I faced with that errors our 12c database. With those errors MRP process has been stopped at standby database and GAP started to increased

Complete errors are:

Reading datafile '/xxx/datafile/ts_1.dbf' for corruption at rdba: 0x08d6e9fd (file 35, block 1501693)
Reread (file 35, block 1501693) found same corrupt data (logically corrupt)
Sat Jan 18 17:43:50 2020
ERROR: ORA-00756 detected lost write of a data block
Slave exiting with ORA-756 exception
Sat Jan 18 17:43:50 2020
Errors in file /u01/app/oracle/diag/rdbms/sid/sid/trace/sid_pr01_74757.trc:
ORA-00756: recovery detected a lost write of a data block
ORA-10567: Redo is inconsistent with data block (file# 35, block# 1501693, file offset is 3711934464 bytes)
ORA-10564: tablespace TS
ORA-01110: data file 35: '/xxx/datafile/ts_1'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 102109
Sat Jan 18 17:43:50 2020
Recovery Slave PR01 previously exited with exception 756

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Start with Oracle Database 12c says, Oracle said goodbye Database Console which came with Oracle 10gR1 Version

10g was used OC4J and 11g was used weblogic. Also We were using emctl/emca commands to manage those systems.

12c brings a new tool called Database Express.

The DB Express runs entirely with pl/sql code within the XDB schema. It’s XDB that leverages its features to enable a web-based console, and it’s embedded by default in the database.

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I had session at Oracle Modern Cloud Day at 12 Now 2019 in Turkey. We were talking about Oracle Cloud and Cloud technologies.

Many thanks for attendees who joined my presentation.

sunum

If your export size volume is huge than you may need to split export files instead of a single FS. In this case, We need to use the multiple directories feature of EXPDP or IMPDP utility.

By using this feature, We can create multiple dump files in multiple directories and distribute our logical export to different directories on the operating system.

In my case, my DB version in 11.2.0.4 and my os is Linux 6

So here is the demo:

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I faced with that error message our 12c exadata system. Our development team send that error message to dba team.

Complete error message is:

[Error] Execution (1: 1): ORA-29548: Java system class reported: release of classes.bin in the database does not match that of the oracle executable
ORA-06512: at “MDSYS.SDO_JAVA_STP”, line 370
ORA-06512: at “MDSYS.SDO_UTIL”, line 3188
ORA-06512: at “MDSYS.SDO_UTIL”, line 321

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I faced with that error while I was trying to take rman backup to our new NFS mount point.

The complete error message is:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of crosscheck command on ORA_DISK_1 channel at 10/04/2019 20:14:34
ORA-19587: error occurred reading 512 bytes at block number 1
ORA-17500: ODM err:KGNFS READ FAIL:Permission denied
ORA-27041: unable to open file
SVR4 Error: 13: Permission denied
Additional information: 7
ORA-17503: ksfdopn:6 Failed to open file /orabackup_nfs/SASKI_dbfull_20191003_8puddo78_1_1.rman
ORA-17500: ODM err:KGNFS READ FAIL:Permission denied

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I faced that warning message during my restore process from RAC Database with ASM that has been converted or restored to the Standalone Single Instance Non-ASM Database.

I also noticed RMAN is taking significant time than normal restore time.

From the RDBMS alert.log, it is showing continuous following messages.

ASMB started with pid=32, OS id=28124 
WARNING: failed to start ASMB (connection failed) state=0x1 sid=''
WARNING: ASMB exiting with error
Starting background process ASMB

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I faced with this error during trying to create second instance I hit below errors:

1

After investigate issue I have been found below explanation from this link

From link:

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I faced with that error during running DBCA in silent mode. Complete error message is:
ORA-27104: system-defined limits for shared memory was misconfigured

I have been checked all related parameter such as /etc/sysctl.conf & /etc/security/limits.conf

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You may hit this error during connecting your database by using 3th party tools such as Toad etc.

You are hitting this error If the Oracle client was installed using the domain administrator account instead of the local administrator.

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