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Server Settings section 11

The following table compares these storage options:

Migrating client variable data

To migrate your client variable data to another data source, you should know the

structure of the database tables that store this information. Client variables stored

externally use two small database tables, like those shown in the following tables:

Storage type Advantages Disadvantages

Data source

• Can use existing data

source

• Portable: not tied to the

host system or operating

system

• Requires database transaction to

read/write variables

• More complex to implement

Browser cookies

• Simple implementation

• Good performance

• Can be set to expire

automatically

• Client-side control

• Users can configure browsers to

disallow cookies

• ColdFusion MX limits a cookie’s

data to 4 KB

• Netscape Navigator allows only 20

cookies from one host; ColdFusion

MX uses three cookies to store

read-only data, leaving only 17

cookies available

System registry

• Simple implementation

• Good performance

• Registry can be exported

easily to other systems

• Server-side control

• Possible restriction of the registry’s

maximum size limit on Windows in

the Control Panel

• Integrated with the host system: not

practical for clustered servers

• Solaris, Linux, and HP-UX registries

are text files. Their registries deliver

slow performance and low

scalability.

CDATA Table

Column Data type

cfid CHAR(64), TEXT, VARCHAR, or equivalent

app CHAR(64), TEXT, VARCHAR, or equivalent

data MEMO, LONGTEXT, LONG VARCHAR, or equivalent

CGLOBAL Table

Column Data type

cfid CHAR(64), TEXT, VARCHAR, or equivalent

data MEMO, LONGTEXT, LONG VARCHAR, or equivalent

lvisit TIMESTAMP, DATETIME, DATE, or equivalent

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 67 68

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