Understanding why too much Parseinfo instances remain active at JVM heap

Hi,
MaxDB 7.6.06.10 64bit community version. (please dont post notes as I dont have the password to see that)
today another system got stuck threads, the reason was all sessions got Vwait, and some command at Finalizer wants to lock a connection that is Running at java side, but waiting for Vwait at dbserver. I have many posts here, like this, but I decided create another one with maybe more or better information about the problem, as I increased my understanding of JDBC driver classes using Eclipse Memory Analyzer Tool (MAT), then here is the facts:
1) Finalizer BLOCKED in thread dump.:
"Finalizer" daemon prio=10 tid=0x000000005e887000 nid=0x67ce waiting for monitor entry [0x0000000041496000]
   java.lang.Thread.State: BLOCKED (on object monitor)
     at com.sap.dbtech.jdbc.StatementSapDB.finalize(StatementSapDB.java:450)
     - waiting to lock <0x00002aaac508ca68> (a com.sap.dbtech.jdbc.ConnectionSapDB)
     at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
2) in MAT i issued an OQL to check what Connection the finalizer is waiting to lock the Finalizer thread have this Outgoing references:
Class Name                                                                                | Shallow Heap | Retained Heap
                                                                                |              |
java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab98e1448 Finalizer Thread                |          168 |         1,384
|- name char[9] @ 0x2aaab9bcf750 Finalizer                                               |           40 |            40
|- <JNI Local> class com.sap.dbtech.jdbc.StatementSapDB @ 0x2aaab43a0428                  |           56 |            56
|- <class> class java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab19b9058 System Class    |            0 |             0
|- <Java Local> com.sap.dbtech.jdbc.ConnectionSapDB @ 0x2aaac0933db8 Busy Monitor         |          200 |       138,400
|- <Java Local> com.sap.dbtech.jdbc.StatementSapDB @ 0x2aaac0bca3f8                       |          112 |           512
|- blockerLock java.lang.Object @ 0x2aaab9bcf710                                          |           16 |            16
|- group java.lang.ThreadGroup @ 0x2aaab98e0d50 system                                   |           72 |           280
|- inheritableThreadLocals java.lang.ThreadLocal$ThreadLocalMap @ 0x2aaaba6cffc0          |           32 |           240
|- threadLocals java.lang.ThreadLocal$ThreadLocalMap @ 0x2aaabe96f3b0                     |           32 |           296
|- <Java Local> java.lang.ref.Finalizer @ 0x2aaac0a8da10                                  |           64 |            64
|- <Java Local> java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab98e1448 Finalizer Thread|          168 |         1,384
|- inheritedAccessControlContext java.security.AccessControlContext @ 0x2aaab9bcf720      |           48 |            48
'- Total: 12 entries                                                                      |              |
3) then inspect the ConnectionSapDB to see the sessionID atribute that is 803661865, that is related to task 164 that is in Vwait like others:
ID   UKT UNIX   TASK       APPL Current         Timeout Region     Wait
          tid   type        pid state          priority cnt try    item
T97    7     -1 User     26568* Vwait                 0 0               10191536(s)
T127   7     -1 User     26568* Vwait                 0 0               10191536(s)
T132   7     -1 User     26568* Vwait                 0 0               10191536(s)
T136   7     -1 User     26568* Vwait                 0 0               10191536(s)
T143   7     -1 User     26568* Vwait                 0 0               10191536(s)
T154   7     -1 User     26568* Vwait                 0 0               10191536(s)
T163   7     -1 User     26568* Vwait                 0 0               10191536(s)
T164   7     -1 User     26568* Vwait                 0 0               10191536(s)
T178   7     -1 User     26568* Vwait                 0 0               10191536(s)
T180   7     -1 User     26568* Vwait                 0 0               10191536(s)
Then here appears we have a deadlock that Finalizer wants to close a Statement but the connection is busy in Vwait in another thread, and perhaps, maybe this Vwait only will go out, if another command will be finalized.
As all times, I think, in some place we dont close all statements or result sets, then I inspected the objects that can reference back the StatementSapDB waiting to be finalize, and here is the incoming stack:
Class Name                                                                                | Shallow Heap | Retained Heap
                                                                                |              |
com.sap.dbtech.jdbc.StatementSapDB @ 0x2aaac0bca3f8                                                   |          112 |           512
|- <Java Local> java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab98e1448 Finalizer Thread            |          168 |         1,384
|- referent java.lang.ref.Finalizer @ 0x2aaac0a8da10                                                  |           64 |            64
|- statement com.sap.dbtech.jdbc.ResultSetSapDB @ 0x2aaac0bca468                                      |          120 |           224
| '- currentResultSet com.sap.dbtech.jdbc.StatementSapDB @ 0x2aaac0bca3f8                            |          112 |           512
|     |- <Java Local> java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab98e1448 Finalizer Thread      |          168 |         1,384
|     |- referent java.lang.ref.Finalizer @ 0x2aaac0a8da10                                            |           64 |            64
|     |- statement com.sap.dbtech.jdbc.ResultSetSapDB @ 0x2aaac0bca468                                |          120 |           224
|     | '- currentResultSet com.sap.dbtech.jdbc.StatementSapDB @ 0x2aaac0bca3f8                      |          112 |           512
|     |     |- <Java Local> java.lang.ref.Finalizer$FinalizerThread @ 0x2aaab98e1448 Finalizer Thread|          168 |         1,384
|     |     |- referent java.lang.ref.Finalizer @ 0x2aaac0a8da10                                      |           64 |            64
|     |     |- statement com.sap.dbtech.jdbc.ResultSetSapDB @ 0x2aaac0bca468                          |          120 |           224
|     |     '- Total: 3 entries                                                                       |              |
|     '- Total: 3 entries                                                                             |              |
'- Total: 3 entries                                                                                |              |
here we can see that the root reference is a ResultSetSapDB, inspecting this object, we can see that the attribute isClosed is true.
inspecting more objects, I found the Parseinfo object that still opened, with this OQL:
SELECT t.sqlCmd.toString(), dominatorof(t) FROM com.sap.dbtech.jdbc.Parseinfo t WHERE (isClosed=false)
that returns about 24566 entries, then I got some that involves a table that maybe have a table lock that causes all Vwait situation, and get the incoming references:
Class Name                                                                      | Shallow Heap | Retained Heap
com.sap.dbtech.jdbc.Parseinfo @ 0x2aaac0b71a60                                  |          120 |           216
|- referent java.lang.ref.Finalizer @ 0x2aaac0b0b450                            |           64 |            64
|- parseinfo com.sap.dbtech.jdbc.CallableStatementSapDB @ 0x2aaac0b71980        |          224 |           352
| |- referent java.lang.ref.Finalizer @ 0x2aaac0b0b490                         |           64 |            64
| |- _inner com.sap.dbtech.jdbc.trace.PreparedStatement @ 0x2aaac0b71ad8       |           80 |           128
| | |- referent java.lang.ref.Finalizer @ 0x2aaac0b0b410                      |           64 |           192
| | |- referent java.lang.ref.WeakReference @ 0x2aaac1437a08                  |           48 |            48
| | | '- weakRef com.sap.dbtech.jdbc.trace.PreparedStatement @ 0x2aaac0b71ad8|           80 |           128
| | '- Total: 2 entries                                                       |              |
| '- Total: 2 entries                                                          |              |
'- Total: 2 entries                                                             |              |
Again, all appears to be closed, but still some internal classes must be finalized, that must lock connection for that.
as I checked my code, all statements get closed, with try, finally, following best pratices of JDBC when you had connection pool.
then why that Statement must be finalized? and why that must lock the Connection? and why too much ParseInfo waiting to be finalized?
With this scenario, is right to say, that MaxDB JDBC driver, cant use pool as some objects must finalized after all Statement and ResultSets are closed? Something dependent on connection avoid that to be reused? or what is the right clean code to be done with MaxDB JDBC driver, before you can reuse that connection?
regards
Clóvis
Edited by: Clovis Wichoski on Apr 7, 2011 7:47 PM

