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|
ij> --
-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements. See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License. You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
--
-- single user test for the various isolation levels
prepare getIsolation as 'values current isolation';
ij> autocommit off;
ij> call SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1);
0 rows inserted/updated/deleted
ij> maximumdisplaywidth 2000;
ij> -- create a table
create table t1(c1 int not null constraint asdf primary key);
0 rows inserted/updated/deleted
ij> commit;
ij> -- insert a row
insert into t1 values 1;
1 row inserted/updated/deleted
ij> -- verify table scan gets row lock at read committed
select * from t1;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
-- verify table scan gets row lock at read committed
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 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> -- verify matching index scan gets row lock at read committed
select * from t1 where c1 = 1;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
-- verify matching index scan gets row lock at read committed
select * from t1 where c1 = 1
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 share row locking chosen by the optimizer
Number of opens = 1
Rows seen = 1
Rows filtered = 0
Fetch Size = 1
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:
>= on first 1 column(s).
Ordered null semantics on the following columns:
0
stop position:
> on first 1 column(s).
Ordered null semantics on the following columns:
0
qualifiers:
None
ij> -- verify WITH clause works
select * from t1 with rr;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
-- verify WITH clause works
select * from t1 with rr
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 serializable isolation level using share table 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> -- verify SET ISOLATION commits and changes isolation level
set isolation RR;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1
----
RR
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 serializable isolation level using share table 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 reset;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1
----
ij> -- verify matching index scan gets row lock at read committed
select * from t1 where c1 = 1;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
-- verify matching index scan gets row lock at read committed
select * from t1 where c1 = 1
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 share row locking chosen by the optimizer
Number of opens = 1
Rows seen = 1
Rows filtered = 0
Fetch Size = 1
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:
>= on first 1 column(s).
Ordered null semantics on the following columns:
0
stop position:
> on first 1 column(s).
Ordered null semantics on the following columns:
0
qualifiers:
None
ij> -- verify SET ISOLATION commits and changes isolation level
set isolation read committed;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1
----
CS
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 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 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 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
----
CS
ij> select * from t1 with RR;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
select * from t1 with RR
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 serializable isolation level using share table 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 serializable;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1
----
RR
ij> select * from t1 with RS;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
select * from t1 with RS
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 current isolation to read committed;
0 rows inserted/updated/deleted
ij> execute getIsolation;
1
----
CS
ij> select * from t1 with ur;
C1
-----------
1
ij> values SYSCS_UTIL.SYSCS_GET_RUNTIMESTATISTICS();
1
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Statement Name:
null
Statement Text:
select * from t1 with ur
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> -- unknown isolation level
select * from t1 with rw;
ERROR 42X01: Syntax error: Encountered "rw" at line 2, column 23.
Issue the 'help' command for general information on IJ command syntax.
Any unrecognized commands are treated as potential SQL commands and executed directly.
Consult your DBMS server reference documentation for details of the SQL syntax supported by your server.
ij> -- check the db2 isolation levels can be used as identifiers
create table db2iso(cs int, rr int, ur int, rs int);
0 rows inserted/updated/deleted
ij> select cs, rr, ur, rs from db2iso;
CS |RR |UR |RS
-----------------------------------------------
ij> -- cleanup
drop table t1;
0 rows inserted/updated/deleted
ij>
|
