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This example demonstrates creation of ISAM files supporting 8-byte file addresses. For simplicity, it uses a single data file with a single index with a single segment.
/* define extended file attributes */
XCREblk creblks[2] = {
{ ctFILEPOS8, /* x8mode: support HUGE data file */
0, 0, 0, 0,
1048576}, /* lxtsiz: 1MB file extensions */
{ ctFILEPOS8, /* x8mode: support HUGE index file */
0, 0, 0, 0,
1048576} /* lxtsiz: 1MB file extensions */
};
/* define ISAM attributes */
ISEG seg = { 4, 6, 0};
IIDX idx = { 14, 4, 1, 0, 0, 1, &seg};
/* Note that the segment is 6 bytes, but the key allows
* duplicates, so the key length is 14, allowing 8 bytes
* for the offset tiebreaker.
*/
IFIL fil = { "bigdata", -1, 128, 0,
ctSHARED | ctVLENGTH | ctTRNLOG, 1, 0,
ctSHARED | ctVIRTUAL | ctTRNLOG, &idx};
InitISAM(10,5,32); /* Initialize c-tree */
/* create HUGE ISAM files */
CreateIFileXtd8( &fil, NULL, NULL, 0L, NULL, NULL,
creblks /* pointer to array of XCREblks */
);
CloseIFile(&fil);
OpenIFileXtd(&fil,NULL,NULL,NULL);
CloseISAM();
/* Note the use of standard c-tree API functions after the
* initial creation of the file. The file type is invisible to
* the application unless low level calls are used or an
* explicit reference is made to a file offset.
*/
