Top Ten (10) SQL Statements in Oracle Database

Here is a simple recipe. The following SQL finds the top ten SQL statements with the greatest elapsed time.

SELECT sql_id, child_number, sql_text, elapsed_time

  FROM (SELECT sql_id,

               child_number,

               sql_text,

               elapsed_time,

               cpu_time,

               disk_reads,

               RANK() OVER(ORDER BY elapsed_time DESC) AS elapsed_rank

          FROM v$sql)

 WHERE elapsed_rank <= 10;

Count Number of Rows in All User Tables in Oracle Database using PL/SQL

With this recipe you can count the number of rows for ALL tables in current Oracle Database schema.

DECLARE

  t_c1_tname      user_tables.table_name%TYPE;

  t_command       VARCHAR2(200);

  t_cid           INTEGER;

  t_total_records NUMBER(10);

  stat            INTEGER;

  row_count       INTEGER;

  t_limit         INTEGER := 0;    -- Only show tables with more rows

  CURSOR c1 IS SELECT table_name FROM user_tables ORDER BY table_name;

BEGIN

  t_limit := 0;

  OPEN c1;

  LOOP

        FETCH c1 INTO t_c1_tname;

        EXIT WHEN c1%NOTFOUND;

        t_command := 'SELECT COUNT(0) FROM '||t_c1_tname;

        t_cid := DBMS_SQL.OPEN_CURSOR;

        DBMS_SQL.PARSE(t_cid,t_command,DBMS_SQL.native);

        DBMS_SQL.DEFINE_COLUMN(t_cid,1,t_total_records);

        stat := DBMS_SQL.EXECUTE(t_cid);

        row_count := DBMS_SQL.FETCH_ROWS(t_cid);

        DBMS_SQL.COLUMN_VALUE(t_cid,1,t_total_records);

        IF t_total_records > t_limit THEN

                DBMS_OUTPUT.PUT_LINE(RPAD(t_c1_tname,55,' ')||

                        TO_CHAR(t_total_records,'99999999')||' record(s)');

 

        END IF;

        DBMS_SQL.CLOSE_CURSOR(t_cid);

  END LOOP;

  CLOSE c1;

END;