2014 in review

The WordPress.com stats helper monkeys prepared a 2014 annual report for this blog. Here’s an excerpt: A New York City subway train holds 1,200 people. This blog was viewed about 4,400 times in 2014. If it were a NYC subway train, it would take about 4 trips to carry that […]

IMPDP with network_link option fails with ORA-39126, ORA-06502, ORA-39127, ORA-44002

Some day before while performing import operation using IMPDP using network_link parameter, I came across this issue. My IMPDP command was as given below: impdp directory=UAT_DIR network_link=MIGRATION_DB_LINK parallel=8 full=y logfile=migration_UATDB_27nov.log exclude=SCHEMA:”in (‘SCOTT’,’ORACLE_OCM’,’XS$NULL’,’MDDATA’,’DIP’,’APEX_PUBLIC_USER’,’SPATIAL_CSW_ADMIN_USR’,’SPATIAL_WFS_ADMIN_USR’,’DMSYS’,’DBSNMP’,’FLOWS_FILES’,’MDSYS’,’ORDSYS’,’EXFSYS’,’WMSYS’,’APPQOSSYS’,’APEX_030200′,’OWBSYS_AUDIT’,’ORDDATA’,’CTXSYS’,’ANONYMOUS’,’XDB’,’ORDPLUGINS’,’OWBSYS’,’SI_INFORMTN_SCHEMA’,’OLAPSYS’,’SYS’,’SYSTEM’,’OUTLN’)” I got following error, before it got terminated due to fatal error: Processing object type DATABASE_EXPORT/SCHEMA/PROCACT_SCHEMA ORA-39127: unexpected error […]

ORA-12801: error signaled in parallel query + ORA-04031: unable to allocate 65560 bytes of shared memory (“large pool”)

Yesterday I got request from one of the user saying his job failed giving following error: Severity Timestamp Node Thread Message Code Message ERROR 2014/10/24 02:59:32 PM node-uat-informatika READER_1_1_1 RR_4035 SQL Error [ ORA-12801: error signaled in parallel query server P178, instance rmb-uat-db-gik1:DBGIK1 (1) ORA-12853: insufficient memory for PX buffers: […]

Multiple failed login attempts can cause high number of row cache lock wait events in 11g

From Oracle 11g, there is a new security enhancement that has potential of creating huge performance issues due to failed login attempts through multiple sessions. Yesterday we faced this issue on production database, all application users were complaining about slow performance especially while making new connections with database. After having quick check […]