Hi Natalia,
My server crash again, with stucked threads, then I updated with newer JDBC driver got from DatabaseStudio, that is:
package com.sap.dbtech.jdbc, MaxDB JDBC Driver, SAP AG, 7.6.06 Build 007-000-009-441 (Make-Version: 7.8.01 Build 018-121-240-252)
with this version, the ParseInfo ammount reduced to 466 entries, but I still think that this are too much Parseinfo objects, as we can see many Parseinfo that isClosed equals false, but we cant find any ResultSet or Statement openned and using this Parseinfo, follow a sample of Parseinfo with incoming references:
Class Name                                                                                | Shallow Heap | Retained Heap
                                                                                |              |
com.sap.dbtech.jdbc.Parseinfo @ 0x2aaacd9d2ce0                                             |          120 |         4,280
|- parseinfo com.sap.dbtech.jdbc.CallableStatementSapDBFinalize @ 0x2aaacd9d2b98           |          232 |           416
| |- _inner com.sap.dbtech.jdbc.trace.PreparedStatement @ 0x2aaacd9d2b48                  |           80 |            80
| | |- referent java.lang.ref.WeakReference @ 0x2aaacd9d2b18                             |           48 |            48
| | |- _stmt org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement @ 0x2aaacda2bc70    |           72 |           216
| | | |- _stmt org.apache.tomcat.dbcp.dbcp.DelegatingPreparedStatement @ 0x2aaacda2bb98 |           72 |           216
| | | |- [7] java.lang.Object[16] @ 0x2aaacdb3bf58                                      |          152 |           152
| | | | '- elementData java.util.ArrayList @ 0x2aaacd5d1ec0                            |           40 |           192
| | | |     '- traceList org.apache.tomcat.dbcp.dbcp.PoolableConnection @ 0x2aaacd5d1e78|           72 |           264
| | | '- Total: 2 entries                                                               |              |
| | |- referent java.lang.ref.Finalizer @ 0x2aaacdb48288                                 |           64 |       278,784
| | '- Total: 3 entries                                                                  |              |
| |- referent java.lang.ref.Finalizer @ 0x2aaacdb48208                                    |           64 |       278,656
| '- Total: 2 entries                                                                     |              |
|- referent java.lang.ref.Finalizer @ 0x2aaacdb48248                                       |           64 |       278,720
'- Total: 2 entries                                                                        |              |
You know if exists a newer version of JDBC driver that this one I'm using?
best regards
Clóvis

