Tag: jdbc

Database, Errors and Bugs

ORA-00600: internal error code, arguments: [kghfrempty:ds]

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Hi all,
Annoying thing, just because that sounded veeery unsual to me. I would expect a different error.

I have seen this “[kghfrempty:ds]” in past a couple times, and if you did see it too you may have noticed, this is almost as much generic as the ORA-600 itself. It happens because this is usually in the top of KGH errors in general. Some examples:

1.

kghnerror <- kghfrempty <- kghfrempty_ex <- qerhjFreeSpace
<- qerhjFetch <- qersoProcessULS <- qersoFetch <- opifch2 <- kpoal8
<- opiodr <- kpoodrc <- rpiswu2 <- kpoodr <- upirtrc
<- kpurcsc <- kpufch0 <- kpufch <- OCIStmtFetch2 <- qksanExecSql <- qksanAnalyzeSql

2.

kghfrempty <- kghfrempty_partial <- kghgex <- kghfnd <- kghalo <- kghgex <- kghalf <- ktmrProcessCRClone 
<- ktmbRead <- ktmrget_int <- ktmrget <- kdmsTransGet <- kdst_fetch_imc  <- kdsttgr  <- qertbFetch

And as being it can be related either to analyze bugs (as per stack 1), In-Memory Column Store – IMC (as per stack 2), create views, rollback over cluster, trigger creation, use function based indexes, or several other generic situations (there is no pattern, as you can see).

So what do to if you get this message? Well, generically, read all the MOS notes available and try to match you case. IF you match, pray to have a bug for your current version, or open an SR to either have a backport or start a new investigation.

A few examples of things to check:

  • ALERT: Bug 13605839 ORA-600 [ktbsdp1] ORA-600 [kghfrempty:ds] ORA-600 [kdBlkCheckError]. Corruption in Rollback with Clusterwide Global Transactions in RAC (Doc ID 1527740.1)
  • SQL Analyze Fails with ORA-600[kghfrempty:ds] (Doc ID 2247180.1)
    Bug 21556276 – dataguide createviewonpath hit ora 600 [kghfrempty:ds] (Doc ID 21556276.8)
  • Bug 20878625 – ORA-600[kghfrempty:ds] with IMC enabled (Doc ID 20878625.8)
  • Bug 19212166 – ORA-600 [KGHFREMPTY:DS] With Cache Line Alignment Enabled (Doc ID 19212166.8)
  • Bug 6797925 – ORA-600 [kghfrempty:ds] During Creation Of Trigger In XML Schema (Doc ID 6797925.8)
  • 11.1: ORA-600 [17147] AND [kghfrempty:ds] On Select Using Functional Indexes (Doc ID 884882.1)
  • ORA-600 [kghfrempty:ds] And ORA-600 [kghrcdepth:ds] While Gathering Statistics (Doc ID 1480132.1)

BUUT I just noticed some undocumented scenario causing this and it might help you on fixing this as well.
I noticed I was getting this error for different queries but always from same application. So I addressed a complete review on application layer and noticed the JDBC 7 on this application. Happens we had just upgraded from 12.1 to 19c.

SO, after upgrading jdbc, it started to work again properly and no MOS SR was required. So lesson learned: When you receive this kghfrempty:ds], speacially after migration, also check for your application JDBC version.

For compatibility Matrix: Starting With Oracle JDBC Drivers – Installation, Certification, and More! ( Doc ID 401934.1 )

Hope it helps, cheers!

Application | Middleware | GoldenGate, Database, Linux, Weblogic

IPv6 Formatting for JDBC and SQLPlus

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Hey all!
Seems new right? But it’s available since 11gR2.
Not needed to explain what is IPV6, right? Any questions, go here.

In summary the only thing you need is to enclose the IPv6 address in square brackets. Like this:

For Easy Connect on IPV4:

SQL> connect user/pass@172.23.10.40:1521/GREPORADB
Connected.

 

For Easy Connect on IPV6:

SQL> connect user/pass@[1:95e05a:g0d:da7a:2007]:1521/GREPORADB
Connected.

For JDBC (thin) IPV4:

url="jdbc:oracle:thin:@(DESCRIPTION=
(LOAD_BALANCE=on) (ADDRESS_LIST=
(ADDRESS=(PROTOCOL=TCP)(HOST=172.23.10.40) (PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=172.23.10.41)(PORT=1521)))
(CONNECT_DATA=(SERVICE_NAME=GREPORADB)))"

For JDBC (OCI) IPV4:

url="jdbc:oracle:oci:@(DESCRIPTION=(ADDRESS=
(PROTOCOL=TCP)(HOST=172.23.10.40)(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=GREPORADB)))"

For JDBC (thin) IPV6:

url="jdbc:oracle:thin:@(DESCRIPTION=
(LOAD_BALANCE=on) (ADDRESS_LIST=
(ADDRESS=(PROTOCOL=TCP)(HOST=[1:95e05a:g0d:da7a:2007]) (PORT=1521))
(ADDRESS=(PROTOCOL=TCP)(HOST=[1:95e05a:g0d:da7a:2006])(PORT=1521)))
(CONNECT_DATA=(SERVICE_NAME=GREPORADB)))"

For JDBC (OCI) IPV6:

url="jdbc:oracle:oci:@(DESCRIPTION=(ADDRESS=
(PROTOCOL=TCP)(HOST=[1:95e05a:g0d:da7a:2007])(PORT=1521))
(CONNECT_DATA=(SERVICE_NAME=GREPORADB)))"

As you can imagine, the same applies to your TNSNAMES entries.

