IBM DB2 Manual page 251

false The application cannot contain delimited SQL identifiers. Double
quotation marks (") or single quotation marks (') delimit literal strings.
This is the default.
true The application can contain delimited SQL identifiers. Delimited SQL
identifiers must be enclosed in double quotation marks ("). Single
quotation marks (') delimit literal strings.
IFX_DIRECTIVES
Specifies whether the optimizer allows query optimization directives from
within a query. The data type of this property is String. Possible values are:
"1" or "ON"
Optimization directives are accepted.
"0" or "OFF"
Optimization directives are not accepted.
If this property is not set, no value is sent to the server. The value for the
IFX_DIRECTIVES environment variable is used.
IFX_EXTDIRECTIVES
Specifies whether the optimizer allows external query optimization directives
from the sysdirectives system catalog table to be applied to queries in existing
applications. Possible values are:
"1" or "ON"
External query optimization directives are accepted.
"0" or "OFF"
External query optimization are not accepted.
If this property is not set, no value is sent to the server. The value for the
IFX_EXTDIRECTIVES environment variable is used.
IFX_UPDDESC
Specifies whether a DESCRIBE of an UPDATE statement is permitted. The data
type of this property is String.
Any non-null value indicates that a DESCRIBE of an UPDATE statement is
permitted. The default is "1".
IFX_XASTDCOMPLIANCE_XAEND
Specifies whether global transactions are freed only after an explicit rollback, or
after any rollback. The data type of this property is String. Possible values are:
"0"
Global transactions are freed only after an explicit rollback. This
behavior conforms to the X/Open XA standard.
"1"
Global transactions are freed after any rollback.
If this property is not set, no value is sent to the server. The value for the
IFX_XASTDCOMPLIANCE_XAEND environment variable is used.
INFORMIXOPCACHE
Specifies the size of the memory cache, in kilobytes, for the staging-area
blobspace of the client application. The data type of this property is String. A
value of "0" indicates that the cache is not used.
If this property is not set, no value is sent to the server. The value for the
INFORMIXOPCACHE environment variable is used.
INFORMIXSTACKSIZE
Specifies the stack size, in kilobytes, that the database server uses for the
primary thread of a client session. The data type of this property is String.
Chapter 7. JDBC and SQLJ reference information
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