в 13:45, 26 мая 2010

2010-05-26T13:45:19Z

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2010-05-26T09:54:52Z

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==alter rollback segment SEGMENT_NAME online==



<source lang="sql">

SQL> alter rollback segment SEGMENT_NAME online;
SQL>
SQL>
SQL> commit;
SQL>
SQL>

</source>

==atomicity: roll back and commit==



<source lang="sql">

SQL>
SQL>
SQL> create table t ( x number(1) );
Table created.
SQL> /
SQL> insert into t values ( 1 );
1 row created.
SQL> insert into t values ( 2 );
1 row created.
SQL> /
1 row created.
SQL> rollback;
Rollback complete.
SQL> select * from t;
no rows selected
SQL> insert into t values ( 1 );
1 row created.
SQL> insert into t values ( 2 );
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t;
X
----------
1
2
SQL> /
X
----------
1
2
SQL>
SQL> drop table t;
Table dropped.

</source>

==Rollback a delete==



<source lang="sql">

SQL>
SQL> -- create demo table
SQL> create table Employee(
2 ID VARCHAR2(4 BYTE) NOT NULL,
3 First_Name VARCHAR2(10 BYTE),
4 Last_Name VARCHAR2(10 BYTE),
5 Start_Date DATE,
6 End_Date DATE,
7 Salary Number(8,2),
8 City VARCHAR2(10 BYTE),
9 Description VARCHAR2(15 BYTE)
10 )
11 /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values ("01","Jason", "Martin", to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto", "Programmer")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("02","Alison", "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("03","James", "Smith", to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("04","Celia", "Rice", to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("05","Robert", "Black", to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("06","Linda", "Green", to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York", "Tester")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("07","David", "Larry", to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York", "Manager")
3 /
1 row created.
SQL> insert into Employee(ID, First_Name, Last_Name, Start_Date, End_Date, Salary, City, Description)
2 values("08","James", "Cat", to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
3 /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
2 /
ID FIRST_NAME LAST_NAME START_DAT END_DATE SALARY CITY DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01 Jason Martin 25-JUL-96 25-JUL-06 1234.56 Toronto Programmer
02 Alison Mathews 21-MAR-76 21-FEB-86 6661.78 Vancouver Tester
03 James Smith 12-DEC-78 15-MAR-90 6544.78 Vancouver Tester
04 Celia Rice 24-OCT-82 21-APR-99 2344.78 Vancouver Manager
05 Robert Black 15-JAN-84 08-AUG-98 2334.78 Vancouver Tester
06 Linda Green 30-JUL-87 04-JAN-96 4322.78 New York Tester
07 David Larry 31-DEC-90 12-FEB-98 7897.78 New York Manager
08 James Cat 17-SEP-96 15-APR-02 1232.78 Vancouver Tester
8 rows selected.
SQL>
SQL> delete from Employee where id = "01";
1 row deleted.
SQL>
SQL> select id, last_name from Employee where id = "01";
no rows selected
SQL>
SQL> rollback;
Rollback complete.
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
2 /
Table dropped.
SQL>
SQL>
SQL>

</source>

==Rollback to savepoint in exception handler==



<source lang="sql">

SQL>
SQL> create table myTable2 ( cnt int );
Table created.
SQL>
SQL> insert into myTable2 values ( 0 );
1 row created.
SQL>
SQL> create table t ( x int check ( x>0 ) );
Table created.
SQL>
SQL> create trigger t_trigger before insert or delete on t for each row
2 begin
3 if ( inserting ) then
4 update myTable2 set cnt = cnt +1;
5 else
6 update myTable2 set cnt = cnt -1;
7 end if;
8 dbms_output.put_line( "fired and updated " || sql%rowcount || " rows" );
9 end;
10 /
Trigger created.
SQL>
SQL> create or replace procedure p
2 as
3 begin
4 insert into t values ( 1 );
5 insert into t values (-1 );
6 end;
7 /
Procedure created.
SQL> select * from t;
no rows selected
SQL> select * from myTable2;
CNT
----------
0
SQL> begin
2 p;
3 end;
4 /
fired and updated 1 rows
fired and updated 1 rows
begin
*
ERROR at line 1:
ORA-02290: check constraint (sqle.SYS_C0010265) violated
ORA-06512: at "sqle.P", line 5
ORA-06512: at line 2

SQL> select * from t;
no rows selected
SQL> select * from myTable2;
CNT
----------
0
SQL>
SQL>
SQL> begin
2 p;
3 exception
4 when others then null;
5 end;
6 /
fired and updated 1 rows
fired and updated 1 rows
PL/SQL procedure successfully completed.
SQL> select * from t;
X
----------
1
SQL> select * from myTable2;
CNT
----------
1
SQL>
SQL> rollback;
Rollback complete.
SQL>
SQL> begin
2 savepoint sp;
3 p;
4 exception
5 when others then
6 rollback to sp;
7 end;
8 /
fired and updated 1 rows
fired and updated 1 rows
PL/SQL procedure successfully completed.
SQL> select * from t;
no rows selected
SQL> select * from myTable2;
CNT
----------
0
SQL>
SQL>
SQL>
SQL> drop table t;
Table dropped.
SQL> drop table myTable2;
Table dropped.

