性能检测脚本.docx

1. 监控事例的等待select event,sum(decode(wait_Time,0,0,1)) Prev,?sum(decode(wait_Time,0,1,0)) Curr,count(*) Tot?from v$session_Wait?group by event order by 4;2. 回滚段的争用情况select name, waits, gets, waits/gets Ratio?from v$rollstat a, v$rollname b?where a.usn = b.usn;3. 监控表空间的 I/O 比例select df.tablespace_name name,df.file_name file,f.phyrds pyr,?f.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw?from v$filestat f, dba_data_files df?where f.file# = df.file_id?order by df.tablespace_name;4. 监控文件系统的 I/O 比例select substr(a.file#,1,2) #, substr(,1,30) Name,?a.status, a.bytes, b.phyrds, b.phywrts?from v$datafile a, v$filestat b?where a.file# = b.file#;5.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;6. 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$sysstat c?where a.statistic# = 38 and b.statistic# = 39?and c.statistic# = 40;7. 监控 SGA 中字典缓冲区的命中率select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100 miss ratio,?(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 Hit ratio?from v$rowcache?where gets+getmisses 0?group by parameter, gets, getmisses;8. 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;9. 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