ConnectionPool crashes once database server is down
Hi,
I have written a connection pool to connect to a Oracle database from a servlet script. The connection pool creates a pool of say 5 connections and when required a servlet picks up a connection from the pool uses it and then frees it. Now once the database server goes down the servlet throws sqlexception when it tries to connect to the database with the connection obtained from the pool...this is just fine. But now even if the database is up and running again the servlet still throws the same SQLException(IO problem). I have to restart the Application server to get my servlet working again.
Does anyone have any idea about why this happens ?????????
Seems to me that your Connection object should catch the "failed to connect" error and set an internal flag to indicate that it is now unusable. (And then throw that error on to its caller, of course.) And then the code that gives out Connections from the pool should inspect that flag, and if the Connection is unusable it should throw it away and try to create a new one.
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Thanks a lot!Thanks.The following paragraph is in my alert.log,but I can not find the problem yet.And in my trace file ,there is no information for that day.
Sun Apr 06 05:15:53 2003
Thread 1 advanced to log sequence 282
Current log# 3 seq# 282 mem# 0: D:\ORACLE\ORADATA\MPTDATA\REDO03.LOG
Mon Apr 07 05:15:29 2003
Thread 1 advanced to log sequence 283
Current log# 1 seq# 283 mem# 0: D:\ORACLE\ORADATA\MPTDATA\REDO01.LOG
Dump file D:\Oracle\admin\mptdata\bdump\mptdataALRT.LOG
Mon Apr 07 19:32:42 2003
ORACLE V8.1.6.0.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows 2000 Version 5.0 , CPU type 586
Starting up ORACLE RDBMS Version: 8.1.6.0.0.
System parameters with non-default values:
processes = 500
shared_pool_size = 134217728
large_pool_size = 1048576
java_pool_size = 20971520
control_files = D:\Oracle\oradata\mptdata\control01.ctl, D:\Oracle\oradata\mptdata\control02.ctl, D:\Oracle\oradata\mptdata\control03.ctl
db_block_buffers = 32000
db_block_size = 8192
compatible = 8.1.0
log_buffer = 16777216
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
db_files = 1024
db_file_multiblock_read_count= 8
max_enabled_roles = 30
remote_login_passwordfile= EXCLUSIVE
global_names = TRUE
distributed_transactions = 10
instance_name = mptdata
service_names = mptdata
mts_dispatchers = (protocol=TCP)
open_links = 4
sort_area_size = 65536
sort_area_retained_size = 65536
db_name = mptdata
open_cursors = 600
os_authent_prefix =
job_queue_processes = 4
job_queue_interval = 60
parallel_max_servers = 2
background_dump_dest = D:\Oracle\admin\mptdata\bdump
user_dump_dest = D:\Oracle\admin\mptdata\udump
max_dump_file_size = 10240
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PMON started with pid=4
DBW0 started with pid=7
LGWR started with pid=13
CKPT started with pid=19
SMON started with pid=24
RECO started with pid=30
SNP0 started with pid=6
SNP1 started with pid=14
SNP2 started with pid=20
SNP3 started with pid=23
Mon Apr 07 19:32:46 2003
starting up 1 shared server(s) ...
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
Mon Apr 07 19:32:47 2003
alter database mount exclusive
Mon Apr 07 19:32:55 2003
Successful mount of redo thread 1, with mount id 1041561895.
Mon Apr 07 19:32:55 2003
Database mounted in Exclusive Mode.
Completed: alter database mount exclusive
Mon Apr 07 19:32:55 2003
alter database open
Beginning crash recovery of 1 threads
Mon Apr 07 19:33:00 2003
Thread recovery: start rolling forward thread 1
Recovery of Online Redo Log: Thread 1 Group 1 Seq 283 Reading mem 0
Mem# 0 errs 0: D:\ORACLE\ORADATA\MPTDATA\REDO01.LOG
Mon Apr 07 19:33:01 2003
Thread recovery: finish rolling forward thread 1
Thread recovery: 0 data blocks read, 0 data blocks written, 0 redo blocks read
Crash recovery completed successfully
Mon Apr 07 19:33:05 2003
Thread 1 advanced to log sequence 284
Thread 1 opened at log sequence 284
Current log# 2 seq# 284 mem# 0: D:\ORACLE\ORADATA\MPTDATA\REDO02.LOG
Successful open of redo thread 1.
