Single Tenant duplicates

I recently reported an issue regarding single tenant. In old-time non-cdb, the SID used to be unique on a server. If you connect to srv01:port:sid, then you know where you connect. Unfortunately, this is no longer true. If for instance you have two database sid’s S01 and S02 with a pluggable P01, and both run […]

Monitor audit_file_dest !

Until 11.2, audit_file_dest used to remain small with default settings and reasonably sized and active database. Suddenly, in 12c, you will sooned or later get ORA-09925: Unable to create audit trail file. At that point, no more connection is possible to the database, it is a complete loss of service. Why suddenly in 12c ? […]

old jdbc driver generates ORA-28040

I read on note 401934.1 that Oracle 10gR2 jdbc clients are still supported with Oracle 12c. I have an application using an oracle10gr2 jdbc, and connection to 12c generates ORA-28040. Connection to 11gR2 works like a charm. import java.util.Properties; import java.sql.*; public class O12 { public static void main(String argv[]) throws SQLException { Properties […]

Restricted sqlplus and sql_script

Yesterday I wrote about execute sql script from plsql. Connor then posted a 12c new feature that I overviewed If you are still considering the 11g approach with sqlplus, you should read about restricted sqlplus If you run sqlplus -L -s -R 3 scott/tiger@db01 lot’s of OS-command are disabled SQL> get /etc/passwd SP2-0738: Restricted […]

column width change in 12c

In 11g I used to have 30 characters width in my dictionary SQL> select table_name, column_name from user_tab_columns; TABLE_NAME COLUMN_NAME —————————— —————————— BONUS COMM BONUS SAL BONUS JOB BONUS ENAME DEPT LOC DEPT DNAME DEPT DEPTNO EMP DEPTNO EMP COMM EMP SAL EMP HIREDATE TABLE_NAME COLUMN_NAME —————————— —————————— EMP MGR EMP JOB EMP ENAME EMP […]

anonymous cypher suites for SSL (and a 12c pitfall)

If you configure your listener for encryption only, you do not really need authentication. It works pretty fine until, I wrote multiple posts on ssl. You add SSL_CLIENT_AUTHENTICATION=FALSE to your server sqlnet.ora and listener.ora and specify an “anon” cipher suite in your client. You do not need to validate the certificate, so a default […]

KeepAlive socket in 12c listener

A not uncommon issue with firewalls and listeners are timeouts. Your production database may be behind a firewall, you may connect from a remote location, even your Windows workstation may have some firewall activated, possibly you use ssh tunnels or TCPS. All those occasionally lead to timeouts and connection abortion, for instance ORA-03113 end-of-file on […] on AIX

just released today only in Enterprise Edition at the moment, and now available on HPUX, zLinux and AIX #oracle12c #db12102 is out for a bunch of platform #aix #os390 #hpux #zlinux — laurentsch (@laurentsch) November 17, 2014 This is the first and last patchset for 12cR1 #oracle is the last patch set for […]

to R1 or to R2

In the past, most of my customers skipped R1 releases. That is, 8.1.7 -> 9.2 -> 10.2 -> 11.2. SAP does the same. For the very first time SAP plans to go to + some PSU in spring 2015. But only to avoid running out of support and without any fancy feature like Multitenant […]

select a.b.c.d.e from t a

I just learnt a new syntax. With, you can dive into your JSON document within sql, it looks a bit unusual to me SQL> CREATE TABLE t (b CLOB CHECK (b IS JSON)); Table created. SQL> insert into t(b) values (‘{“c”:{“d”:{“e”:1}}}’); 1 row created. SQL> select a.b.c.d.e from t a; C ———————- 1 Largely […]

ssl version

I wrote about ssl version in jdbc thin yesterday The default version also no longer works for the thick client with 12c client and 11g Server. With 11gR2 : C:> tnsping (DESCRIPTION=(ADDRESS=(PROTOCOL=TCPS)(HOST=SRV01)(PORT=1521))) TNS Ping Utility for 64-bit Windows: Version OK (100 msec) with 12cR1 : C:> tnsping (DESCRIPTION=(ADDRESS=(PROTOCOL=TCPS)(HOST=SRV01)(PORT=1521))) TNS Ping Utility for 64-bit Windows: […]

dotNet transaction guard

also with ODP in 12c, you can check the commit outcome as in jdbc let’s create a table with a deferred primary key create table t (x number primary key deferrable initially deferred); Here an interactive Powershell Demo PS> [Reflection.Assembly]::LoadFile(“C:\oracle\product\12.1.0\dbhome_1\ODP.NET\bin\4\Oracle.DataAccess.dll”) GAC Version Location — ——- ——– True v4.0.30319 C:\Windows\Microsoft.Net\assembly\GAC_64\Oracle.DataAccess\v4.0_4.121.1.0__89b483f429c47342\Oracle.DataAccess.dll I first load the assembly. Some […]

Transaction guard

Getting the logical transaction id in 12c will greatly simplify your error handling and enhance your business continuity in your application. In 11g and below, your java code use to look like try { insert into… } catch () { error_handling() } but one probably assumed the insert failed when it was committed (e.g. database […]

distinct listagg

One limitation in listagg, you cannot use DISTINCT. Okay, there are plenty of distinct-capable listagg workarounds, but to get the real listagg working, it is a bit of an headache With one listagg SELECT DEPTNO, LISTAGG (JOB, ‘,’) WITHIN GROUP (ORDER BY JOB) JOBS FROM ( SELECT DISTINCT DEPTNO, JOB FROM EMP) GROUP BY DEPTNO; […]

Get the secondmax, again

Just bouncing on 2008/07/secondmax. Another way of getting secondmax would be with an ordered collection. While collection methods like (n), first, last, count are not in SQL, I used PLSQL (within SQL) WITH FUNCTION f (c sys.odcinumberlist, n NUMBER) RETURN number IS BEGIN RETURN c (n); END; SELECT f( CAST( COLLECT( CAST( sal AS NUMBER […]

strings larger than 4000 in 12c

Back in Oracle 7, the maximum length for VARCHAR2 was 2000. In 11gR2, it is still 4000 for varchar2/char columns and for literals. Any attempt to use something larger will produce an infamous ora-910, ora-1704 or ora-1489 error. SQL> create table t(x varchar2(5000)); create table t(x varchar2(5000)) * ERROR at line 1: ORA-00910: specified length […]

old-hash, SHA-1, SHA-2/512

Until pretty recently, only the dubious unsalted proprietary algorithm was available to store Oracle passwords. A bunch of tool where at the time able to decode any 6-8 characters in no time, and the rainbow approach was to precalculate all possibles passwords for a specific user. Those time are not really for away, only starting […]

Enterprise Manager command line interface

emcli has been around for a while, but in 12c the installation has never been easier do not search on otn for the jar, go to download with : Setup –>My Preferences –>Command line interface –> download install with : java -jar emclikit.jar client -install_dir=/u01/app/oracle/emcli configure with : emcli setup -url= -username=sysman -password=sysmanpw -dir=/u01/app/oracle/emcli. That’s […]

Ow yes it is a “c” !

Rumours about what would come after 8i (internet) 10g (grid) were around, but now it is official, there will be an Oracle Enterprise Manager 12c Read more : And in the blogosphere