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Rishikesh Tiwari
Rishikesh Tiwari
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High Availability
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Failover Clustering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Failover Clustering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring ,[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring Principal Clients Witness Mirror
Database Mirroring Initiating a Mirroring Session ,[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring Witness and Quorum ,[object Object],[object Object],[object Object],[object Object]
Database Mirroring Witness and Quorum ,[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring How it works Mirror Principal Witness Log Data Data Log Mirror is always redoing – it remains current Application SQL Server SQL Server 2 2 4 5 1 3 >2 >3 Commit
Database Mirroring Safety vs. Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Mirroring Transparent Client Redirect ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
FailOver Recap ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Warm Standby Solutions Replication and Log Shipping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Warm Standby Solutions Replication and Log Shipping ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Snapshots Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Snapshots Uses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Snapshots How They Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Snapshots Snapshot On a Mirror Mirror Principal Reporting Clients Database Mirroring Snapshot1 at 1PM Witness Snapshot2 at 2PM
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Isolation Levels ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Snapshot Isolation ,[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Read Committed Snapshot ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New Isolation Levels Database Settings ,[object Object],[object Object],[object Object]
Isolation Level Comparison Possible Anomalies Detected and rolled back No “Lost Update”! No Yes No No No No Update Conflict Optimistic No No No Snapshot Pessimistic No No No Serializable Pessimistic Yes No No Repeatable Read Pessimistic Optimistic Yes Yes Yes Yes No No Read Committed 1 Locking 2 Snapshot Yes Yes Yes Read Uncommitted Concurrency Control Phantoms Non-Repeatable Read Dirty Read Isolation Levels
On-line Index Operations Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Fast Recovery Restart or Restore ,[object Object],[object Object],[object Object],[object Object],Undo Redo Available Time Undo Redo Available
Database Maintenance and Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Maintenance and Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Database Maintenance and Operations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Upgrade Enhancements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Availability Barriers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Data Partitioning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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High Availability Database Solutions

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  • 8. Database Mirroring Principal Clients Witness Mirror
  • 9.
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  • 12. Database Mirroring How it works Mirror Principal Witness Log Data Data Log Mirror is always redoing – it remains current Application SQL Server SQL Server 2 2 4 5 1 3 >2 >3 Commit
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  • 22. Database Snapshots Snapshot On a Mirror Mirror Principal Reporting Clients Database Mirroring Snapshot1 at 1PM Witness Snapshot2 at 2PM
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  • 30. Isolation Level Comparison Possible Anomalies Detected and rolled back No “Lost Update”! No Yes No No No No Update Conflict Optimistic No No No Snapshot Pessimistic No No No Serializable Pessimistic Yes No No Repeatable Read Pessimistic Optimistic Yes Yes Yes Yes No No Read Committed 1 Locking 2 Snapshot Yes Yes Yes Read Uncommitted Concurrency Control Phantoms Non-Repeatable Read Dirty Read Isolation Levels
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