Mon Apr 07 19:33:07 2003
SMON: enabling cache recovery
SMON: enabling tx recovery
Mon Apr 07 19:33:13 2003
Completed: alter database open
Mon Apr 07 19:39:31 2003
Shutting down instance (immediate)
License high water mark = 37
Mon Apr 07 19:40:36 2003
alter database close normal
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SMON: disabling tx recovery
SMON: disabling cache recovery
Mon Apr 07 19:40:40 2003
Thread 1 closed at log sequence 284
Mon Apr 07 19:40:40 2003
Completed: alter database close normal
Mon Apr 07 19:40:40 2003
alter database dismount
Completed: alter database dismount
archiving is disabled
Dump file D:\Oracle\admin\mptdata\bdump\mptdataALRT.LOG
Mon Apr 07 19:41:42 2003
ORACLE V8.1.6.0.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows 2000 Version 5.0 , CPU type 586
Starting up ORACLE RDBMS Version: 8.1.6.0.0.
System parameters with non-default values:
processes = 500
shared_pool_size = 268435456
large_pool_size = 943718400
java_pool_size = 20971520
control_files = D:\Oracle\oradata\mptdata\control01.ctl, D:\Oracle\oradata\mptdata\control02.ctl, D:\Oracle\oradata\mptdata\control03.ctl
db_block_buffers = 32000
db_block_size = 8192
compatible = 8.1.0
log_buffer = 16777216
log_checkpoint_interval = 10000
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db_file_multiblock_read_count= 8
max_enabled_roles = 30
remote_login_passwordfile= EXCLUSIVE
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distributed_transactions = 10
instance_name = mptdata
service_names = mptdata
mts_dispatchers = (protocol=TCP)
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sort_area_size = 65536
sort_area_retained_size = 65536
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open_cursors = 200
os_authent_prefix =
job_queue_processes = 4
job_queue_interval = 60
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user_dump_dest = D:\Oracle\admin\mptdata\udump
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PMON started with pid=3
DBW0 started with pid=6
LGWR started with pid=11
CKPT started with pid=15
SMON started with pid=19
RECO started with pid=24
SNP0 started with pid=28
SNP1 started with pid=32
SNP2 started with pid=36
SNP3 started with pid=5
Mon Apr 07 19:41:46 2003
starting up 1 shared server(s) ...
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
Mon Apr 07 19:41:47 2003
alter database mount exclusive
Mon Apr 07 19:41:54 2003
Successful mount of redo thread 1, with mount id 1041535042.
Mon Apr 07 19:41:54 2003
Database mounted in Exclusive Mode.
Completed: alter database mount exclusive
Mon Apr 07 19:41:54 2003
alter database open
Mon Apr 07 19:41:57 2003
Thread 1 opened at log sequence 284
Current log# 2 seq# 284 mem# 0: D:\ORACLE\ORADATA\MPTDATA\REDO02.LOG
Successful open of redo thread 1.
Mon Apr 07 19:41:57 2003
SMON: enabling cache recovery
SMON: enabling tx recovery
Mon Apr 07 19:42:01 2003
Completed: alter database open
Shutting down instance (immediate)
License high water mark = 52
Mon Apr 07 22:28:45 2003
alter database close normal
Mon Apr 07 22:28:45 2003
SMON: disabling tx recovery
SMON: disabling cache recovery
Mon Apr 07 22:28:49 2003
Thread 1 closed at log sequence 284
Mon Apr 07 22:28:50 2003
Completed: alter database close normal
Mon Apr 07 22:28:50 2003
alter database dismount
Completed: alter database dismount
archiving is disabled
Dump file D:\Oracle\admin\mptdata\bdump\mptdataALRT.LOG
Mon Apr 07 22:29:24 2003
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vsnsql=e vsnxtr=3
Windows 2000 Version 5.0 , CPU type 586
Starting up ORACLE RDBMS Version: 8.1.6.0.0.
