Finish exmaples closes[t:1904]

git-svn-id: file:///svn/toku/tokudb@13651 c7de825b-a66e-492c-adef-691d508d4ae1

release/examples/Makefile

@@ -5,7 +5,7 @@ CPPFLAGS = -I./include
 LDFLAGS = -L.. -lfractaltreeindex -Wl,-rpath,..
 db-insert-bdb: db-insert.c
 	cc -ldb db-insert.c  -o db-insert-bdb -DBDB $(CFLAGS)
-db-scan-bdb: db-insert.c
+db-scan-bdb: db-scan.c
 	cc -ldb db-scan.c    -o db-scan-bdb   -DBDB $(CFLAGS)
 default: db-insert
 

release/examples/README.examples

@@ -45,4 +45,22 @@ $ ls -lh bench.bdb/
 total 322M
 -rw-r--r-- 1 bradley bradley 322M 2009-07-28 16:14 bench.db
 
+When scanning the table, one can run out of locks with BDB.  There are ways around it (increase the lock table size).
+
+$ ./db-scan-bdb
+Lock table is out of available object entries
+db-scan-bdb: db-scan.c:177: scanscan_hwc: Assertion `r==(-30988)' failed.
+Aborted
+
+TokuDB is fine on a big table scan.
+
+$ ./db-scan
+Scan    33162304 bytes (2072644 rows) in  7.924463s at  4.184801MB/s
+Scan    33162304 bytes (2072644 rows) in  3.062239s at 10.829431MB/s
+0:3 1:53 2:56 
+miss=3 hit=53 wait_reading=0 wait=0
+VmPeak:	  244668 kB
+VmHWM:	   68096 kB
+VmRSS:	    1232 kB
+
 There isn't much documentation for the Tokutek Fractal Tree index library, but most of the API is like Berkeley DB's.

release/examples/db-scan.c

@@ -167,10 +167,14 @@ static void scanscan_hwc (void) {
             c_get_flags |= lock_flag;
         }
 	while (0 == (r = dbc->c_get(dbc, &k, &v, c_get_flags))) {
+	    
+	    //printf("r=%d\n", r);
+
 	    totalbytes += k.size + v.size;
 	    rowcounter++;
 	    if (limitcount>0 && rowcounter>=limitcount) break;
 	}
+	assert(r==DB_NOTFOUND);
 	r = dbc->c_close(dbc);                                      assert(r==0);
 	double thistime = gettime();
 	double tdiff = thistime-prevtime;