text: /*
  ** 2014 December 9
  **
  ** The author disclaims copyright to this source code.  In place of
  ** a legal notice, here is a blessing:
  **
  **    May you do good and not evil.
  **    May you find forgiveness for yourself and forgive others.
  **    May you share freely, never taking more than you give.
  **
  *************************************************************************
  **
  **     create_drop_index_1
  */
  
  
  static char *create_drop_index_thread(int iTid, int iArg){
    Error err = {0};                /* Error code and message */
    Sqlite db = {0};                /* SQLite database connection */
  
    while( !timetostop(&err) ){
      opendb(&err, &db, "test.db", 0);
  
      sql_script(&err, &db, 
  
        "DROP INDEX IF EXISTS i1;"
        "DROP INDEX IF EXISTS i2;"
        "DROP INDEX IF EXISTS i3;"
        "DROP INDEX IF EXISTS i4;"
  
        "CREATE INDEX IF NOT EXISTS i1 ON t1(a);"
        "CREATE INDEX IF NOT EXISTS i2 ON t1(b);"
        "CREATE INDEX IF NOT EXISTS i3 ON t1(c);"
        "CREATE INDEX IF NOT EXISTS i4 ON t1(d);"
  
        "SELECT * FROM t1 ORDER BY a;"
        "SELECT * FROM t1 ORDER BY b;"
        "SELECT * FROM t1 ORDER BY c;"
        "SELECT * FROM t1 ORDER BY d;"
      );
  
      closedb(&err, &db);
    }
  
    print_and_free_err(&err);
    return sqlite3_mprintf("ok");
  }
  
  static void create_drop_index_1(int nMs){
    Error err = {0};
    Sqlite db = {0};
    Threadset threads = {0};
  
    opendb(&err, &db, "test.db", 1);
    sql_script(&err, &db, 
       "CREATE TABLE t1(a, b, c, d);"
       "WITH data(x) AS (SELECT 1 UNION ALL SELECT x+1 FROM data WHERE x<100) "
       "INSERT INTO t1 SELECT x,x,x,x FROM data;"
    );
    closedb(&err, &db);
  
    setstoptime(&err, nMs);
  
    sqlite3_enable_shared_cache(1);
    launch_thread(&err, &threads, create_drop_index_thread, 0);
    launch_thread(&err, &threads, create_drop_index_thread, 0);
    launch_thread(&err, &threads, create_drop_index_thread, 0);
    launch_thread(&err, &threads, create_drop_index_thread, 0);
    launch_thread(&err, &threads, create_drop_index_thread, 0);
    sqlite3_enable_shared_cache(0);
  
    join_all_threads(&err, &threads);
    print_and_free_err(&err);
  }
  