Parade: PARallel Active Database Engine

Go to the directory of client for nCUBE

sun3> cd ncube/client

Execute client

sun3> ./sqlclt server: ncube port: 12345 echo: off

Commands accepted by SQL client

start transaction

commit transaction

rollback transaction

abortall transaction

create table "TABLE"

attribute("ATTNAME", ATTNUNBER, "TYPE", LENGTH)

primary_key("TYPE", NUMBER)

partitions("TYPE", "DISK")

parallel_disk({DISK_NUMBER, DISKDIROFROOT, DISKDIROFLEAF...})

page(PAGESIZE(K), MAXCHILDNO, MAXRECORDNO)

insert into "TABLE"

values([TUPLE])

delete "TABLE"

drop table "TABLE"

defrule "RULE"

undefrule

echo "STRING"

select "ATT",... / count / sum("ATT") / avg("ATT") / max("ATT") / min("ATT")

where EXPRESSION

from ``TABLE'',...

and / or

= / < / > / =< / =< / \= / in

order by ``ATT''

group by ``ATT''

having EXPRESSION

end

SQL examples

SQL> create table work.

SQL> attribute("number", 1, "integer", 4).

SQL> attribute("name", 2, "char", 20).

SQL> partitions(flat,"../../common/newrel/work").

SQL> end.

Create a relation based on page I/O:

SQL> create table workp.

SQL> attribute("number", 1, "integer", 4).

SQL> attribute("name", 2, "char", 20).

SQL> partitions(page,"../../common/newrel/workp").

SQL> end.

Create a relation with Btree index:

SQL> create table sampleb.

SQL> attribute("number", 1, "integer", 7).

SQL> attribute("yomi", 2, "char", 10).

SQL> partitions(btree, "../../common/newrel/btree/sampleb",1,1).

SQL> parallel_disk({2,"../../common/newrel/btree/sasmpleb", "../../common/newrel/btree1/","../../common/newrel/btree2/"}).

SQL> primary_key(int, 1).

SQL> page(4, 200, 40).

SQL> end.

Insert tuples:

SQL> insert into work.

SQL> values([1,"foo"]).

SQL> values([2,"hoge"]).

SQL> values([3,"bar"]).

SQL> values([4,"afo"]).

SQL> end.

Delete tuples:

SQL> delete.

SQL> from work.

SQL> where number=2.

SQL> end.

Declaration of a transaction:

SQL> start transaction.

SQL> insert into work.

SQL> values([5,"bfo"]).

SQL> end.

SQL> commit transaction.

Rollback the sub-transaction:

SQL> start transaction.

SQL> delete

SQL> from work.

SQL> where number=1.

SQL> end.

SQL> rollback transaction.

Abort the root transaction:

SQL> insert into work.

SQL> values([5,"bfo"]).

SQL> end.

SQL> abortall transaction.

Drop a relation:

SQL> drop table work.

SQL> end.

Get relation without conditions:

SQL> select * .

SQL> from emp.

SQL> end.

Selection1:

SQL> select ename, job, sal, comm.

SQL> from emp.

SQL> where job="manager" or ( sal > [3000] and deptno = [10] ).

SQL> end.

Selection2:

SQL> select ename, dept.

SQL> from emp.

SQL> where dept in [20, 30].

SQL> end.

Join (nested):

SQL> select empno, job, dept.

SQL> from emp.

SQL> where dept = next.

SQL> select dept.

SQL> from dept.

SQL> where location = next.

SQL> select location.

SQL> from location.

SQL> where name = "Sighthill".

SQL> end.

Join:

SQL> select * .

SQL> from emp, dept.

SQL> where emp.dept = dept.dept.

SQL> end.

Count:

SQL> select count.

SQL> from emp.

SQL> where job="manager".

SQL> end.

Group by

SQL> select job, avg(sal).

SQL> from emp.

SQL> group by job.

SQL> end.

Add a rule

SQL> defrule "tmp".

SQL> when retrieve(work).

SQL> if true.

SQL> then immidiate.

SQL> echo "warning".

SQL> end.

Delete a rule

SQL> undefrule.

SQL> where name="tmp".

SQL> end.

Please find examples in "common/input"

Commands accepted by Parade server

[start_transaction]

[commit_transaction]

[rollback_transaction]

[abortall_transaction]

[echo(STRING)]

[create(RELNAME, PARAMETER)]

[drop(RELNAME)]

[insert(RELNAME, LISTOFTUPLES)]

[delete(RELNAME, LISTOFTUPLES)]

[get_relation(RELNAME)]

[join(INRELNAME1, INRELNAME2, CONDITION, OUTRELNAME)]

[selection(INRELNAME, CONDITION, OUTRELNAME)]

[projection(INRELNAME, ATTLIST, OUTRELNAME)]

[difference_rdb(INRELNAME1, INRELNAME2, OUTRELNAME)]

[sort_rdb(INRELNAME, CONDITION, OUTRELNAME)]

[group_by(INRELNAME, ATT, OUTRELNAME)]

[count_rdb(INRELNAME, OUTRELNAME)]

[sum_rdb(INRELNAME, ATT, OUTRELNAME)]

[avg_rdb(INRELNAME, ATT, OUTRELNAME)]

[max_rdb(INRELNAME, ATT, OUTRELNAME)]

[min_rdb(INRELNAME, ATT, OUTRELNAME)]

[copy_rdb(INRELNAME, OUTRELNAME)]

Note

• This software is still under development, and not guaranteed the normal behavior.
• Currently, tables created or dropped by a client are not reflected to the other clients automatically. To reflect these operations, these clients should be restarted.
• Socket communication in Sun Workstations uses asynchronous I/O having some bugs of OS or KLIC, and may hang-up at start up time. At that case, restart the client or server.
• For NEWS-OS 6.1.X, default in /etc/socketconf should be changed from syscall to sockmod.