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How do you use the command-line utilities to manage and monitor an Informix Server? We will discuss onstat, oncheck, and the new InformixHQ to manage your server.
Agenda – Basic Informix Monitoring
Onstat – Discovery Options
Onstat – Performance Ratios
Onstat – User Sessions and Threads
Onstat – Measuring Disk IO
Onstat – Monitoring Locks
Other Onstat Options
Oncheck – Basic Dbspace Checks
Omode – How to terminate a Session
Using InformixHQ
This is the Webcast replay from August 20, 2020.
The slides and example are available on our website at: https://advancedatatools.com/webcasts/informix_monitoring/
informix onstat flags 주제에 대한 자세한 내용은 여기를 참조하세요.
Informix Tutorial Basic Informix Server Monitoring by Lester …
Onstat – Monitor Informix … onstat –g dis Show known Informix servers on machine onstat -c … The “flags” for Dbspaces are: Position 1.
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Basic Informix Server Monitoring By Lester Knutsen 모든 답변
The command “onstat -u” gives some information about the userthreads. In. the 2.column you can see the flags to …
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onstat -d flag – Informix – Database Team
INFORMIX-OnLine Version 7.23.UC1 — On-Line — Up 02:00:38 — 548776. Kbytes. Dbspaces address number flags fchunk nchunks flags owner name
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Analyzing Lockwaits with onstat (Informix) – SAP Help Portal
Use the procedure described here to analyze lockwaits with onstat if there is no … flags. sess. user. wait. tout. locks. 80705758. —P–D. 0. informix.
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주제와 관련된 더 많은 사진을 참조하십시오 Informix Tutorial – Basic Informix Server Monitoring by Lester Knutsen. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
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Informix Onstat Flags | Informix Tutorial – Basic Informix Server Monitoring By Lester Knutsen 모든 답변
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여기에서 이 주제에 대한 비디오를 시청하십시오. 주의 깊게 살펴보고 읽고 있는 내용에 대한 피드백을 제공하세요!
How do you use the command-line utilities to manage and monitor an Informix Server? We will discuss onstat, oncheck, and the new InformixHQ to manage your server.
Agenda – Basic Informix Monitoring
Onstat – Discovery Options
Onstat – Performance Ratios
Onstat – User Sessions and Threads
Onstat – Measuring Disk IO
Onstat – Monitoring Locks
Other Onstat Options
Oncheck – Basic Dbspace Checks
Omode – How to terminate a Session
Using InformixHQ
This is the Webcast replay from August 20, 2020.
The slides and example are available on our website at: https://advancedatatools.com/webcasts/informix_monitoring/
Figure 1. onstat -u command output. Userthreads address flags sess user tty wait tout locks nreads nwrites a4d8018 —P–D 1 informix – 0 0 0 58 4595 …
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The command “onstat -u” gives some information about the userthreads. In the 2.column you can see the flags to each thread. The 1.position
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Onstat – Monitor Informix … onstat –g dis Show known Informix servers on machine onstat -c … The “flags” for Dbspaces are: Position 1.
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Use the procedure described here to analyze lockwaits with onstat if there is no … flags. sess. user. wait. tout. locks. 80705758. —P–D. 0. informix.
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The output also indicates the number of active users and the maximum number of users allowed.
The last part of the line, 17 maximum concurrent , indicates that the maximum number of user threads that were running concurrently since you initialized the database server is 17.
