知识大全数据库管理员日常工作中必备的sql列表[3]

Posted 2022-07-16 权限

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　　查看用户的回滚段的信息

　　select s username rn name from v$session s v$transaction t v$rollstat r v$rollname rn　　where s saddr = t ses_addr and t xidusn = r usn and r usn = rn usn

　　生成执行计划

　　explain plan set statement_id= a for & ;

　　查看执行计划

　　select lpad( *(level ))||operation operation options OBJECT_NAME position from plan_table　　start with id= and statement_id= a connect by prior id=parent_id and statement_id= a

　　查看内存中存的使用

　　select decode(greatest(class ) decode(class Data Sort Header to_char(class)) Rollback ) Class 　　sum(decode(bitand(flag ) )) Not Dirty sum(decode(bitand(flag ) )) Dirty 　　sum(dirty_queue) On Dirty count(*) Total 　　from x$bh group by decode(greatest(class ) decode(class Data Sort Header to_char(class)) Rollback );

　　查看表空间状态

　　select tablespace_name extent_management segment_space_management from dba_tablespaces;　　select table_name freelists freelist_groups from user_tables;

　　查看系统请求情况

　　SELECT DECODE (name summed dirty write queue length value)/　　DECODE (name write requests value) Write Request Length 　　FROM v$sysstat WHERE name IN ( summed dirty queue length write requests ) and value> ;

　　计算data buffer命中率

　　select a value + b value logical_reads c value phys_reads 　　round( * ((a value+b value) c value) / (a value+b value)) BUFFER HIT RATIO 　　from v$sysstat a v$sysstat b v$sysstat c　　where a statistic# = and b statistic# = and c statistic# = ;　　SELECT name ( (physical_reads/(db_block_gets+consistent_gets)))* H_RATIO FROM v$buffer_pool_statistics;

　　查看内存使用情况

　　select least(max(b value)/( * ) sum(a bytes)/( * )) shared_pool_used 　　max(b value)/( * ) shared_pool_size greatest(max(b value)/( * ) sum(a bytes)/( * )) 　　(sum(a bytes)/( * )) shared_pool_avail ((sum(a bytes)/( * ))/(max(b value)/( * )))* avail_pool_pct　　from v$sgastat a v$parameter b where (a pool= shared pool and a name not in ( free memory )) and b name= shared_pool_size ;

　　查看用户使用内存情况

　　select username sum(sharable_mem) sum(persistent_mem) sum(runtime_mem)　　from sys v_$sqlarea a dba_users b　　where a parsing_user_id = b user_id group by username;

　　查看对象的缓存情况

　　select OWNER NAMESPACE TYPE NAME SHARABLE_MEM LOADS EXECUTIONS LOCKS PINS KEPT　　from v$db_object_cache where type not in ( NOT LOADED NON EXISTENT VIEW TABLE SEQUENCE )　　and executions> and loads> and kept= NO order by owner namespace type executions desc;　　select type count(*) from v$db_object_cache group by type;

　　查看库缓存命中率

　　select namespace gets gethitratio* gethitratio pins pinhitratio* pinhitratio RELOADS INVALIDATIONS from v$librarycache

　　查看某些用户的hash

　　select a username count(b hash_value) total_hash count(b hash_value) count(unique(b hash_value)) same_hash 　　(count(unique(b hash_value))/count(b hash_value))* u_hash_ratio　　from dba_users a v$sqlarea b where a user_id=b parsing_user_id group by a username;

　　查看字典命中率

　　select (sum(getmisses)/sum(gets)) ratio from v$rowcache;

　　查看undo段的使用情况

　　SELECT d segment_name extents optsize shrinks aveshrink aveactive d status　　FROM v$rollname n v$rollstat s dba_rollback_segs d　　WHERE d segment_id=n usn(+) and d segment_id=s usn(+);

　　无效的对象

　　select owner object_type object_name from dba_objects where status= INVALID ;　　select constraint_name table_name from dba_constraints where status= INVALID ;

　　求出某个进程并对它进行跟踪

　　select s sid s serial# from v$session s v$process p where s paddr=p addr and p spid=& ;　　exec dbms_system SET_SQL_TRACE_IN_SESSION(& & true);　　exec dbms_system SET_SQL_TRACE_IN_SESSION(& & false);

