以下是炼金数据的课程文件总结：
1、prompt <p>检查统计信息是否被收集
--10g
select t.job_name,t.program_name,,t.state,t.enabled
from dba_scheduler_jobs t
where job_name = 'GATHER_STATS_JOB';
--11g
select client_name,status from dba_autotask_client;
select window_next_time,autotask_status from DBA_AUTOTASK_WINDOW_CLIENTS;
2、prompt <p>检查哪些未被收集或者很久没收集(表、分区、子分区）
//查询表
select table_name, blocks, num_rows, last_analyzed
from user_tab_statistics t
where (t.last_analyzed is null or t.last_analyzed < sysdate - 100)
and table_name not like 'BIN$%'
order by last_analyzed ;
//查询分区
select table_name, blocks, num_rows, last_analyzed
from user_tab_partitions t
where (t.last_analyzed is null or t.last_analyzed < sysdate - 100)
and table_name not like 'BIN$%'
order by last_analyzed ;
//查询子分区
select table_name, blocks, num_rows, last_analyzed
from user_tab_subpartitions t
where (t.last_analyzed is null or t.last_analyzed < sysdate - 100)
and table_name not like 'BIN$%'
order by last_analyzed ;
3、查询那些列信息未被收集
prompt <p>检查哪些列很久没被收集统计信息
select t.table_name,
t.column_name,
t.num_distinct,
t.low_value,
t.high_value,
last_analyzed
from user_tab_col_statistics t
where t.last_analyzed < sysdate - 100
and table_name not like 'BIN$%'
order by table_name,last_analyzed;
select t.table_name,
t.column_name,
t.num_distinct,
t.low_value,
t.high_value,
last_analyzed
from user_part_col_statistics t
where t.last_analyzed < sysdate - 100
and table_name not like 'BIN$%'
order by table_name,last_analyzed;
select t.table_name,
t.column_name,
t.num_distinct,
t.low_value,
t.high_value,
last_analyzed
from user_subpart_col_statistics t
where t.last_analyzed < sysdate - 100
and table_name not like 'BIN$%'
order by table_name,last_analyzed;
3、prompt <p>检查哪些索引未被收集或者很久没收集
select t.table_name,
t.index_name,
t.blevel,
t.leaf_blocks,
t.num_rows,
t.last_analyzed
from user_ind_statistics t
where (t.last_analyzed is null or t.last_analyzed < sysdate - 100)
and table_name not like 'BIN$%'
order by table_name,index_name;
4、prompt <p>被收集统计信息的临时表
select table_name,
t.last_analyzed,
t.num_rows,
t.blocks
from user_tables t
where t.temporary = 'Y'
and last_analyzed is not null;