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The alternative to NOCACHE is CACHE or CACHE READS This clause controls whether or not the LOBSEGMENT data is stored in the buffer cache The default NOCACHE implies that every access will be a direct read from disk and every write/modification will likewise be a direct read from disk CACHE READS allows LOB data that is read from disk to be buffered, but writes of LOB data will be done directly to disk CACHE permits the caching of LOB data during both reads and writes In many cases, the default might not be what you want If you have small- to medium-sized LOBS (eg, you are using them to store descriptive fields of just a couple of kilobytes), caching them makes perfect sense.

Figure 6-8. Inheritance hierarchy for BusinessListBase(Of T)

If they are not cached, when the user updates the description field the user must also wait for the I/O to write the data to disk (an I/O the size of a CHUNK will be performed and the user will wait for this I/O to complete) If you are performing a large load of many LOBs, you will have to wait for the I/O to complete on each row as they are loaded It makes sense to enable caching on these LOBs You may turn caching on and off easily ALTER TABLE tabname MODIFY LOB (lobname) ( CACHE ); ALTER TABLE tabname MODIFY LOB (lobname) ( NOCACHE ); to see the effect this may have on you.

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For a large initial load, it would make sense to enable caching of the LOBs and allow DBWR to write the LOB data out to disk in the background while your client application keeps loading more For small- to medium-sized LOBs that are frequently accessed or modified, caching makes sense so the end user doesn t have to wait for physical I/O to complete in real time For a LOB that is 50MB in size, however, it probably does not make sense to have that in the cache Bear in mind that you can make excellent use of the Keep or Recycle pools (discussed in 4 Memory Structures ) here Instead of caching the LOBSEGMENT data in the default cache with all of the regular data, you can use the Keep or Recycle pools to separate it out.

The CommandBase class supports the creation of command objects. As discussed in 5, command objects allow you to write code that runs on the client, on the application server, and again on the client. This is the simplest of the base classes because all it needs to do is provide basic support for use of the data portal. The class is defined like this: <Serializable()> _ Public MustInherit Class CommandBase Inherits Core.MobileObject Implements Core.ICommandObject Implements Server.IDataPortalTarget End Class As with all base classes, it is Serializable and MustInherit. It implements several interfaces, most notably IDataPortalTarget, so the data portal can interact with the object as needed.

In that fashion, you can achieve the goal of caching LOB data without affecting the caching of existing data in your system..

And lastly, the CREATE TABLE statement returned from DBMS_METADATA previously included the following: LOB ("TXT") STORE AS BASICFILE ( STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)) That is, it had a full storage clause that you can use to control the physical storage characteristics. It should be noted that this storage clause applies to the LOBSEGMENT and the LOBINDEX equally a setting for one is used for the other. Assuming a locally-managed tablespace, the relevant settings for a LOB would be the FREELISTS, FREELIST GROUPS (when not using Automatic Segment Space Management as discussed in 10 Database Tables ), and BUFFER_POOL. We discussed the relevance of FREELISTS and FREELIST GROUPS in 10 in relation to table segments. The same rules apply to the LOBINDEX segment, as the LOBINDEX is managed the same as any other index segment. If you have highly concurrent modifications of LOBs, multiple FREELISTS on the index segment might be recommended. As mentioned in the previous section, using the Keep or Recycle pools for LOB segments can be a useful technique to allow you to cache LOB data, without damaging your existing default buffer cache. Rather than having the LOBs age out block buffers from normal tables, you can set aside a dedicated piece of memory in the SGA just for these objects. The BUFFER_POOL clause could be used to achieve that.

The last of the LOB types to talk about is the BFILE type. A BFILE type is simply a pointer to a file in the operating system. It is used to provide read-only access to these operating system files.

MobileObject exists to support serialization through the MobileFormatter, which is part of CSLA .NET for Silverlight. CSLA .NET for Silverlight is outside the scope of this book, and MobileObject has no impact on how CSLA .NET works within the .NET runtime.

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