name changes

oamapps/columnstoreSupport/approximateRowCount.sh

@@ -0,0 +1,62 @@
+#!/bin/bash
+
+#
+# Estimates the row count for a given table.  Uses number of extents * 8M for the estimate.
+#
+
+#
+# Initialize variables.
+#
+
+if [ -z "$MYSQLCMD" ]; then
+	INSTALLDIR="/usr/local/MariaDB/Columnstore"
+	MYSQLCNF=$INSTALLDIR/mysql/my.cnf
+	MYSQLCMD="$INSTALLDIR/mysql/bin/mysql --defaults-file=$MYSQLCNF -u root"
+fi
+
+#
+# Validate that there are two parameters - schema and table.
+#
+if [ $# -ne 2 ]; then
+	echo ""
+	echo "Reports the approximate row count for the given table."
+	echo ""
+	echo "Parameters:"
+	echo "	Schema"
+	echo "	Table"
+fi
+db=$1
+table=$2
+
+#
+# Validate that the table exists.
+#
+sql="select count(*) from systable where \`schema\`='$db' and tablename='$table';"
+count=`$MYSQLCMD columnstoresys --skip-column-names -e "$sql;"`
+if [ $count -le 0 ]; then
+	echo ""
+	echo "$db.$table does not exist in Columnstore."
+	echo ""
+	exit 1
+fi
+
+#
+# Grab the objectid and column width for a column in the table.
+#
+sql="select objectid from syscolumn where \`schema\`='$db' and tablename='$table' limit 1;" 
+objectid=`$MYSQLCMD columnstoresys --skip-column-names -e "$sql"`
+sql="select columnlength from syscolumn where objectid=$objectid;"
+colWidth=`$MYSQLCMD columnstoresys --skip-column-names -e "$sql"`
+
+#
+# Use editem to count the extents.
+#
+extentCount=`/usr/local/MariaDB/Columnstore/bin/editem -o $objectid | wc -l`
+let extentCount-=2 # Take out the 2 extra rows for header and blank line at end.
+let approximateRowCount=$extentCount*8192*1024;
+
+echo ""
+echo "Approximate row count for $db.$table is $approximateRowCount."
+echo ""
+
+exit 0