</source>

==SET TRANSACTION READ WRITE==



<source lang="sql">

SQL> CREATE TABLE project (
2 pro_id NUMBER(4),
3 pro_name VARCHAR2(40),
4 budget NUMBER(9,2),
5 CONSTRAINT project_pk PRIMARY KEY (pro_id)
6 );
Table created.
SQL>
SQL>
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1001, "A",12345);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1002, "ERP",23456);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1003, "SQL",34567);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1004, "CRM",45678);
1 row created.
SQL> INSERT INTO project(pro_id, pro_name, budget)VALUES (1005, "VPN",56789);
1 row created.
SQL>
SQL>
SQL> CREATE TABLE server_usage (
2 pro_id NUMBER(4),
3 emp_id NUMBER,
4 time_log_date DATE,
5 hours_logged NUMBER(8,2),
6 dollars_charged NUMBER(8,2),
7 CONSTRAINT server_usage_pk PRIMARY KEY (pro_id, emp_id, time_log_date)
8 );
Table created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,101,to_date("4-Apr-2004","dd-mon-yyyy"),1123,222);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,102,to_date("4-Apr-2005","dd-mon-yyyy"),1124,223);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1003,103,to_date("4-Apr-2006","dd-mon-yyyy"),1125,224);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1004,104,to_date("4-Apr-2007","dd-mon-yyyy"),1126,225);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1005,105,to_date("4-Apr-2008","dd-mon-yyyy"),1127,226);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1001,106,to_date("4-Apr-2009","dd-mon-yyyy"),1128,227);
1 row created.
SQL> INSERT INTO server_usage(pro_id, emp_id, time_log_date, hours_logged, dollars_charged)
2 VALUES (1002,107,to_date("4-Apr-2010","dd-mon-yyyy"),1129,228);
1 row created.
SQL> SET ECHO ON
SQL>
SQL> SET TRANSACTION READ WRITE;
SQL>
SQL>
SQL> INSERT INTO project
2 SELECT 2008, pro_name, budget FROM project
3 WHERE pro_id = 1002;
1 row created.
SQL>
SQL>
SQL> UPDATE server_usage
2 SET pro_id = 2008
3 WHERE pro_id = 1002;
2 rows updated.
SQL>
SQL>
SQL> ROLLBACK;
Rollback complete.
SQL>
SQL>
SQL> drop table project;
Table dropped.
SQL> drop table server_usage;
Table dropped.

</source>

==set transaction use rollback segment SEGMENT_NAME==



<source lang="sql">

SQL> set transaction use rollback segment SEGMENT_NAME
2 /

</source>

==show autocommit==



<source lang="sql">

SQL>
SQL> set autocommit on
SQL> show autocommit
autocommit IMMEDIATE
SQL> set autocommit 42
SQL> show autocommit
AUTOCOMMIT ON for every 42 DML statements
SQL> set autocommit off
SQL>
SQL>

