Database, XML

How to create XMLIndex? When its worth to use it?

How to create XML index? Very general way with all default applied as follows: create index index_name on table_name (xmltype_column) indextype is xdb.xmlindex; Check the name of PATH table select path_table_name from user_xml_indexes  where table_name = ‘table_name’ and index_name = ‘index_name’;  Check what secondary indexes are used select c.index_name, c.column_name, c.column_position, e.column_expression  from user_ind_columns c left outer join user_ind_expressions e…

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Database, Logging, PL/SQL, SQL

How to enable tracing in Oracle DB? How to read trace files?

There are many ways to enable tracing in Oracle DB, some are legacy and deprecated. One of latest and recommended method for 11gR2 – use of DBMS_MONITOR (find out more about it in Oracle reference) package. To enable whole instance tracing: execute dbms_monitor.database_trace_enable(waits => true, binds => true,  instance_name => ‘instance_name’); To disable whole instance tracing:  execute dbms_monitor.database_trace_disable(instance_name => ‘instance_name’);…

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