STRYK System ImprovementPerformance Optimization & Troubleshooting

MS Dynamics NAV (Navision) since 1997

MS SQL Server since 2003

100% Focus on „NAV/SQL Performance Optimization“STRYK System Improvement (since 2006)Worldwide support of MS Dynamics Partners & Customers

Microsoft Most Valuable Professional(MVP MS Dynamics NAV)

Book: “NAV/SQL Performance Field Guide” (ISBN 978-3-8370-1442-6)

Software: “NAV/SQL Performance Toolbox” http://www.stryk.info/toolbox.html

Blog: “NAV/SQL Performance – My Two Cents” http://dynamicsuser.net/blogs/stryk/

Contact: contact@stryk.info http://www.stryk.info

Introduction Jörg Stryk

NAV/SQL High Availability:

High Availability with NAV and SQL ServerSome “Inspirations”

Abstract:

With increasing transaction volumes processed by NAV customers the need for HA solutions is also growing. This session will explain some available HA solutions with NAV and SQL as there are e.g. “Transaction Log-Shipping” and “Mirroring”, but also in addition with using “Database Snapshots”. The advantages and disadvantages of the several solutions are discussed to inspire NAV partners to implement the appropriate scenarios at their customer’s sites.

Agenda

Two Big Questions

What is the maximum acceptable Data-Loss?What is the maximum acceptable Server-Down-Time?

Off Topic

Backup Strategies (“Cold Stand-By”)

18:00 … 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00

Full

Diff Diff Diff Diff

Full

Log Log Log Log Log Log Log Log Log Log Log

Window Failover Cluster (“Hot Stand-By”)

Off Topic

Active Node Passive Node

Failover

Storage = „Single Point of Failure“

„Heartbeat“

Active Node Passive Node

Warm-Standby Solutions

• Transaction Log Shipping• Database Mirroring• Database Snapshots

Transaction Log Shipping

Warm-Standby Solutions

Failover NAVStandard NAV

Main Server Standby Server

NAV NAV(STANDBY)

Client PC

TRN

Monitor

Database Mirroring

Warm-Standby Solutions

Failover NAVStandard NAV

Principal Server Mirror Server

NAV NAV(NO RECOVERY)

Client PC

LSN

Witness

Synchronous vs. Asynchronous Mirroring

Warm-Standby Solutions

Principal Server Mirror ServerClient PC

LSN LSN

COMMIT COMMIT

aka „High Safety Mirroring“With Witness: „High Availability Mode“

No Witness: „High Protection Mode“

Witness

Synchronous vs. Asynchronous Mirroring

Warm-Standby Solutions

Principal Server Mirror ServerClient PC

LSN LSN

COMMIT COMMIT

aka „High Performance Mirroring“

Database Snapshots

Additional (?)

SQL Server (Enterprise)

NAV

NAV_SNAPSHOT(read only)

Client PC

SnapshotRead/Write

Read Only

Data „Freeze“

Demo

Overview

Option Edition Failover Witness Data-Loss Down-Time Performance MultipleMirrors

Connect to Mirror

Costs

Failover Cluster OS: EE Auto n/a minimal minimal high (Yes) n/a $$$

Mirroring (Async) SQL: EE Manual No small medium high No No $$

Mirroring (Sync) All (Auto) Yes minimal medium medium No No $

Log Shipping All (Auto) Yes medium medium medium Yes (Read Only) $

Backups All Manual No medium+ maximum medium Yes n/a $

DB Snapshots SQL: EE n/a n/a n/a n/a n/a n/a Read Only $$

HA & Failover Scenario

Failover NAV #1

Standard NAV

Reporting NAV

Principal Server Mirror Server

NAV NAV(NO RECOVERY)

NAV_SNAP(read only)

Snapshot

BackupBAK/TRN

SQL Backup

Client PC

Mirroring

Standby Server

NAV(STANDBY)

Log Shipping

Failover NAV #2

Challenges

What is the maximum acceptable Data-Loss?What is the maximum acceptable Server-Down-Time?

Transferring Logins

Notifications and Reactions

Time to get Standby-System online

Time to recover Backup

Time to get Primary-System online

Who/What/When

Re-Routing Clients/Service Tier(s)

Create detailed Checklistsand

Failover Plans.Weekend/Holiday

Interfaces

Licensing

Test your Plan!

SQL Server 2012 “Denali”

The Future

HADRON = High Availability & Disaster Recovery - Always ON

• Querying the Mirror (= Replica)• Multiple Replica• Database Availability Groups• Mirroring more than 10 databases• Faster Recovery• Automatic Failover

http://www.microsoft.com/sqlserver/en/us/product-info/future-editions.aspx

Q & A

Questions?Thanks for your attention!