db2isolationlevels.out

derby database source code.good for you.

ij> set current isolation = reset;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----
ij> -- verify SET ISOLATION commits and changes isolation level
set current isolation = RS;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----
RS  
ij> -- rollback should find nothing to undo
rollback;
ij> select * from t1;
C1         
-----------
1          
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name: 
	null
Statement Text: 
	select * from t1
Parse Time: 0
Bind Time: 0
Optimize Time: 0
Generate Time: 0
Compile Time: 0
Execute Time: 0
Begin Compilation Timestamp : null
End Compilation Timestamp : null
Begin Execution Timestamp : null
End Execution Timestamp : null
Statement Execution Plan Text: 
Index Scan ResultSet for T1 using constraint ASDF at repeatable read isolation level using share row locking chosen by the optimizer
Number of opens = 1
Rows seen = 1
Rows filtered = 0
Fetch Size = 16
	constructor time (milliseconds) = 0
	open time (milliseconds) = 0
	next time (milliseconds) = 0
	close time (milliseconds) = 0
	next time in milliseconds/row = 0
scan information: 
	Bit set of columns fetched={0}
	Number of columns fetched=1
	Number of deleted rows visited=0
	Number of pages visited=1
	Number of rows qualified=1
	Number of rows visited=1
	Scan type=btree
	Tree height=1
	start position: 
	None
	stop position: 
	None
	qualifiers:
None
ij> set isolation to reset;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----
ij> -- verify SET ISOLATION commits and changes isolation level
set isolation = dirty read;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----
UR  
ij> -- rollback should find nothing to undo
rollback;
ij> select * from t1;
C1         
-----------
1          
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name: 
	null
Statement Text: 
	select * from t1
Parse Time: 0
Bind Time: 0
Optimize Time: 0
Generate Time: 0
Compile Time: 0
Execute Time: 0
Begin Compilation Timestamp : null
End Compilation Timestamp : null
Begin Execution Timestamp : null
End Execution Timestamp : null
Statement Execution Plan Text: 
Index Scan ResultSet for T1 using constraint ASDF at read uncommitted isolation level using share row locking chosen by the optimizer
Number of opens = 1
Rows seen = 1
Rows filtered = 0
Fetch Size = 16
	constructor time (milliseconds) = 0
	open time (milliseconds) = 0
	next time (milliseconds) = 0
	close time (milliseconds) = 0
	next time in milliseconds/row = 0
scan information: 
	Bit set of columns fetched={0}
	Number of columns fetched=1
	Number of deleted rows visited=0
	Number of pages visited=1
	Number of rows qualified=1
	Number of rows visited=1
	Scan type=btree
	Tree height=1
	start position: 
	None
	stop position: 
	None
	qualifiers:
None
ij> -- test WITH ISOLATION clause
set isolation serializable;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----
RR  
ij> select * from t1 with CS;
C1         
-----------
1          
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name: 
	null
Statement Text: 
	select * from t1 with CS
Parse Time: 0
Bind Time: 0
Optimize Time: 0
Generate Time: 0
Compile Time: 0
Execute Time: 0
Begin Compilation Timestamp : null
End Compilation Timestamp : null
Begin Execution Timestamp : null
End Execution Timestamp : null
Statement Execution Plan Text: 
Index Scan ResultSet for T1 using constraint ASDF at read committed isolation level using instantaneous share row locking chosen by the optimizer
Number of opens = 1
Rows seen = 1
Rows filtered = 0
Fetch Size = 16
	constructor time (milliseconds) = 0
	open time (milliseconds) = 0
	next time (milliseconds) = 0
	close time (milliseconds) = 0
	next time in milliseconds/row = 0
scan information: 
	Bit set of columns fetched={0}
	Number of columns fetched=1
	Number of deleted rows visited=0
	Number of pages visited=1
	Number of rows qualified=1
	Number of rows visited=1
	Scan type=btree
	Tree height=1
	start position: 
	None
	stop position: 
	None
	qualifiers:
None
ij> set isolation cursor stability;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1   
----