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Creates an index on a column.
VTCERR2 vtc_ensure_index ( PVCI2 pvci, char *column_name, unsigned short *outRc );
bool vts_multi.ensure_index ( int pvci, string column_name);
int Vtc.ensure_index ( long pvci, string column_name, OutIntParameter outRc);
|pvci||The server connection handle.|
|column_name||The name of the column to index.|
|outRc||The return status. 1 - Pass or 0 - Fail|
vtc_ensure_index creates a column index. If a column is not indexed, the time required to execute a vtc_send_if_unique call increases with the number of rows. If the column is indexed, the time for 'send if unique' operations is constant. For large databases, we recommend that you index columns you want to perform 'send if unique' operations.
A column is locked while an index is being built on it. Any function calls that change the column are queued until the index build completes.
If the index exists, this function has no effect.
C Language: Returns zero on success or one of the Error Codes.
C# Language: Returns true on success.
Java Language: Returns zero on success or one of the Error Codes.
int rc = 0; unsigned short outrc; PVCI2 pvci = 0; .... rc = vtc_ensure_index(pvci, "C_credit", &outrc); lr_log_message("ensure_index rc=%d\n", outrc);