Many times Oracle DBA’s are faced with a situation where shutting down the instance with shutdown immediate seems to take infinite time and gives a impression that the session is hung. In most of the cases this is not a hang. Hang can be defined as a scenario when few sessions/processes are waiting on some…
Author: Saurabh Sood
Worked with prestigious Financial Institutions and Product Based MNCs e.g. Swiss Bank (UBS), CitiBank, Qatar Central Bank (QCB), Societe Generale, Oracle Corporation & Dell.
An Oracle DBA who is up-skilling himself to help large enterprises move their data to cloud and get more insights into data to make it useful for them.
Solving ORA-1031 while connecting as “/ as sysdba” :
Many times we see an issue like this: SQL> conn / as sysdba ERROR: ORA-01031: insufficient privileges This is a very common and frequent error that can occur after the new oracle software install or due to some permissions changes at OS level. I will dicuss the approach to solve ORA-1031 error on UNIX environment….
Recovering from ORA-1578 ORA-8103 (Logical Corruption)
1. For ORA-1578: There are two ways in which we can extract the data from a corrupted table: a) Using DBMS_REPAIR.SKIP_CORRUPT_BLOCKS b) Using Event 10231 a) Connect as sysdba user: execute DBMS_REPAIR.SKIP_CORRUPT_BLOCKS(‘<schema_name>’,'<table_name>’); Put the schema name and the table name of the corrupted table. Then issue the following command to craete a new table from…
Physical Corruption: ORA-1578 PART-2
Recovering from physical corruption: 1. Using BMR when RMAN backups are available When small set of blocks are corrupted, Block Media Recovery (BMR) can be used as a recovery technique. The advantage of BMR is that it can be performed without taking the datafiles offline but the block undergoing BMR is not accessible to users….
Physical Corruption: ORA-1578 -Part 1
ORA-1578 is indication of physical block corruption. Oracle computes an internal checksum before fetching the block from disk, when it is about to fetch the block it reads the block header and compare the checksum stored in it. If the checksum mismatches we get ora-1578 error.It indicates that a block is corrupted at hardware level…