[SOLVED] Pacman Performance Issue

Hey everybody:
I have a weird performance problem with pacman. When I tell it to download something, it works fine when it is finding the package, figuring out dependencies, and processing the command.
Then, when it gets to downloading, it'll take a few to several minutes to start downloading a package, download it at a normal/acceptable speed, then take a few to several minutes to start downloading the next package.
I'm not sure what's causing this problem but I could see this beeing a nuissance for upgrades and things like that. Or right now, because it's a fresh install and I'm trying to install Gnome, lol. This behavior is also experienced when I'm updating the mirrors (pacman -Syy).
I'm going to let it run overnight where it'll probably be done by the time I get back to work in the morning, but this seems like there's something wrong because I just tried on my laptop (on the same LAN) and it works as fast as I'd ever seen it. In the past, I've never done any optimization or mirror ranking and I haven't experienced this issue before.
Thanks!
Last edited by mrmylanman (2011-06-03 12:41:45)

Well, the install on the desktop was brand new, but they were both working from the same (default) mirror list. I commented out the first few entries, as well as archlinux.org and a few others that seemed far away from their names, and tried it again. Same issue.
I thought it might be an issue with the DNS servers, so I tried pinging google, yahoo, and like xmission and a few others that it may not have cached and they all got resolved pretty quick.
Seems very strange. I remember yum being extremely slow, now that I think about it, but I used Fedora last about 3 years ago now (this was a different building and different internet plan at the time). Apt seemed quick enough (since Fedora I have been dual-booting Windows and Debian).
We have a fiber optic connection at work, not particularly fast at download but has good upload (more important for us), and we have a local DNS caching server. It has caused some problems before, but it seems to have been behaving today (and for several months now).
Thanks again, love the forums and I'm glad to be getting Debian off my work PC (strange as it is, I'm more comfortable with Arch now than I am with Debian).
Last edited by mrmylanman (2011-06-02 22:37:02)

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Last edited by RAH (2008-08-15 18:28:42)

pacman -Rd xulrunner and delete these files /usr/include/xulrunner-1.9 /usr/lib/xulrunner-1.9 /usr/lib/xulrunner-devel-1.9 /usr/share/idl/xulrunner-1.9. Re-install xulrunner and your good to go. Alternatively force the upgrade with pacman -Syuf.

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Last edited by [email protected] (2008-12-22 10:22:47)

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karol wrote:
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*Start of changes for CIP 6203752 by PGOX02
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Moderator message - Please see Please Read before Posting in the Performance and Tuning Forum before posting and please use code tags when posting code - post locked
Edited by: Rob Burbank on Feb 4, 2010 9:03 AM

Hi friends ,
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*Start of changes for CIP 6203752 by PGOX02
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Thanks & Regards,
Manoj Kumar .Thatha
Moderator message - Please see Please Read before Posting in the Performance and Tuning Forum before posting and please use code tags when posting code - post locked
Edited by: Rob Burbank on Feb 4, 2010 9:03 AM

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WORK_STATION_NAME                                  VARCHAR2(80)
OS_USER                                            VARCHAR2(30)
USER_NAME                                 NOT NULL VARCHAR2(30)
FORM_ID                                            NUMBER
AUDIT_TRAIL_NO                                     NUMBER
CREATED_BY                                         VARCHAR2(30)
CREATION_DATE                                      DATE
LAST_UPDATED_BY                                    VARCHAR2(30)
LAST_UPDATE_DATE                                   DATE
SITE_NO                                            NUMBER
SESSION_ID                                         NUMBER(8)
The query
UPDATE BSOA SET LOGOUT_TIME =SYSDATE WHERE SYS_CONTEXT('USERENV', 'SESSIONID') = SESSION_ID
Is taking a lot of time to execute and in AWR reports also it is on top in
1. SQL Order by elapsed time
2. SQL order by reads
3. SQL order by gets
So i am trying a way to solve the performance issue as the application is slow specially during login and logout time.
I understand that the function in the where condition cause to do FTS, but i can not think what other parts to look at.
Also:
SQL> SELECT COUNT(1) FROM BSOA;
COUNT(1)
   7800373
The explain plan for "UPDATE BSOA SET LOGOUT_TIME =SYSDATE WHERE SYS_CONTEXT('USERENV', 'SESSIONID') = SESSION_ID" is
{code}
PLAN_TABLE_OUTPUT
Plan hash value: 1184960901
| Id | Operation          | Name               | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | UPDATE STATEMENT   |                    |     1 |    26 | 18748   (3)| 00:03:45 |
|   1 | UPDATE            | BSOA |       |       |            |          |
|* 2 |   TABLE ACCESS FULL| BSOA |     1 |    26 | 18748   (3)| 00:03:45 |
Predicate Information (identified by operation id):
   2 - filter("SESSION_ID"=TO_NUMBER(SYS_CONTEXT('USERENV','SESSIONID')))
{code}