</source>

==TRANSACTION CONTROL==



<source lang="sql">

SQL>
SQL> CREATE TABLE purchase (
2 product_name VARCHAR2(25),
3 quantity NUMBER(4,2),
4 purchase_date DATE,
5 salesperson VARCHAR2(3)
6 );
Table created.
SQL>
SQL>
SQL> INSERT INTO purchase VALUES ("Small Widget", 1, "14-JUL-03", "CA");
1 row created.
SQL> INSERT INTO purchase VALUES ("Medium Widget", 75, "14-JUL-03", "BB");
1 row created.
SQL>
SQL>
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
Medium Widget 75 14-JUL-03 BB
SQL>
SQL> ROLLBACK;
Rollback complete.
SQL>
SQL> SELECT * FROM purchase;
no rows selected
SQL>
SQL>
SQL> INSERT INTO purchase VALUES ("Small Widget", 1, "14-JUL-03", "CA");
1 row created.
SQL> SAVEPOINT a;
Savepoint created.
SQL> INSERT INTO purchase VALUES ("Medium Widget", 75, "14-JUL-03", "BB");
1 row created.
SQL> SAVEPOINT sp_2;
Savepoint created.
SQL> INSERT INTO purchase VALUES ("Product Number", 2, "14-JUL-03", "GA");
1 row created.
SQL> SAVEPOINT third;
Savepoint created.
SQL> INSERT INTO purchase VALUES ("Small Widget", 8, "15-JUL-03", "GA");
1 row created.
SQL> SAVEPOINT final_sp;
Savepoint created.
SQL> INSERT INTO purchase VALUES ("Medium Widget", 20, "15-JUL-03", "LB");
1 row created.
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
Medium Widget 75 14-JUL-03 BB
Product Number 2 14-JUL-03 GA
Small Widget 8 15-JUL-03 GA
Medium Widget 20 15-JUL-03 LB
SQL> ROLLBACK TO final_sp;
Rollback complete.
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
Medium Widget 75 14-JUL-03 BB
Product Number 2 14-JUL-03 GA
Small Widget 8 15-JUL-03 GA
SQL> ROLLBACK TO third;
Rollback complete.
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
Medium Widget 75 14-JUL-03 BB
Product Number 2 14-JUL-03 GA
SQL> ROLLBACK TO sp_2;
Rollback complete.
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
Medium Widget 75 14-JUL-03 BB
SQL> ROLLBACK TO a;
Rollback complete.
SQL> SELECT * FROM purchase;
PRODUCT_NAME QUANTITY PURCHASE_ SAL
------------------------- ---------- --------- ---
Small Widget 1 14-JUL-03 CA
SQL> ROLLBACK;
Rollback complete.
SQL> SELECT * FROM purchase;
no rows selected
SQL>
SQL>
SQL> drop table purchase;
Table dropped.

</source>

==Transaction Rollback and commit==



<source lang="sql">

SQL>
SQL> -- rollback and commit
SQL>
SQL> create table t ( x number(1) );
Table created.
SQL>
SQL>
SQL> insert into t values ( 1 );
1 row created.
SQL> insert into t values ( 2 );
1 row created.
SQL>
SQL> rollback;
Rollback complete.
SQL> select * from t;
no rows selected
SQL> insert into t values ( 1 );
1 row created.
SQL> insert into t values ( 2 );
1 row created.
SQL> commit;
Commit complete.
SQL> select * from t;
X
----------
1
2
SQL>
SQL> drop table t;
Table dropped.
SQL>
SQL>
SQL>

</source>

==Transactions and Error Handling==



<source lang="sql">

SQL>
SQL> CREATE TABLE emp (
2 empID INT NOT NULL PRIMARY KEY,
3 Name VARCHAR(50) NOT NULL);
Table created.
SQL> INSERT INTO emp (empID,Name) VALUES (1,"Tom");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (2,"Jack");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (3,"Mary");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (4,"Bill");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (5,"Cat");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (6,"Victor");
1 row created.
SQL> BEGIN
2
3 INSERT INTO emp (empID, Name) VALUES (101, "sqle");
4 INSERT INTO emp (empID, Name) VALUES (102, "Claire");
5
6 SAVEPOINT BeforeAddingAnne;
7 INSERT INTO emp (empID, Name) VALUES (103, "Anne");
8 ROLLBACK TO BeforeAddingAnne;
9
10 COMMIT;
11
12 EXCEPTION
13 WHEN OTHERS
14 THEN ROLLBACK;
15 END;
16 /
PL/SQL procedure successfully completed.
SQL>
SQL>
SQL> drop table emp;
Table dropped.

</source>

==Transactions and Savepoints==



<source lang="sql">

SQL>
SQL>
SQL> CREATE TABLE emp (
2 empID INT NOT NULL PRIMARY KEY,
3 Name VARCHAR(50) NOT NULL);
Table created.
SQL> INSERT INTO emp (empID,Name) VALUES (1,"Tom");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (2,"Jack");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (3,"Mary");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (4,"Bill");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (5,"Cat");
1 row created.
SQL> INSERT INTO emp (empID,Name) VALUES (6,"Victor");
1 row created.
SQL>
SQL> SAVEPOINT BeforeAddingBademp;
Savepoint created.
SQL> INSERT INTO emp (empID, Name) VALUES (99, "Bad emp");
1 row created.
SQL> ROLLBACK TO BeforeAddingBademp;
Rollback complete.
SQL>
SQL> COMMIT;
Commit complete.
SQL>
SQL>
SQL>
SQL> drop table emp;
Table dropped.

</source>

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Oracle PL/SQL/Table/Transaction Rollback Commit - История изменений

в 13:45, 26 мая 2010

Admin: 1 версия