Question about Number of SCAN listeners on each node
Hi,
I have installed Oracle 11gR2 grid infrastructure on Windows 2008 R2 on a two node RAC. I have followed all of the instruction given in the manual. The installation went smootly without any errors (Actually this was my third attempt!)
I have specified three IP addresses for SCAN in DNS. Now after installation I see three SCAN listener service on node1 and only one SCAN listener service on node two. I though it should be three SCAN listener on each node but I am not sure. My question is should I or shouldn't I have equal number of SCAN listener on each node? I have done three installation and in all attempt I had only one SCAN listener on node 2. The following is the SCAN Listener/VIP status on my system.
C:\Users\Administrator>srvctl config scan_listener
SCAN Listener LISTENER_SCAN1 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN2 exists. Port: TCP:1521
SCAN Listener LISTENER_SCAN3 exists. Port: TCP:1521
C:\Users\Administrator>srvctl config scan
SCAN name: PCOMP-cluster, Network: 1/10.212.2.0/255.255.255.0/Public
SCAN VIP name: scan1, IP: /10.212.2.235/10.212.2.235
SCAN VIP name: scan2, IP: /PCOMPDB01.Pcomp.com/10.212.2.237
SCAN VIP name: scan3, IP: /PCOMPDB01.Pcomp.com/10.212.2.236
Regards,
hga
Can you divide 3 apples between two kids evenly? (actually you can but you cannot slice an IP address in two pieces). This is just the way it is, you will have two scan IPs on one node and only one on the other.
Don't worry about it, the worst thing that can happen is that one listener gets 50% more requests but:
- the listeners really don't have an awful lot to do
- sessions will still get load-balanced between your nodes, it does not matter which listener you connect to
Bjoern
Similar Messages
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Three SCAN listeners on 2-node 11gR2 RAC
Hi there
A colleague of mine has configured a 2-node 11gR2 RAC. I got a chance to explore a bit. I noticed that there are total of three SCAN listeners. Out of the three SCAN2 is on one node and SCAN1 and SCAN3 are on the other node.
I stoped SCAN listeners (using srvctl) and then started them. I found them running the same nodes as they were before. Looks like clusterware somehow keeps track of which SCAN listener is running on which node.
I have few of questions regarding SCAN listener:
Q1: How did Oracle/Clusterware decided to run the SCAN listeners in this configuration (SCAN2 on one node and SCAN1/3 on the other).
Q2: Where does clusterware stores this infomation?
Q3: What if this was a four-node cluster? Would we need to have the SCAN mapped to four-IPs (so that each node has its own SCAN listener)?
Q4: What is the role of the usual standard tns-listener in this 11gR2 RAC environment (because I think it is the SCAN listener that listens for the client's connection requests, right?). Is it redundant ?
Q5: Is it correct to assume that "clusterware somehow keeps track of which SCAN listener is running on which node."?
Regardsuser12033597 wrote:
Hi there
A colleague of mine has configured a 2-node 11gR2 RAC. I got a chance to explore a bit. I noticed that there are total of three SCAN listeners. Out of the three SCAN2 is on one node and SCAN1 and SCAN3 are on the other node.
I stoped SCAN listeners (using srvctl) and then started them. I found them running the same nodes as they were before. Looks like clusterware somehow keeps track of which SCAN listener is running on which node.
I have few of questions regarding SCAN listener:
Q1: How did Oracle/Clusterware decided to run the SCAN listeners in this configuration (SCAN2 on one node and SCAN1/3 on the other). Oracle clusterware is by default designed to restore the previous state of resource. SCAN vip and its associated scna listener are paired, so when scan VIP failsover to other node so does scna listener to same node.
You might have got this configuration after rebooting the nodes which is expected.
Q2: Where does clusterware stores this infomation?OLR(oracle local registry) and OCR
Q3: What if this was a four-node cluster? Would we need to have the SCAN mapped to four-IPs (so that each node has its own SCAN listener)?Oracle recommends to configure max 3 scan VIPS not matter if you have 2 or 10 node cluster. Always configure 3 scan ip for high availability
Q4: What is the role of the usual standard tns-listener in this 11gR2 RAC environment (because I think it is the SCAN listener that listens for the client's connection requests, right?). Is it redundant ?SCAN Listener handsover the connection to node listener(local listener) which then connects to database. If local listener is stopped, you cannot connect to database instance running in that node.