Also, according to this, it can be used even for your LISTENER:

LISTENER =
 (DESCRIPTION_LIST =
  (DESCRIPTION =
   (ADDRESS =
    (PROTOCOL = TCP)
    (HOST = [1:95e05a:g0d:da7a:2007])(PORT =1521))
  )
 )

Cheers!

Database, Java | DevOps | APEX | Scripts, Migration | Upgrades | Patching

Upgrade your JDBC and JDK before Upgrade your Database to 12c Version!

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Ok, now it’s everyone upgrading to 12c, right? Thanks God, this version was released in 2013!

But there is some things to be aware when planning an upgrade, specially regarding old applications and legacy. But pay attention! Not all of the requirements are necessary inside database. It’s the case os JDBC version requirement.

The database 12c documentation explicit mentions that JDBC versions 11.1.x and below are not supported anymore. It doesn’t mean that they don’t work, it’s only unsupported and you’ll have no assistance from MOS if you need. It’s better to avoid, right?

Anyway, if you check the JDBC support matrix, if you are in version 11.2 or below you are not supported since August/2015. So the Database 12c is helping you, that don’t have patching policy, to keep on right way. Thanks to Database 12c!

If this is your situation, I highly recommend you to upgrade the directly to JDBC version 7, the last available by now. See JDBC matrix version as:

captura-de-tela-2016-10-22-as-16-59-57

But test! Test in you dev/test/QA environments before upgrading in Production environment!

Why? Because JDBC also have his compatibility matrix. JDBC 7, for example, demands your JDK to be at least in version 7 (released in 2011!). So, it’s needed to be at least in JDK version 6, as you can see below.

captura-de-tela-2016-10-22-as-16-37-18(Click in the image to access the link)

OK doke?

Some interesting links for you:
Verifying a JDBC Client Installation
What are the various supported Oracle database version vs JDBC compliant versions vs JDK version supported?
Checking the Oracle JDBC Driver Version on a Weblogic Server (by Cristóbal Soto)

Matheus.

ODI

ODI 10gR1: Connection to Repository Failed after Database Descriptor Change

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After migrating database to another host, port or SID, the error below started to happen when running a scenario.
“Of course” all mapped connection was right setted on Topology… But environment is complex, it’s possible something is missing…

java.sql.SQLException: Io Exception: The Network Adapter could not establish the connection
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:162)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:274)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:328)
at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:361)
at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:151)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:595)
at com.sunopsis.sql.SnpsConnection.u(SnpsConnection.java)
at com.sunopsis.sql.SnpsConnection.c(SnpsConnection.java)
at com.sunopsis.sql.h.run(h.java)

Ok, so something really is missing… But where?
Try to check this:

More“ODI 10gR1: Connection to Repository Failed after Database Descriptor Change”

Application | Middleware | GoldenGate, Security, Weblogic

Decrypting WebLogic Datasource Password

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Hi Guys,

Today I bring you a script that I use to decrypt datasource passwords and also the password of AdminServer, which is very useful on a daily basis.

The script uses the encrypted password that is found within the datasource configuration files ($DOMAIN_HOME/config/jdbc/*.xml).
To decrypt the AdminServer password is used the encrypted password contained within the boot.properties ($DOMAIN_HOME/servers/AdminServer/security).

Below the script (decryptPassword.py):

#=======================================================================================
# This Script decrypt WebLogic passwords
#
# Usage:
# wlst decryptPassword.py
#
#
#=======================================================================================
import os
import weblogic.security.internal.SerializedSystemIni
import weblogic.security.internal.encryption.ClearOrEncryptedService

def decrypt(domainHomeName, encryptedPwd):
domainHomeAbsolutePath = os.path.abspath(domainHomeName)
encryptionService = weblogic.security.internal.SerializedSystemIni.getEncryptionService(domainHomeAbsolutePath)
ces = weblogic.security.internal.encryption.ClearOrEncryptedService(encryptionService)
clear = ces.decrypt(encryptedPwd)
print "RESULT:" + clear

try:
if len(sys.argv) == 3:
decrypt(sys.argv[1], sys.argv[2])
else:
print "INVALID ARGUMENTS"
print " Usage: java weblogic.WLST decryptPassword.py "
print " Example:"
print " java weblogic.WLST decryptPassword.py D:/Oracle/Middleware/user_projects/domains/base_domain {AES}819R5h3JUS9fAcPmF58p9Wb3swTJxFl0t8NInD/ykkE="
except:
print "Unexpected error: ", sys.exc_info()[0]
dumpStack()
raise

Syntax using: java weblogic.WLST decryptPassword.py $DOMAIN_HOME encrypted_password

Download script here.

For example:
[oracle@app1osbgrepora1l scripts]$ source /oracle/domains/osb_domain/bin/setDomainEnv.sh
[oracle@app1osbgrepora1l osb_domain]$ java weblogic.WLST decryptPassword.py /oracle/domains/osb_domain/ {AES}WdbfYhD1EbVXmIe62hLftef4WtNPvyRDGc1/lsyQ014=
Initializing WebLogic Scripting Tool (WLST) …
Welcome to WebLogic Server Administration Scripting Shell
Type help() for help on available commands
RESULT:OSBPASS123

That’s all for today
Jackson.