Handling Relational Data in a Distributed Cache
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Most ASP.NET applications that needs scalability are data intensive and use relational database as their data store. This presentation provides information about relational data, object relational mapping, its management, caching strategies and handling collections in a distributed cache.
![Alachisoft
Peek into Caching API
Read from the Cache
Add to the Cache
object obj = cache.Get(“myKey”);
object obj = cache[“myKey”];
bool isPresent = cache.Contains(“myKey”);
cache.Add(“myKey”, obj);
cache.Insert(“myKey”, obj);
cache[“myKey”] = obj;
Remove from the Cache
NCache
object obj = cache.Remove(“myKey”);
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Handling Relational Data in a Distributed Cache
- 1. Alachisoft .NET Performance Solutions How to Handle Relational Data in a Distributed Cache Iqbal Khan [email protected] Ph: +1 (925) 236-2125 www.alachisoft.com 1
- 2. Alachisoft Following Applications Need Scalability 1. ASP.NET Apps 2. WCF & .NET Web Services 3. To quickly process very large amounts of data thru distribution Grid Computing Apps 5. To handle millions of requests Big Data Apps 4. To handle millions of users To process very large computations thru distribution Other .NET Server Apps NCache To handle millions of requests www.alachisoft.com 2
- 3. Alachisoft Data Storage is Scalability Bottleneck ASP.NET/WCF Example App Database ASP.NET/WCF Servers Database Servers Data Access Scale Web Farm Web Clients Http Calls ... NCache Load Balancer www.alachisoft.com ASP.NET Session Storage 3
- 4. Alachisoft The Solution Scalable In-Memory Distributed Cache NCache NCache www.alachisoft.com 4
- 5. Alachisoft What is an In-Memory Distributed Cache? 1. Cluster of multiple inexpensive cache servers 2. Synchronizes cache updates across all cache servers 3. Cache updates are immediately visible from all cache servers Linearly scales transaction & memory capacity 4. Pools their memory and CPU into one logical capacity Just add more cache servers to grow capacity Replicates data for reliability NCache Intelligent replication without compromising performance & scalability www.alachisoft.com 5
- 6. Alachisoft NCache: In-Memory Distributed Cache ASP.NET Web Apps WCF Web Services Grid Computing Apps (.NET) .NET Server Apps Distributed Cache Cluster Memory pooled from all cache servers Scale Horizontally Windows 2008/2012 (64-bit) Filesystem NCache Database Servers www.alachisoft.com Mainframe 6
- 7. Alachisoft What Data to Cache? 1. Reference Data 2. Transactional Data 3. Does not change very frequently (but is not static) Changes frequently (as frequently as in a few seconds) Most Cached Data is Relational NCache Comes from relational databases www.alachisoft.com 7
- 8. Alachisoft Challenge: Cache versus Relational Data Cache provides a Hashtable-like interface Each item is separate and has a “key” and a “value”. “Value” is usually an “object” Relational data has relationships between entities NCache This is a challenge for your application www.alachisoft.com 8
- 9. Alachisoft Peek into Caching API Read from the Cache Add to the Cache object obj = cache.Get(“myKey”); object obj = cache[“myKey”]; bool isPresent = cache.Contains(“myKey”); cache.Add(“myKey”, obj); cache.Insert(“myKey”, obj); cache[“myKey”] = obj; Remove from the Cache NCache object obj = cache.Remove(“myKey”); www.alachisoft.com 9
- 10. Alachisoft First Step: Use CacheDependency Lets you manage relationships in the cache One cached item depends on another A depends on B and B depends on C. Change in C triggers both A & B Feature introduced by ASP.NET Cache If target cached item updated/removed, dependent automatically removed Cascaded dependencies possible Cache keeps track of a one-way “dependency” between cached items Key based dependency is our focus here NCache also provides it NCache www.alachisoft.com 10
- 11. Alachisoft Second Step: Use Object Relational Mapping Benefits of O/R Mapping Benefits of O/R Mapping Tools Cut down development time Improve code quality in persistence & domain objects Simplifies programming. No need to directly use ADO.NET Which O/R Mapping Tools to Use? Simplifies programming by mapping domain objects to data model Promotes code reuse of persistence and domain objects Entity Framework (Microsoft) NHibernate (Open Source) At Least Map Domain Objects to Database NCache Map to database entities Capture relationships in these objects Transform DataReader or DataTable into domain objects www.alachisoft.com 11
