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I recently investigated a performance problem on an Oracle 11.
We had a hardware failure on the database server, within 30 seconds the database had automatically been restarted on an idle identical member of the cluster and the application continued on the new database host.
A few days later I just happened to notice the following change in the LGWR trace file.
Note: The following is based on testing with 11.
There are a number of reasons for the wait but the most common reason I have come across at my site is best described by a forum posting I found by Jonathan Lewis.
We have often come across the problem when a SELECT statement tries to read a row which is involved in a distributed transaction 4 Australia.
The problem is with the round trip latency to Australia.
It is possible that during the communication of the PREPARE and COMMIT phases you have a 200ms — 300ms latency.
There are a number 4 tricks you can use to try and reduce these problems by finding ways to separate the rows the SELECT statement reads on the UK data from the rows involved in the Australian transaction.
We use tricks like careful usage of indexes to ensure нажмите чтобы прочитать больше reader can go directly to the UK data and not even evaluate the row involved in the Australian 2pc Partitioning can also help here too.
A few months ago we noticed after an upgrade to 11g we would occasionally be missing some sql statements from the monitor graphs.
We investigated видеть, Кроссовки adidas Originals ZX 500 RM фраза problem, re-produced a test case, raised a bug with Oracle and Support has just released an 11.
Before I explain the issue and demonstrate the issue, I will explain what prompted me to post this blog item.
We have our AWR collection threshold set to collect as many sql statements as possible.
This problem has nothing to do with the cost of the SQL statements and you could well find your most expensive sql statement just disappear from AWR for a period of time.
I am going to take the approach of detailing the observations made from our production and test systems and avoid attempting to cover how other versions of Oracle behave.
The investigation also uncovers a confusing database statistic which we are currently discussing with Oracle Development so they can decide if this is an Oracle coding bug or a documentation issue.
The initial IO issue We run a simple home grown database monitor which watches database wait events and sends an email alert if it detects either a single session waiting on a non-idle wait for a long time or the total number of database sessions concurrently waiting goes above a defined threshold.
The monitor can give a number of false 4 but can also draw our attention to some more interesting events.
Both databases share the same storage array so the obvious place to start was to look at the storage statistics.
We found a strange period lasting around 10 seconds long when both databases had a large increase in redo write service times and a few seconds when no IO was written at all.
The first database we looked at seemed to show increase in disk service times for a very similar work Махровый халат (EFW) />It seems the first database was slowed down by the second database flushing 5GB of data.
Where did 5GB of data file writes come from, and what triggered it?
Looking at ссылка на продолжение database we knew there were no corresponding redo writes, there were no obvious large sql statements reading or writing.
We confirmed these writes were real and not something outside the database.
My site recently upgraded one of its databases to the 10.
Once we had completed the upgrade, we noticed a number of data feeds to the upgraded database 4 to fall behind and could no longer keep up.
When we stopped and restarted the feeds they appeared to speed up.
We use a couple of products to dynamically feed data to our 10.
PARSE leaks session heap memory in 10.
Although the bug discusses a memory leak, we found that the performance also degrades over time.
We applied the patch for 10269717 and the PGA memory leak was resolved but more importantly the performance remained constant.
I just checked 4 10.
I would not expect the problem to actually affect many sites so I am not going to spend a huge amount of time showing the test case but thought I would make people aware of the моему Сумка Эль Маста весьма issue.
It simply manages the running of some time critical business tasks in parallel but takes full control of the business rules and co-ordinates that all the tasks are complete, verified and handles the rules if parts fail to complete.
When I plotted the PGA memory data we could clearly see the PGA memory appeared to grow during busy periods and not at all at off peak times but importantly never reduced.
I sent M35 030 KAV models 1/35 Окрасочная маска на остекление Смерч (Meng) внешняя memory usage graph to a colleague and after a short while, he sent me back a graph which looked 100% the same as mine……except his graph had a totally different scale and was not memory.
The graph he sent me was actually the total number of tasks our scheduler processes was asked to run in the same time period.
Oracle knows about all about the memory and when your plsql package completes all the PGA memory is returned.
The problem is Oracle does not free the memory during the execution of the main plsql procedure.
There is a very specific set of circumstances which must occur for this issue to show itself, but will result in tables and I suspect indexes growing significantly larger than they need to be.
I am aware that the problem exists in versions 10.
The conditions required to cause the issue My site has a number of daemon style jobs running permanently on the database loading data into a message table.
We only need to keep the messages for a short time, so we have another daemon job whose role is to delete the messages from the table as soon as the expiry time is reached.
In one example we only need to retain the data for a few minutes after which time we no longer need it and we also wanted to keep the table as small as possible so it remained cached in the buffer cache helped by a KEEP pool.
When we 4 the code, we expected the message table to remain at a fairly constant size of 50 — 100MB in size.
The INSERT statements were never re-using the space made free by the delete statement run in another session.
Jonathan Lewis https://sekretlady.ru/black/tsvetnaya-dobavka-bezammiachnaya-chi-ionic-permanent-shine-hair-color-additive-gold-dlya-okrashivani.html reference to a 11g bug related to using a KEEP POOL in his note.
The bug Jonathan references Bug 8897574 causes problems if you assign any large object to a KEEP POOL because by default, 11g would подробнее на этой странице large objects using the new direct IO feature and avoid ever placing the object in the KEEP POOL.
The whole point of using the KEEP POOL is to identify objects you do want to protect and keep in a cache.
The site where I work makes significant use of KEEP pools and also has spent some time investigating aspects relating to serial direct IO vs.
I want to use this blog entry to explore a number of related issues but also demonstrate that the 11g bug Jonathan identified seems to also exists in 10.
The formatter is not intended to replace the really good tools https://sekretlady.ru/black/lotok-kabelniy-lestnichniy-dkc-ulm386-80-h-600-h-3000-mm.html are out there, вот ссылка I like reading the detail which appears in a raw trace file but with some additional help.
I also wanted to structure the trace file so it could be processed by other scripts separately.
This is by no means written to a commercial standard, but I thought people may find it useful and also provide interesting insite on how to process trace files.
I worked within a previous company to build a benchmark based on Oracle trace files using some software he had written in his book Scaling Oracle 8i, the paper and the later software.
The benchmark software contained an awk script to process traces files and extract the entry point database calls and convert them to a tcl scripting language to then drive the benchmark.
I took with permission the conversion script and modified it so it generated a Oracle trace 4 but with extra information.
It reminds me of some issues which existed in Oracle 9i and 10g but appear to have been resolved in 11gR1 and 11gR2.
Oracle 9i introduced a patch to change behaviour regarding online Index Rebuilds.
The default behaviour in 9i and 10g is that an Online Index Rebuild would get blocked behind a long active transaction which uses the index which is still true in 11g but critically then would also block any new DML wanting to also modify the index Leading to a hang 4 the application as 4 as the index build.
They introduced a new database EVENT 10629 in 4 9i patch which would mean the Online Index Rebuild would keep trying to acquire its locks but would keep backing off to allow other DML to continue.
Level 1 means backoff and retry indefinitely.
There is more information on Meta link note: 3566511.
The very important thing to me is the 11g versions no longer cause other unrelated DML to become stuck behind a long running active transaction.
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