Huge File Creation Example

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 Plus         */

/* 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 Plus 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.  

 */