onstat -u command output displays the maximum number of concurrent user threads that were allocated since you initialized the database server. For example, the last line of a sample onstat -u command output is as follows: 4 active, 128 total, 17 maximum concurrent The last line of thecommand output displays the maximum number of concurrent user threads that were allocated since you initialized the database server. For example, the last line of a samplecommand output is as follows:
-u option displays the following output for each user thread. address The shared-memory address of the user thread in the user table. Compare this address with the addresses displayed in the output from the -s option (latches); the output from the -b, -B, and -X options (buffers); and the output from the -k option (locks) to learn what resources this thread is holding or waiting for. flags Provides the status of the session. The flag codes for position 1: B Waiting for a buffer C Waiting for a checkpoint G Waiting for a write of the logical-log buffer L Waiting for a lock S Waiting for mutex T Waiting for a transaction Y Waiting for condition X Waiting for a transaction cleanup (rollback) DEFUNCT The thread has incurred a serious assertion failure, and has been suspended to allow other threads to continue their work. The flag code for position 2: * Transaction active during an I/O failure The flag code for position 3: A A dbspace backup thread For other values that appear here, see the third position of flag codes for the -x option. The flag code for position 4: P Primary thread for a session The flag codes for position 5: R Reading X Thread in critical section The flag codes for position 6: R Thread used in recovery (for example, physical or logical recovery) – Thread not used in recovery The flag codes for position 7: B A B-tree cleaner thread C Terminated user thread waiting for cleanup D A daemon thread F A page-cleaner thread sessid The session identification number. During operations such as parallel sorting and parallel index building, a session might have many user threads associated with it. For this reason, the session ID identifies each unique session. user The user login name, which is derived from the operating system tty The name of the standard error (stderr) file that the user is using, which is derived from the operating system. This field is blank on Windows. wait If the user thread is waiting for a specific latch, lock, mutex, or condition, this field displays the address of the resource. Use this address to map to information provided in the output from the -s (latch) option or the -k (lock) option. If the wait is for a persistent condition, run a grep for the address in the output from the onstat -a command. tout The number of seconds left in the current wait If the value is 0 , the user thread is not waiting for a latch or lock. If the value is -1 , the user thread is in an indefinite wait. locks The number of locks that the user thread is holding The -k output should include a listing for each lock held.) nreads The number of disk reads that the user thread has executed nwrites The number of write calls that the user thread has executed All write calls are writes to the shared-memory buffer cache. Theoption displays the following output for each user thread.
Use the onstat -u command to display a profile of user activity.
onstat -u, B-flag
onstat -u, B-flag Author Message Alexander Sel
#1 / 5 onstat -u, B-flag onstat -u, B-flag
Hello All !
The command “onstat -u” gives some information about the userthreads. In
the 2.column you can see the flags to each thread. The 1.position
indicates the resource a thread is waiting for.
My question is: if there is a “B” on the 1.position, which means the
thread is waiting for a buffer, which buffer is meant – physical log
buffer, logical log buffer, regular buffers ?
example:
…
21d39090 Y–P— 327 root – 21ec36a0 0 1 5
21d394c8 —PR– 362 root – 0 0 1 7654025
3210928
21d39900 Y–P— 363 root – 22498498 0 1 1838
1184
21d39d38 B–PR– 388 root – 2023ce34 0 2 2909837
74403
21d3a5a8 B–PR– 384 root – 201e5fb4 0 2 3214060
9120
21d3a9e0 Y–P— 510 root – 22b58228 0 1 56
21d3b250 –BPX– 387 root – 0 0 2 532577
388370
21d3b688 B-BPR– 386 root – 20316d00 0 2 3329603
12160
…
Background:
I have threads, which make deletes of about 3000 rows in a tables of
3.000.000 rows. Therefor they need 3 – 10 minutes. There are 2 indexes
on each of these tables and no constraints. With onstat -u i see, that
they are sometimes waiting on buffers; so my idea is that waiting for
buffers makes the threads using so much time – any other ideas ?
We are using INFORMIX 7.21 UD1 on SINIX RM’s
Thanks,
Alexander
—
——————————————————————-
Siemens AG Austria | Tel.: +43 1 1707-45960
A-1101 Wien, Gudrunstr. 11 | Fax.: +43 1 1707-55832
——————————————————————-
Wed, 18 Jun 1902 08:00:00 GMT Mario Estra
#2 / 5 onstat -u, B-flag onstat -u, B-flag
Alexander,
Your session id 386 is waiting on a buffer, has issued a begin work,
is the primary thread for the session and was executing an rsam call.
You can find what kind of buffer it is waiting by running the following
sql statement.
SELECT is_wbuff , is_wlogbuff FROM syssessions
WHERE sid = 386;
1 means on , 0 means off
The is_wbuff will indicate “waiting ona buffer” ,
The is_wlogbuff will indicate “waiting on a log buffer”
Regards,
Mario Estrada
———-
Sent: Tuesday, August 26, 1997 4:28 AM
Subject: onstat -u, B-flag
Hello All !
The command “onstat -u” gives some information about the userthreads. In
the 2.column you can see the flags to each thread. The 1.position
indicates the resource a thread is waiting for.
