149. 如何在某个用户下找所有的索引？
　 select user_indexes.table_name, user_indexes.index_name,uniqueness, column_name
　 from user_ind_columns, user_indexes
　 where user_ind_columns.index_name = user_indexes.index_name
　 and user_ind_columns.table_name = user_indexes.table_name
　 order by user_indexes.table_type, user_indexes.table_name,
　 user_indexes.index_name, column_position;

150. 如何监控 SGA 的命中率？
　 select a.value + b.value "logical_reads", c.value "phys_reads",
　 round(100 * ((a.value+b.value)-c.value) / (a.value+b.value)) "BUFFER HIT RATIO"
　 from v$sysstat a, v$sysstat b, v$sysstat c
　 where a.statistic# = 38 and b.statistic# = 39
　 and c.statistic# = 40;

151. 如何监控 SGA 中字典缓冲区的命中率？
　 select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100 "miss ratio",
　 (1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
　 from v$rowcache
　 where gets+getmisses <>0
　 group by parameter, gets, getmisses;

152. 如何监控 SGA 中共享缓存区的命中率，应该小于1% ？
　 select sum(pins) "Total Pins", sum(reloads) "Total Reloads",
　 sum(reloads)/sum(pins) *100 libcache
　 from v$librarycache;

　 select sum(pinhits-reloads)/sum(pins) "hit radio",sum(reloads)/sum(pins)　　"reload percent"
　 from v$librarycache;

153. 如何显示所有数据库对象的类别和大小？
　 select count(name) num_instances ,type ,sum(source_size) source_size ,
　 sum(parsed_size) parsed_size ,sum(code_size) code_size ,sum(error_size)　　error_size,
　 sum(source_size) +sum(parsed_size) +sum(code_size) +sum(error_size)　　size_required

from dba_object_size
　 group by type order by 2;

154. 监控 SGA 中重做日志缓存区的命中率，应该小于1%
　 SELECT name, gets, misses, immediate_gets, immediate_misses,
　 Decode(gets,0,0,misses/gets*100) ratio1,
　 Decode(immediate_gets+immediate_misses,0,0,
　 immediate_misses/(immediate_gets+immediate_misses)*100) ratio2
　 FROM v$latch WHERE name IN ('redo allocation', 'redo copy');

155. 监控内存和硬盘的排序比率，最好使它小于 .10，增加 sort_area_size
　 SELECT name, value FROM v$sysstat WHERE name IN ('sorts (memory)', 'sorts(disk)');

156. 如何监控当前数据库谁在运行什幺SQL语句？
　 SELECT osuser, username, sql_text from v$session a, v$sqltext b
　 where a.sql_address =b.address order by address, piece;

157. 如何监控字典缓冲区？
　 SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM V$LIBRARYCACHE;
　 SELECT (SUM(GETS - GETMISSES - USAGE - FIXED)) / SUM(GETS) "ROW CACHE" FROM　　V$ROWCACHE;
　 SELECT SUM(PINS) "EXECUTIONS", SUM(RELOADS) "CACHE MISSES WHILE EXECUTING" FROM　　V$LIBRARYCACHE;
　 后者除以前者,此比率小于1%,接近0%为好。

　 SELECT SUM(GETS) "DICTIONARY GETS",SUM(GETMISSES) "DICTIONARY CACHE GET MISSES"
　 FROM V$ROWCACHE

158. 监控 MTS
　 select busy/(busy+idle) "shared servers busy" from v$dispatcher;
　 此值大于0.5时，参数需加大
　 select sum(wait)/sum(totalq) "dispatcher waits" from v$queue where　　type='dispatcher';
　 select count(*) from v$dispatcher;
　 select servers_highwater from v$mts;
　 servers_highwater接近mts_max_servers时，参数需加大

159. 如何知道当前用户的ID号?
　　SQL>SHOW USER;
　　OR
　　SQL>select user from dual;

160. 如何查看碎片程度高的表?
　 SELECT segment_name table_name , COUNT(*) extents
　 FROM dba_segments WHERE owner NOT IN ('SYS', 'SYSTEM') GROUP BY segment_name
　 HAVING COUNT(*) = (SELECT MAX( COUNT(*) ) FROM dba_segments GROUP BY segment_name);

162. 如何知道表在表空间中的存储情况?
　 select segment_name,sum(bytes),count(*) ext_quan from dba_extents where
　 tablespace_name='&tablespace_name' and segment_type='TABLE' group by tablespace_name,segment_name;

163. 如何知道索引在表空间中的存储情况?
　 select segment_name,count(*) from dba_extents where segment_type='INDEX' and owner='&owner'
　 group by segment_name;

164、如何知道使用CPU多的用户session?
　 11是cpu used by this session

　 select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value
　 from v$session a,v$process b,v$sesstat c
　 where c.statistic#=11 and c.sid=a.sid and a.paddr=b.addr order by value desc;

165. 如何知道监听器日志文件?
以8I为例
　 $ORACLE_HOME/NETWORK/LOG/LISTENER.LOG

166. 如何知道监听器参数文件?
　 以8I为例
　 $ORACLE_HOME/NETWORK/ADMIN/LISTENER.ORA

167. 如何知道TNS 连接文件?
　 以8I为例
　 $ORACLE_HOME/NETWORK/ADMIN/TNSNAMES.ORA

168. 如何知道Sql*Net 环境文件?
　 以8I为例
　 $ORACLE_HOME/NETWORK/ADMIN/SQLNET.ORA

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