1. Oracle Inter-Session
Communication
Oren Nakdimon
www.db-oriented.com
 oren@db-oriented.com
 +972-54-4393763
@DBoriented

2. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
http://db-oriented.com
Who Am
I?

3. INTER-SESSION COMMUNICATION

4. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session Session
Session

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Oren
Nakdimon
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Oren
Nakdimon
Session Session
Session

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Oren
Nakdimon
©
Oren
Nakdimon
Session
SGA
Session
Session

7. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
SGA
Session
Session

8. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox

9. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox

10. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
Outbox
SGA
Inbox
Session
Session
Outbox
Inbox Outbox
Inbox

11. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
Outbox
SGA
Session
Outbox
Inbox
Session
Inbox Outbox
Inbox
Outbox

12. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
Outbox
SGA
Session
Outbox
Inbox
Session
Inbox Outbox
Inbox
Outbox Inbox

13. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox

14. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox

15. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
Session
Session
Outbox
SGA
Session
Outbox
Inbox
Inbox Outbox
Outbox
Outbox Inbox

16. DEMO
Logger

17. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
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Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;

18. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;

19. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
end pipe_demo;

20. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;

21. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;

22. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;

23. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;
pack_message (number)
pack_message (varchar2)
pack_message (date)
pack_message_raw
pack_message_rowid

24. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
c_log_pipe constant varchar2(13) := 'DEMO_LOG_PIPE';
procedure log(i_text in varchar2) is
l_status number;
begin
dbms_pipe.pack_message(user);
dbms_pipe.pack_message(to_number(sys_context('userenv', 'sid')));
dbms_pipe.pack_message(sys_context('userenv', 'host'));
dbms_pipe.pack_message(sysdate);
dbms_pipe.pack_message(i_text);
l_status := dbms_pipe.send_message(c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.send_message failed with status ' || l_status);
end if;
end log;

25. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;

26. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;

27. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
) is
l_status number;
begin
l_status := dbms_pipe.receive_message(pipename => c_log_pipe);
if l_status != 0 then
raise_application_error(-20000,
'dbms_pipe.receive_message failed with status ' || l_status);
end if;
dbms_pipe.unpack_message(o_user);
dbms_pipe.unpack_message(o_sid);
dbms_pipe.unpack_message(o_host);
dbms_pipe.unpack_message(o_time);
dbms_pipe.unpack_message(o_text);
end get_next;
end pipe_demo;
unpack_message (number)
unpack_message (varchar2)
unpack_message (date)
unpack_message_raw
unpack_message_rowid

28. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}

29. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
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public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}

30. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}

31. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public class Logger {
public static void main(String args[]) throws SQLException {
Properties info = new Properties();
info.put(OracleConnection.CONNECTION_PROPERTY_USER_NAME, DB_USER);
info.put(OracleConnection.CONNECTION_PROPERTY_PASSWORD, DB_PASSWORD);
OracleDataSource ods = new OracleDataSource();
ods.setURL(DB_URL);
ods.setConnectionProperties(info);
try (OracleConnection connection = (OracleConnection) ods.getConnection()) {
DatabaseMetaData dbmd = connection.getMetaData();
System.out.println("Ready...");
System.out.println();
System.out.println("Time Host User SID Message");
System.out.println("--------------- -------------- ----- --- -------");
processRequests(connection);
System.out.println("Bye!");
System.out.println();
}
}

32. This presentation is available in http://db-oriented.com/presentations
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Nakdimon
©
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public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",

33. This presentation is available in http://db-oriented.com/presentations
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Oren
Nakdimon
©
Oren
Nakdimon
public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",

34. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
public static void processRequests(Connection connection) throws SQLException {
String user;
int sid;
String host;
Timestamp time;
String text = " ";
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",

35. This presentation is available in http://db-oriented.com/presentations
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©
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}

36. This presentation is available in http://db-oriented.com/presentations
©
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Nakdimon
©
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CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}

37. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}

38. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
CallableStatement callableStatement =
connection.prepareCall("{ call PIPE_DEMO.GET_NEXT(?,?,?,?,?) }");
callableStatement.registerOutParameter(1, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(2, java.sql.Types.INTEGER);
callableStatement.registerOutParameter(3, java.sql.Types.VARCHAR);
callableStatement.registerOutParameter(4, java.sql.Types.DATE);
callableStatement.registerOutParameter(5, java.sql.Types.VARCHAR);
do {
callableStatement.executeUpdate();
user = callableStatement.getString(1);
sid = callableStatement.getInt(2);
host = callableStatement.getString(3);
time = callableStatement.getTimestamp(4);
text = callableStatement.getString(5);
System.out.println(time + " " + host + " " + user + " " + String.format("%3s",
sid) + " " + text);
} while (!text.equals("ABORT"));
callableStatement.close();
}
}

39. PIPES
A Single Consumer

40. This presentation is available in http://db-oriented.com/presentations
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©
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SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox

41. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox

42. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox

43. PIPES
Multiple Consumers

44. This presentation is available in http://db-oriented.com/presentations
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Nakdimon
©
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Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox

45. DEMO
Multiple Consumers

46. This presentation is available in http://db-oriented.com/presentations
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©
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Nakdimon

47. This presentation is available in http://db-oriented.com/presentations
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Oren
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©
Oren
Nakdimon
create or replace package pipe_demo as
procedure log(i_text in varchar2);
procedure get_next
(
o_user out varchar2,
o_sid out number,
o_host out varchar2,
o_time out date,
o_text out varchar2
);
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
);
end pipe_demo;

48. This presentation is available in http://db-oriented.com/presentations
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©
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create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;

49. This presentation is available in http://db-oriented.com/presentations
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©
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create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;

50. ALERTS (SIGNALS)

51. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
Session
Session
Session
Session
Session
Session

52. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;

53. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;

54. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo;
There is also dbms_alert.waitany

55. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
create or replace package body pipe_demo as
...
procedure send_many_logs
(
i_text in varchar2,
i_how_many in binary_integer
) is
c_alert_name constant varchar2(10) := 'DEMO_ALERT';
l_message varchar2(100);
l_status number;
begin
dbms_alert.register(c_alert_name);
dbms_alert.waitone(c_alert_name, l_message, l_status);
for i in 1 .. i_how_many
loop
pipe_demo.log(i_text || '# ' || to_char(i));
end loop;
dbms_alert.remove(c_alert_name);
end send_many_logs;
end pipe_demo; There is also dbms_alert.removeall

56. PIPES
Request and Response

57. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox

58. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
SGA
Session
Inbox Outbox
Session
Inbox Outbox
Session
Inbox Outbox
dbms_pipe.unique_session_name

59. This presentation is available in http://db-oriented.com/presentations
©
Oren
Nakdimon
©
Oren
Nakdimon
DBMS_PIPE DBMS_ALERT
Type Named Pipes / Queue Signals / Broadcast
Implementation SGA structure Table
Transactional? Non-Transactional Transactional
Consumers of a specific
message
Single Consumer Zero-to-Multiple Consumers
Blocked Publisher? When pipe is full (“pipe put”
wait event)
When other session signaled
to the same alert and hasn’t
committed yet (TX lock), but
only if there are registered
consumers
Possible Loss of Messages? Instance crash/shutdown Multiple signals to the same
alert before read by the
consumer

60. THANK YOU
Oren Nakdimon
www.db-oriented.com
 oren@db-oriented.com
 +972-54-4393763
@DBoriented