My question is: if there is a “B” on the 1.position, which means the
thread is waiting for a buffer, which buffer is meant – physical log
buffer, logical log buffer, regular buffers ?
example:
…
21d39090 Y–P— 327 root – 21ec36a0 0 1 5
21d394c8 —PR– 362 root – 0 0 1 7654025
3210928
21d39900 Y–P— 363 root – 22498498 0 1 1838
1184
21d39d38 B–PR– 388 root – 2023ce34 0 2 2909837
74403
21d3a5a8 B–PR– 384 root – 201e5fb4 0 2 3214060
9120
21d3a9e0 Y–P— 510 root – 22b58228 0 1 56
21d3b250 –BPX– 387 root – 0 0 2 532577
388370
21d3b688 B-BPR– 386 root – 20316d00 0 2 3329603
12160
…
Background:
I have threads, which make deletes of about 3000 rows in a tables of
3.000.000 rows. Therefor they need 3 – 10 minutes. There are 2 indexes
on each of these tables and no constraints. With onstat -u i see, that
they are sometimes waiting on buffers; so my idea is that waiting for
buffers makes the threads using so much time – any other ideas ?
We are using INFORMIX 7.21 UD1 on SINIX RM’s
Thanks,
Alexander
—
——————————————————————-
Siemens AG Austria | Tel.: +43 1 1707-45960
A-1101 Wien, Gudrunstr. 11 | Fax.: +43 1 1707-55832
——————————————————————-
Wed, 18 Jun 1902 08:00:00 GMT June To
#3 / 5 onstat -u, B-flag onstat -u, B-flag : The command “onstat -u” gives some information about the userthreads. In
: the 2.column you can see the flags to each thread. The 1.position
: indicates the resource a thread is waiting for.
: My question is: if there is a “B” on the 1.position, which means the
: thread is waiting for a buffer, which buffer is meant – physical log
: buffer, logical log buffer, regular buffers ?
Regular buffers.
: Background:
: I have threads, which make deletes of about 3000 rows in a tables of
: 3.000.000 rows. Therefor they need 3 – 10 minutes. There are 2 indexes
: on each of these tables and no constraints. With onstat -u i see, that
: they are sometimes waiting on buffers; so my idea is that waiting for
: buffers makes the threads using so much time – any other ideas ?
What do you mean by “you have threads”? How do you delete the 3000 rows —
all in one transaction, or different “threads”? What is the WHERE clause
on your DELETE? What fields are indexed? Have you turned on SET EXPLAIN?
June
—- June Tong Informix Software —-
—- Senior Consultant (415) 926-6140 —-
—- Location-du-jour: Menlo Park —-
*
* Standard disclaimers apply
*
– Please do not send me requests/questions by mail. When I have the knowledge
– and time permits, I try to answer questions on comp.databases.informix, but
– travel schedule, time, and volume make responding to personal requests
– difficult and often slow. Please call your local Informix Technical Support
– organization for assistance with technical issues.
Wed, 18 Jun 1902 08:00:00 GMT Alexander Sel
#4 / 5 onstat -u, B-flag onstat -u, B-flag Quote:
> : The command “onstat -u” gives some information about the userthreads. In
> : the 2.column you can see the flags to each thread. The 1.position
> : indicates the resource a thread is waiting for.
> : My question is: if there is a “B” on the 1.position, which means the
> : thread is waiting for a buffer, which buffer is meant – physical log
> : buffer, logical log buffer, regular buffers ?
> Regular buffers.
> : Background:
> : I have threads, which make deletes of about 3000 rows in a tables of
> : 3.000.000 rows. Therefor they need 3 – 10 minutes. There are 2 indexes
> : on each of these tables and no constraints. With onstat -u i see, that
> : they are sometimes waiting on buffers; so my idea is that waiting for
> : buffers makes the threads using so much time – any other ideas ?
> What do you mean by “you have threads”? How do you delete the 3000 rows —
> all in one transaction, or different “threads”? What is the WHERE clause
> on your DELETE? What fields are indexed? Have you turned on SET EXPLAIN?
> June
> —- June Tong Informix Software —-
> —- Senior Consultant (415) 926-6140 —-
> —- Location-du-jour: Menlo Park —-
> *
> * Standard disclaimers apply
> *
> – Please do not send me requests/questions by mail. When I have the knowledge
> – and time permits, I try to answer questions on comp.databases.informix, but
> – travel schedule, time, and volume make responding to personal requests
> – difficult and often slow. Please call your local Informix Technical Support
> – organization for assistance with technical issues.
for 29 tables, didn’t come to all tables because it needs to much time
(after 24h the process control killed the update statistics process and
restarted him)
The Problem was, that our UPDATE STATISTICS HIGH, which runs every dayfor 29 tables, didn’t come to all tables because it needs to much time(after 24h the process control killed the update statistics process andrestarted him) I found out that an UPDATE STATISTICS HIGH on the index-attributes and
an UPDATE STATISTICS MEDIUM on the other attributes is enough for the
optimizer to make an index scan (instead of sequential) – and it needs
only half the time of an UPDATE STATISTICS HIGH on the whole table.