Q5: Is it correct to assume that "clusterware somehow keeps track of which SCAN listener is running on which node."?AFAIK oracle keeps the runtime information in OCR and wheever failover happens OCR is updated with correct information.
>
RegardsI would suggest you to have look at MOS-
11gR2 Grid Infrastructure Single Client Access Name (SCAN) Explained [ID 887522.1]
That document have all info you need -
11gR2 dbcontrol sees RAC SCAN listeners on wrong nodes
Hi,
11.2.0.2.10 RAC with 2 nodes on Linux x64.
After bringing nodes down one at a time yesterday for OS updates, now EM isn't seeing the SCAN listeners on the right nodes anymore. So they all show down, but it's really just thinking they are on the wrong node.
'srvctl status scan' shows:
SCAN VIP scan1 is enabled
SCAN VIP scan1 is running on node data2
SCAN VIP scan2 is enabled
SCAN VIP scan2 is running on node data1
SCAN VIP scan3 is enabled
SCAN VIP scan3 is running on node data1
'emctl config agent listtargets' on data1 shows:
[LISTENER_SCAN1_dlrac, oracle_listener]
'emctl config agent listtargets' on data2 shows:
[LISTENER_SCAN2_dlrac, oracle_listener]
[LISTENER_SCAN3_dlrac, oracle_listener]
I've tried 'emctl clearstate agent' and 'emctl reload agent' on both nodes, which didn't work. Now, if I bring crs on a node down and back up, EM sees the listeners move, but still to the opposite node of where they really are.
Ideas?
Thanks.Please do not use emctl clearstate agent command.
Refer the following doc, if that doesn't help then log an SR with Oracle support.
Database Control (dbconsole) Assistant: Setup,Administration and Access (Search Helper) (Note 1565044.2)
HTH
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I'm reading the Oracle Concepts (I'm new to Oracle) and it seems that, based on the way that Oracle allocates and manages storage the following premise would be true:
Premise: A table that is often accessed using a full table scan (for whatever reasons) would best reside in its own dedicated tablespace.
The main reason I came to this conclusion is that when doing a full table scan, Oracle does multiblock I/O, likely reading one extent at a time. If the Tablespace's datafile(s) only contain data for a single table then a serial read will not have to skip over segments that contain data for other tables (as would be the case if the tablespace is shared with other tables). The performance improvement is probably small but, it would seem that there is one nonetheless.
I'd like to have the thoughts of experienced DBAs regarding the above premise.
Thank you for your contribution,
John.Good morning :) Aman,
>
A little correction! A segment(be it a table,index, cluster, temporary) , would stay always in its own tablespace. Segments can't span tablespaces!
>
Fortunately, I understood that from the beginning :)
You mentioned fragmentation, I understand that too. As rows get deleted small holes start existing in the segment and those holes are not easily reusable because of their limited size.
What I am referring to is different though.
Let's consider a tablespace that is the home of 2 or more tables, the tablespace in turn is represented by one or more OS datafiles, in that case the situation will be as shown in the following diagram (not a very good diagram but... best I can do here ;) ):
Tablespace TablespaceWithManyTables
(segment 1 contents)
TableA Extent 1
TableA Block 1
TableA Block 2
Fragmentation may happen in these blocks or
even across blocks because Oracle allows rows
to span blocks
TableA Block n
End of TableA Extent 1
more extents here all for TableA
(end of segment 1 contents)
(segment 2 contents)
TableZ Extent 5
blocks here
End of TableZ Extent 5
more extents here, all for tableZ
(end of segment 2 contents)
and so on
(more segments belonging to various tables)
end of Tablespace TablespaceWithManyTablesOn the other hand, if the tablespace hosts only one table, the layout will be:
Tablespace TablespaceExclusiveForTableA
(segment 1 contents)
TableA Extent 1
TableA Block 1
TableA Block 2
Fragmentation may happen in these blocks or
even across blocks because Oracle allows rows
to span blocks
TableA Block n
End of TableA Extent 1
another extent for TableA
(end of segment 1 contents)
(segment 2 contents)
TableA Extent 5
blocks here
End of TableA Extent 5
more extents for TableA
(end of segment 2 contents)
and so on
(more segments belonging to TableA)
end of Tablespace TablespaceExclusiveForTableAThe fragmentation you mentioned takes place in both cases. In the first case, regardless of fragmentation, some segments don't belong to the table that is being serially scanned, therefore they have to be skipped over at the OS level. In the second case, since all the extents belong to the same table, they can be read serially at the OS level. I realize that in that case the segments may not be read in the "right" sequence but they don't have to because they can be served to the client app in sequence.
