Mega Code Archive

ANALYZE TABLE employee COMPUTE STATISTICS

SQL> SQL> create table employee( 2 emp_no integer primary key 3 ,lastname varchar2(20) not null 4 ,firstname varchar2(15) not null 5 ,midinit varchar2(1) 6 ,street varchar2(30) 7 ,city varchar2(20) 8 ,state varchar2(2) 9 ,zip varchar2(5) 10 ,zip_4 varchar2(4) 11 ,area_code varchar2(3) 12 ,phone varchar2(8) 13 ,salary number(3) 14 ,birthdate date 15 ,hiredate date 16 ,title varchar2(20) 17 ,dept_no integer 18 ,mgr integer 19 ,region number 20 ,division number 21 ,total_sales number 22 ); Table created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (1,'Anderson','Nancy','N','33 Ave','London','NY','11111','1111','212','234-1111',3.75,'21-mar-1927','1-feb-1947','Sales Manager',2,null,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (2,'Last','First','F','12 Ave','Paris','CA','22222','2222','221','867-2222',7.75,'14-feb-1976','15-mar-1985','Sales Clerk',2,1,100,10,10000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (3,'Wash','Georgia','G','1 Street14','Barton','NJ','33333','3333','214','340-3333',11.50,'2-jul-1977','21-apr-2004','Designer',1,2,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (4,'Bush','Dave','D','56 Street','Island','RI','44444','4444','215','777-4444',21.65,'15-may-1945','2-aug-1975','Designer',1,2,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (5,'Will','Robin','W','56 Street','Island','MA','55555','5555','216','777-5555',24.65,'10-dec-1980','2-aug-2007','Designer',1,5,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (6,'Pete','Mona','M','13 Ave','York','MO','66666','6666','217','111-6666',9,'14-feb-1966','15-mar-1985','Sales Clerk',2,5,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (7,'Roke','John','J','67 Ave','New York','BC','77777','7777','218','122-7777',10.00,'14-jun-1955','15-mar-1975','Accountant',3,2,100,10,40000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (8,'Horry','Tedi','T','1236 Lane','Newton','NY','88888','8888','219','222-8888',13.00,'10-jun-1955','15-aug-1985','Sales Representative',3,2,100,10,50000); 1 row created. SQL> insert into employee(emp_no, lastname, firstname, midinit, street, city, state, zip,zip_4, area_code, phone, salary, birthdate, hiredate,title, dept_no, mgr, region, division, total_sales) 2 values (9,'Bar','Candi','C','400 East Street','Yorken','NY','99999','9999','220','321-9999',12.00,'10-oct-1933','15-jan-1969','Sales Representative',3,5,100,10,35000); 1 row created. SQL> SQL> SQL> Set autotrace on SQL> SQL> SELECT region, SUM(total_sales) 2 FROM employee 3 GROUP BY region; REGION SUM(TOTAL_SALES) ---------- ---------------- 100 335000 1 row selected. Execution Plan ---------------------------------------------------------- Plan hash value: 1624656943 ------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 9 | 234 | 3 (34)| 00:00:01 | | 1 | HASH GROUP BY | | 9 | 234 | 3 (34)| 00:00:01 | | 2 | TABLE ACCESS FULL| EMPLOYEE | 9 | 234 | 2 (0)| 00:00:01 | ------------------------------------------------------------------------------- Note ----- - dynamic sampling used for this statement Statistics ---------------------------------------------------------- 48 recursive calls 0 db block gets 11 consistent gets 0 physical reads 0 redo size 479 bytes sent via SQL*Net to client 380 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 0 sorts (memory) 0 sorts (disk) 1 rows processed SQL> SQL> set autotrace off SQL> SQL> ANALYZE TABLE employee COMPUTE STATISTICS; Table analyzed. SQL> SQL> drop table employee; Table dropped. SQL> --