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Get a powered hub
USB is cranky, you're not the first (probably not the last) to have this happen.

A barcode scanner that was connected directly to the Mac's USB port stopped working as the "USB had too much power drawn", even though it has worked for over a year in that port. WHen we plugged it into the port on the keyboard, the device works. Why?

A barcode scanner that was connected directly to the Mac's USB port stopped working as the "USB had too much power drawn", even though it has worked for over a year in that port. When we plugged it into the port on the keyboard, the device works. Why? Obviously the device is operational. Could the USB port have burned out from having too much power drawn? If so, is it reparable?

It can't draw "too much" power, it can only draw as much as the USB port is able to provide and no more. IIRC, the keyboard port has a lower power output than the iMac's port.
That being said, yea, it's possible that the port has failed and it can be replaced or if another port works you can use that one. Although if it is still under warranty or covered by Apple Care, then I would take it to an Apple Store or service provider to get the port repaired.

It came to my attention there a new program working with itune since last update named Apsdaemon.exe its been using 99% of my processor when its active any idea why so much and will it be fix eventually? And why is it so Heavy consuming ?

It came to my attention there a new program working with itune since last update named Apsdaemon.exe its been using 99% of my processus when its active.
Any idea why so much and will it be fix eventually because before last update i never encounter any issue using Itune? Now when that aplication or extention from Itune is working my computor froze to a huge alt. I play video games online and love listening to my music with itune playing in the background and normally was able to have firefox open and a program called ventrillo all working at the same time and now i can barelly have itune and play a game. As soon it start been choppy i just control alt delete wait 5 minute to close down apsdaemon.exe when i'm capable most of the time i have to restart my computor. And why is it so Heavy consuming on the process its memory utility is under the 100ko i believe so why 99% of my processus is been use ?
a good exemple i could give is itune.exe working it shows process 02% for 123 000ko that is light and perfect.

Wow, Karan Taneja, you've just embarrassed yourself on a worldwide support forum. Not only is your post ridiculous and completely inappropriate for a technical support forum, but it also shows your ignorance as to whom you think the audience is. Apple is not here. It's users, like you.
If you would have spent half the time actually reading the Terms of Use of this forum that YOU agreed to by signing up to post, as you did composing that usesless, inappropriate post, you (and the rest of us on this forum) would have been much better off.

Oracle Instances Processes consuming too much memory

Will somebody be able to guide me with the factors that are causing too much memory consumption when a single Oracle.exe instance is started ? Due to this problem it is not possible to run 2 instances at the same time.
Oracle is running on Windows NT 4.0 SP6.
Oracle version 8.1.6.0.0
Currently we have 512MBytes of ram.(4.83G free space)
One of the Instance consumes as much as 178,320K of Ram,
another consumes about 138,000K

Oracle consumes as much memory as you want, but more memory is faster.
Review your init.ora (db_block_buffer y shared_pool_size)
(It4s posible to run 10 instances in a machine with just 1 Gigabyte and they work fine. It depends on the use of the databases, the number of users, just for production or development, etc, ...).

All I want is all my contacts on my phone and the same on my iMac, but no, that's too much to ask, instead I get everything doubled up on the phone and everything doubled up (triple in some cases) on the iMac, why does it do this? and more importantly how

All I want is all my contacts on my phone and the same on my iMac, but no, that's too much to ask, instead I get everything doubled up on the phone and everything doubled up (triple in some cases) on the iMac, why does it do this? and more importantly how can I stop it? Thanks

Look under system preferences on the mac at what is be controlled? Look at Mail, Contacts, Calendars. How many accounts are managing contacts? Just the cloud? the cloud and gmail? or cloud, gmail, yahoo, and exchange? If you have more than one contact account, then you will have different contact lists, if John Smith shows up in more than one of your contact lists, you will have multiple entries.
Pick a contact list that is your master, (I use iCloud), only turn on contact syncing for it. The same for your phone. Spend some time on the iCloud webset (www.icloud.com) and work on your contact list there. Clean it up, remove duplicates, etc...Changes will auto sync back to all your devices. Life gets much simplier.
Just remember, if you sync different contacts lists and a large number of people appear in your different lists, then they will appear as duplicates.

Understanding why too much Parseinfo instances remain active at JVM heap

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