- 12. Alachisoft Mapping Domain Objects to Database Data Model NCache www.alachisoft.com 12
- 13. Alachisoft What is a Primary Object? It is a domain object Starting point for the application Mapped to a table in the database Application fetches this objects first All other objects fetched in relation to this object All other objects fetched in relation to this object NCache One-to-many and many-to-one relationships www.alachisoft.com 13
- 14. Alachisoft Mapping Domain Objects to Database NCache www.alachisoft.com 14
- 15. Alachisoft 1-1/n-1 Relationships in Distributed Cache Strategy 1: cache related object with primary object Strategy 2: cache related object separately NCache www.alachisoft.com 15
- 16. Alachisoft 1-1/n-1 Relationships in Distributed Cache Cache related object with primary object NCache www.alachisoft.com 16
- 17. Alachisoft 1-1/n-1 Relationships in Distributed Cache Cache related object separately NCache www.alachisoft.com 17
- 18. Alachisoft 1-n Relationships in Distributed Cache Strategy 1: cache related objects collection with primary object Strategy 2: cache related objects separately separately Cache entire collection as part of the primary object Cache entire collection as one item but separately Strategy 3: cache related objects from collections separately NCache Cache each item of the collection separately www.alachisoft.com 18
- 19. Alachisoft 1-n Relationships in Distributed Cache Cache related object collection separately NCache www.alachisoft.com 19
- 20. Alachisoft 1-n Relationships in Distributed Cache Cache each object in related collection separately NCache www.alachisoft.com 20
- 21. Alachisoft m-n Relationships in Distributed Cache Many-to-many relationships don’t exist in domain objects Instead, represented by two one-to-many relationships E.g. Customer->Orders and Product->Orders Intermediary object contains many-to-one references NCache E.g. Order has a reference to Customer and Product www.alachisoft.com 21
- 22. Alachisoft Handling Collections in Distributed Cache Scenario 1: cache entire collection as one item Scenario 2: cache each collection item separately NCache www.alachisoft.com 22
- 23. Alachisoft Handling Collections in Distributed Cache Cache entire collection as one item NCache www.alachisoft.com 23
- 24. Alachisoft Handling Collections in Distributed Cache Cache each collection item separately NCache www.alachisoft.com 24
- 26. Alachisoft Some Object Caching Features Expirations Locking (Pessimistic & Optimistic) Lock/Unlock for pessimistic locking (writer-lock) Object versioning for optimistic locking (reader-lock) Bulk Operations Absolute-time + idle-time Auto-reload data on expiration (if read-thru enabled) Bulk Get, Add, Insert, and Remove Async Operations NCache Async Add, Insert, and Remove www.alachisoft.com 26
- 27. Alachisoft Synchronize Cache with Data Sources Synchronize with Relational Databases (SQL, Oracle, etc.) SqlDependency OracleDependency DbDependency Synchronize with non-Relational Data Sources NCache File based Cache Dependency Custom Cache Dependency www.alachisoft.com 27
- 28. Alachisoft Data Grouping in the Cache Group/Subgroup Tags Named Tags NCache www.alachisoft.com 28
- 29. Alachisoft Searching the Cache Parallel Queries with Object Query Language (OQL) Parallel LINQ Queries SQL-like query language to search cache based on object attributes Standard LINQ queries can search the cache Indexing Object Attributes for Querying NCache Create indexes on object attributes to speed up queries www.alachisoft.com 29
- 30. Alachisoft Some Other Features NHibernate L2 Cache Provider Entity Framework L2 Cache Plug into NHibernate application without any code change Plug into Entity Framework application without any code change Dynamic Compact Serialization NCache Faster and more compact then regular .NET serialization No code writing required www.alachisoft.com 30
- 31. Alachisoft What to Do Next? Find more about NCache Download 60-day Trial Request a Personalized LIVE Demo Read product Documentation Thank You NCache 4.1 www.alachisoft.com 31