System parameters with non-default values:
processes = 500
shared_pool_size = 268435456
large_pool_size = 943718400
java_pool_size = 20971520
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db_block_buffers = 32000
db_block_size = 8192
compatible = 8.1.0
log_buffer = 16777216
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
db_files = 1024
db_file_multiblock_read_count= 8
max_enabled_roles = 30
remote_login_passwordfile= EXCLUSIVE
global_names = TRUE
distributed_transactions = 10
instance_name = mptdata
service_names = mptdata
mts_dispatchers = (protocol=TCP)
open_links = 4
sort_area_size = 65536
sort_area_retained_size = 65536
db_name = mptdata
open_cursors = 600
os_authent_prefix =
job_queue_processes = 4
job_queue_interval = 60
parallel_max_servers = 2
background_dump_dest = D:\Oracle\admin\mptdata\bdump
user_dump_dest = D:\Oracle\admin\mptdata\udump
max_dump_file_size = 10240
oracle_trace_collection_name=
PMON started with pid=4
DBW0 started with pid=8
LGWR started with pid=14
CKPT started with pid=21
SMON started with pid=28
RECO started with pid=35
SNP0 started with pid=42
SNP1 started with pid=49
SNP2 started with pid=56
SNP3 started with pid=63
Mon Apr 07 22:29:28 2003
starting up 1 shared server(s) ...
starting up 1 dispatcher(s) for network address '(ADDRESS=(PARTIAL=YES)(PROTOCOL=TCP))'...
Mon Apr 07 22:29:29 2003
alter database mount exclusive
Mon Apr 07 22:29:36 2003
Successful mount of redo thread 1, with mount id 1041548688.
Mon Apr 07 22:29:36 2003
Database mounted in Exclusive Mode.
Completed: alter database mount exclusive
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alter database open
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Thread 1 opened at log sequence 284
Current log# 2 seq# 284 mem# 0: D:\ORACLE\ORADATA\MPTDATA\REDO02.LOG
Successful open of redo thread 1.
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SMON: enabling cache recovery
SMON: enabling tx recovery
Mon Apr 07 22:29:42 2003
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Repost
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Hi all,
I have a problem i've been trying 2 solve for several weeks now.
I'm running a Java Class which connects to an ORACLE database located
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gregGreg,
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DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
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* Connects to oracle.
* @return Has connection been made?
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}I'm assuming here that "cnn" (I changed the capitalisation..) is a class attribute, since it was not defined within run() in the original code.
You could probably change the last line of connect() to: return (cnn instanceof oracle.jdbc.driver.OracleDriver);This doesn't change the flow of the program (except only registering the oracle driver once) but it should help you debug.
Ben New
[email protected]
Leftclick Software Development
http://www.leftclick.com.au/ -
System crash during database extension
Hello!
Unfortunatly we experienced a system crash during database extension. The new datafile (DISKD0013) was only partly (1,4GB of 9GB) created, when the server went down.
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2008-01-22 13:59:26 7246 ERR 11000 page0io_ Illegal file format
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2008-01-22 13:59:26 7214 ERR 3 Admin Database state: OFFLINE
2008-01-22 13:59:26 7214 ERR 6 KernelCo + Internal errorcode, Errorcode 9050 "disk_not_accessible"
2008-01-22 13:59:26 7214 ERR 20017 Admin + RestartFilesystem failed with 'I/O error'
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you can either:
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b) perform a parameterfile recovery using dbmcli (param_restore)
You're okay as long as nothing was written on the new volume.
When using a) you need to make sure you delete all necessary parameter entries belonging to the datavolume (size, type etc.).
When you're restoring to an old parameterfile, you need to make sure the parameterfile's only difference is the datavolume extension as the last change, otherwise you'd possibly reset more than you'd like. To check the parameterhistory, you can for example take a look at the <DBSID>.pah file in the /sapdb/data/config directory.
If you're unsure what to do, i.e. if it's a productive system and you're an SAP customer: open an OSS message.
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Roland
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