Maybe it’s also enogh to use LOW or DITRIBUTIONS ONLY – I don’t know.
On the other side, maybe it’s not necessary to run UPDATE STATISTICS
every day. The tables have about 3.000.000 rows; 200.000 of them are
deleted every day by one process (with “delete from atable where
adatetime <= "xx.xx.xxxx xx:xx:xx"" on adatetime there is an index(dulps) and on adatetime and another attribute there is an unique index) and 200.000 rows are inserted every day (with "insert into atable values(.....)"). How many % of a table must change, so that it's necessary to run UPDATE STATISTICS ? Thanks for your responds Alexander -- ------------------------------------------------------------------- Siemens AG Austria | Tel.: +43 1 1707-45960 A-1101 Wien, Gudrunstr. 11 | Fax.: +43 1 1707-55832 ------------------------------------------------------------------- Wed, 18 Jun 1902 08:00:00 GMT Art S. Kage #5 / 5 onstat -u, B-flag onstat -u, B-flag Quote: > Hello All !
> The command “onstat -u” gives some information about the userthreads. In
> the 2.column you can see the flags to each thread. The 1.position
> indicates the resource a thread is waiting for.
> My question is: if there is a “B” on the 1.position, which means the
> thread is waiting for a buffer, which buffer is meant – physical log
> buffer, logical log buffer, regular buffers ?
> Background:
> I have threads, which make deletes of about 3000 rows in a tables of
> 3.000.000 rows. Therefor they need 3 – 10 minutes. There are 2 indexes
> on each of these tables and no constraints. With onstat -u i see, that
> they are sometimes waiting on buffers; so my idea is that waiting for
> buffers makes the threads using so much time – any other ideas ?
wait for some to be flushed in order to get a buffer, or you do not
have enough LRU queues so that the various processes/threads are
blocking each other from getting at the free buffers that there are.
Do you have only a few thousand buffers for example?
It looks like you either do not have enough buffers, so that you mustwait for some to be flushed in order to get a buffer, or you do nothave enough LRU queues so that the various processes/threads areblocking each other from getting at the free buffers that there are.Do you have only a few thousand buffers for example? Run onstat -F. Are there more than a FEW Foreground Writes? This is
BAD BAD! It is a definite sign that there needs to be more buffers as
your processes are having to flush dirty buffers themselves. I
recommend a minimum of 32 LRUs with AT LEAST 16 cleaners (the 5.0x
rule of thumb of 1 CLEANER per LRU seems to no longer hold because of
the Asynchronous I/O in 7.xx). If you have a large number of buffers
you will want to increase LRUs so that there are <=1000 Buffers per LRU if possible (since there are a maximum of 128 LRUs this is not always possible). Also decreasing LRU_MAX_DIRTY and LRU_MIN_DIRTY will keep the LRU queues cleaner so that more buffers are available at any time. If onstat -F reports a majority of the writes are CHUNK WRITES then this will definitely help, I try to keep at least 75% of writes as LRU WRITES. OH OH OH! I just remembered another possibility. Avoid having exactly 64 LRUs there seems to be a bug in the hash used to select the next LRU if the first is locked. It causes excessive bufwaits when there are exactly 64 LRU queues. I solved this by increasing to 128 LRUs and I know another shop that changed to 32 LRUs and the bufwaits problem went away for them also. The bug may be a multipeak problem but I only know of problems at 64 LRUs. Art S. Kagel Wed, 18 Jun 1902 08:00:00 GMT Page 1 of 1 [ 5 post ] Relevant Pages 1. onstat -u flags 2. onstat -d showing PD and MD Flags 3. flag values in onstat -d 4. onstat -d flags 5. onstat -d flag 6. 7.22 onstat -u flags 7. onstat -g ntt vs onstat -u 8. onstat -u / onstat -g ses Problem 9. onstat -D vs onstat -g iof 10. onstat -D vs. onstat -g iof 11. onstat -d,onstat -D 12. 10 year BS!
Informix, onstat -d flag
Jacques is correct0x1000 means a table in the dbspace was dropped since the lastcheckpoint. This flag affects physical logging.
In case you did not know, 0x0001 means Dbspace is not mirrored, so flag
1001 means that a table was dropped in a non-mirrored dbspace.
Quote:
Analyzing Lockwaits with onstat (Informix) (SAP Library
This procedure tells you how to find the cause of Informix database performance problems when sessions are waiting on locks held by other sessions, which is a common problem.
You can normally use the database monitor to identify the cause of this problem, as described in
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