It is because of this that, I thought that if a particular table is mostly read serially, there might be a performance benefit (and also less work for Oracle) to dedicate a tablespace to it.
I can't wait to see what you think of this :)
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Is there a dependancy concerning table size ?
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I have a confusion.
I have read Burleson's post on composite index column ordering (http://www.dba-oracle.com/t_composite_index_multi_column_ordering.htm) where he writes that
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Can anybody explain this ?Dear,
For the moment forget the distinct values and the compressibility. I've tried to reproduce your case here below (using jonathan lewis table script)
create table t1
as
with generator as (
select --+ materialize
rownum id
from dual
connect by
rownum <= 10000
select
rownum c1,
mod(rownum,1000) c2,
mod(rownum,5000) c3,
mod(rownum,10000) c4,
lpad(rownum,10,'0') c5,
rpad('x',5) c6
from
generator v1,
generator v2
where
rownum <= 1000
alter table t1 add constraint t1_pk primary key (c3,c4,c5,C6);
create index idx_1 on t1 (c1,c2);
begin
dbms_stats.gather_table_stats(
ownname => user,
tabname =>'T1',
estimate_percent => 100,
method_opt => 'for all columns size 1'
end;
/and here are what I got with your two selects
mho.sql>> SELECT c1,c2
2 FROM t1
3 WHERE c2 = 3;
C1 C2
3 3
Elapsed: 00:00:00.00
mho.sql>> start dispcursor
PLAN_TABLE_OUTPUT
SQL_ID 4dbgq3m2utd9f, child number 0
SELECT c1,c2 FROM t1 WHERE c2 = 3
Plan hash value: 3723378319
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
|* 1 | INDEX FAST FULL SCAN| IDX_1 | 1 | 1 | 1 |00:00:00.01 | 7 |
Predicate Information (identified by operation id):
1 - filter("C2"=3)
17 rows selected.
Elapsed: 00:00:00.34
mho.sql>> SELECT c3,c4,c5,c6
2 FROM t1
3 WHERE c4 = 3
4 AND c5 = '0000000003'
5 AND c6 = 'x ';
C3 C4 C5 C6
3 3 0000000003 x
Elapsed: 00:00:00.00
mho.sql>> @dispcursor
PLAN_TABLE_OUTPUT
SQL_ID fv62c9uqtktw9, child number 0
SELECT c3,c4,c5,c6 FROM t1 WHERE c4 = 3 AND c5 = '0000000003' AND c6 = 'x '
Plan hash value: 2969533764
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
|* 1 | INDEX FAST FULL SCAN| T1_PK | 1 | 1 | 1 |00:00:00.01 | 9 |
Predicate Information (identified by operation id):
1 - filter(("C4"=3 AND "C5"='0000000003' AND "C6"='x '))
17 rows selected.I didn't succeed to reproduce your index skip scan situation.
Best Regards
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BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
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129 1067
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http://docs.oracle.com/cd/E11882_01/server.112/e25513/dynviews_3016.htm#REFRN30223]
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:SAVED_SQL_ID
9babjv8yq8ru3
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Problem with dbms_xplan.display_cursor
This was precisely what I did
SET SERVEROUTPUT OFFafter that I repeated the whole procedure and this time everything worked pretty well as expected. I checked SQL*Plus documentation for SERVEROUTPUT
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Could anyone kindly make some clarification?
thanks in advance,
Regards,
Dariyoosh>
and also v$session page, yet I didn't find anything indicating that SERVEROUTPUT should be switched off whenever views such as v$sql, v$session
are queired. I don't really understand the link in terms of impact that one can have on the other or better to say rather, why there is an impact
Hi Dariyoosh,
SET SERVEROUTPUT ON has the effect of executing dbms_output.get_lines after each and every statement. Not only related to system view.
Here below what Tom Kyte is explaining in this page:
Now, sqlplus sees this functionality and says "hey, would not it be nice for me to dump this buffer to screen for the user?". So, they added the SQLPlus command "set serveroutput on" which does two things
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