Oracle统计列参考基表col_usage$
收集直方图
dbms_stats.flush_database_monitoring_info
desc dba_tab_columns
select count(*) from dba_tab_columns where owner='SYS' and table_name='EMP1';
Oracle统计列参考基表col_usage$
收集直方图
dbms_stats.flush_database_monitoring_info
desc dba_tab_columns
select count(*) from dba_tab_columns where owner='SYS' and table_name='EMP1';