Session properties
The default session properties are suitable for most c-treeDB applications. Advanced developers may need to tune c-treeDB to meet application requirements. Use ctdbSetSessionParams() to set the following properties:
Property
|
Description
|
Default
|
BUFS
|
Index file buffers
|
10
|
FILS
|
File structure blocks
|
32
|
SECT
|
Node sectors
|
32
|
DBUFS
|
Data file buffers
|
10
|
USERPROF
|
User profile mask
|
513
|
The default USERPROF value of 513 tells single-user, transaction-control applications, to remove the auxiliary log files S*.FCS and L*.FCS upon successful termination of the application, and also removes the automatic key transformation. The table below presents all possible values for the USERPROF parameter.
Keyword
|
Value
|
Explanation
|
USERPRF_NTKEY
|
1
|
Do not perform auto tfrmkey
|
USERPRF_SAVENV
|
2
|
Savenv mode for transactions
|
USERPRF_NDATA
|
32
|
Do not perform auto data - UNIFRMAT conversion
|
USERPRF_LOCLIB
|
64
|
Use a local library: not server
|
USERPRF_PTHTMP
|
128
|
Add tmpname to input path, otherwise use system tmpname
|
USERPRF_CODCNV
|
256
|
Auto language conversion
|
USERPRF_CLRCHK
|
512
|
Clear transaction logs
|
Example
/* setting different user profile before logging on to session */
ctdbSetSessionParam(hSession, USERPROF, (USERPRF_NTKEY | USERPROF_CLRCHK));
if (ctdbLogon(hSession, “FAIRCOMS”, “ADMIN”, “ADMIN) != CTDBRET_OK)
FatalError(“Session logon failed\n”);
|
