Hadoop HA namenode example

In earlier versions of hadoop, the namenode was the Achilles heel. While there was the option of failing over to a secondary namenode, this required manual intervention, or heavy scripting at best. Even then, failover wasn’t instantaneous. With Hadoop 0.23…

PURGE DBA_RECYCLEBIN taking a long time

Just check DBA_SEGMENTS for SEGMENT_NAME like ‘BIN%’, and it should be dropping in number… SQL> select count(*) from dba_segments where segment_name like 'BIN%'; COUNT(*) ———- 2307 SQL> select count(*) from dba_segments where segment_name like 'BIN%'; COUNT(*) ———- 2297 SQL> select…