Hi,
There are also triggers before update and AUDITS on this table.
CREATE OR REPLACE TRIGGER B2.TRIGGER1
BEFORE UPDATE
ON B2.BSOA REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
:NEW.LAST_UPDATED_BY   := USER    ;
:NEW.LAST_UPDATE_DATE := SYSDATE ;
END;
CREATE OR REPLACE TRIGGER B2.TRIGGER2
BEFORE INSERT
ON B2.BSOA REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
:NEW.CREATED_BY        := USER ;
:NEW.CREATION_DATE     := SYSDATE ;
:NEW.LAST_UPDATED_BY   := USER    ;
:NEW.LAST_UPDATE_DATE := SYSDATE ;
END;
And also there is an audit on this table
AUDIT UPDATE ON B2.BSOA BY ACCESS WHENEVER SUCCESSFUL;
AUDIT UPDATE ON B2.BSOA BY ACCESS WHENEVER NOT SUCCESSFUL;
And the sessionid column in BSOA has height balanced histogram.
When i create an index i get the following error. As i am on 10g I can't use DDL_LOCK_TIMEOUT . I may have to wait for next down time.
SQL> CREATE INDEX B2.BSOA_SESSID_I ON B2.BSOA(SESSION_ID) TABLESPACE B2 COMPUTE STATISTICS;
CREATE INDEX B2.BSOA_SESSID_I ON B2.BSOA(SESSION_ID) TABLESPACE B2 COMPUTE STATISTICS
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specified
Thanks

Can i using RMI to solve performance issue

I have two database which in USA and CHINA, and a web application which located on USA, if the application connect to USA DB it is ok, i think no performance issue, but if connet to china DB, i sure that has even throgh VPN. So can i using RIM technology to solving the issue? Or using another solution. Thanks

So can i using RIM technology to solving the issue?It sounds like your problem is with Network latency.
I assume your web application connects to the database directly through JDBC and you're proposing to add a middle layer of RMI. Doing this will not reduce network latency - however if you're clever about how you serialize your resultsets, you can reduce the amount of network traffic and improve performance.
Have a look at this thread about compressing RMI data:
http://forum.java.sun.com/thread.jspa?threadID=606187&tstart=0
Note that compressing the data will add processing overhead at both ends.
Also remember to override the readObject/writeObject methods in the objects you're serializing.

How to solve performance issue

Hi
        How to resolve performance issue in following select query-
SELECT *
          INTO CORRESPONDING FIELDS OF TABLE it_final
          FROM ce1zcsc
          WHERE paledger EQ c_10                 "Currency Type
          AND   vrgar     IN s_vrgar              "Record Type
          AND   versi     EQ space                "Plan Version
          AND   perio     IN r_perio              "Period
          AND   bukrs     IN s_bukrs.             "Company Code
TABLE CE1ZCSC has around 173 fields,but it_final has around 105 fields.
The indexes are created for the following fields:
paledger
vrgar
versi
perio
bukrs and
prctr.
I doubt whether we should look for Estim. CPU-Costs in index range scan or table access by index rowid in Execution plan for SQL statement.
If anybody can provide me with informative documents on performance issue.

Hi,
Dont use " * " & " corresponding fields " in the select query rather declare all the fields and use the "into table" clause.
Let me know if you still face the same problem.
-Naveen.

[SOLVED] Pacman Performance Issue

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