　　求出锁定的对象

　　select do object_name session_id process locked_mode　　from v$locked_object lo dba_objects do where lo object_id=do object_id;

　　求当前session的跟踪文件

　　SELECT p value || / || p value || _ora_ || p spid || ora filename　　FROM v$process p v$session s v$parameter p v$parameter p 　　WHERE p name = user_dump_dest AND p name = instance_name 　　AND p addr = s paddr AND s audsid = USERENV( SESSIONID ) AND p background is null AND instr(p program CJQ ) = ;

　　求对象所在的文件及块号

　　select segment_name header_file header_block　　from dba_segments where segment_name like & ;

　　求对象发生事务时回退段及块号

　　select a segment_name a header_file a header_block　　from dba_segments a dba_rollback_segs b　　where a segment_name=b segment_name and b segment_id= &

　　 i的在线重定义表

　　/*如果在线重定义的表没有主键需要创建主键*/　　exec dbms_redefinition can_redef_table( cybercafe announcement );　　create table anno as select * from announcement　　exec dbms_redefinition start_redef_table( cybercafe announcement anno );　　exec dbms_redefinition sync_interim_table( cybercafe announcement anno );　　exec dbms_redefinition finish_redef_table( cybercafe announcement anno );　　drop table anno 　　exec dbms_redefinition abort_redef_table( cybercafe announcement anno );

　　常用的logmnr脚本(cybercafe)

　　exec sys dbms_logmnr_d build(dictionary_filename => esal dictionary_location => /home/oracle/logmnr );　　exec sys dbms_logmnr add_logfile(logfilename=> /home/oracle/oradata/esal/archive/ _ dbf ptions=>sys dbms_logmnr new);　　exec sys dbms_logmnr add_logfile(logfilename=> /home/oracle/oradata/esal/archive/ _ dbf ptions=>sys dbms_logmnr addfile);　　exec sys dbms_logmnr add_logfile(logfilename=> /home/oracle/oradata/esal/archive/ _ dbf ptions=>sys dbms_logmnr addfile);　　exec sys dbms_logmnr add_logfile(logfilename=> /home/oracle/oradata/esal/archive/ _ dbf ptions=>sys dbms_logmnr addfile);　　exec sys dbms_logmnr start_logmnr(dictfilename=> /home/oracle/logmnr/esal ora );　　create table logmnr as select * from v$logmnr_contents;

　　与权限相关的字典

　　ALL_COL_PRIVS表示列上的授权用户和PUBLIC是被授予者　　ALL_COL_PRIVS_MADE表示列上的授权用户是属主和被授予者　　ALL_COL_RECD表示列上的授权用户和PUBLIC是被授予者　　ALL_TAB_PRIVS表示对象上的授权用户是PUBLIC或被授予者或用户是属主　　ALL_TAB_PRIVS_MADE表示对象上的权限用户是属主或授予者　　ALL_TAB_PRIVS_RECD表示对象上的权限用户是PUBLIC或被授予者　　DBA_COL_PRIVS数据库列上的所有授权　　DBA_ROLE_PRIVS显示已授予用户或其他角色的角色　　DBA_SYS_PRIVS已授予用户或角色的系统权限　　DBA_TAB_PRIVS数据库对象上的所有权限　　ROLE_ROLE_PRIVS显示已授予用户的角色　　ROLE_SYS_PRIVS显示通过角色授予用户的系统权限　　ROLE_TAB_PRIVS显示通过角色授予用户的对象权限　　SESSION_PRIVS显示用户现在可利用的所有系统权限　　USER_COL_PRIVS显示列上的权限用户是属主授予者或被授予者　　USER_COL_PRIVS_MADE显示列上已授予的权限用户是属主或授予者　　USER_COL_PRIVS_RECD显示列上已授予的权限用户是属主或被授予者　　USER_ROLE_PRIVS显示已授予给用户的所有角色　　USER_SYS_PRIVS显示已授予给用户的所有系统权限　　USER_TAB_PRIVS显示已授予给用户的所有对象权限　　USER_TAB_PRIVS_MADE显示已授予给其他用户的对象权限用户是属主　　USER_TAB_PRIVS_RECD显示已授予给其他用户的对象权限用户是被授予者

　　如何用dbms_stats分析表及模式？

　　exec dbms_stats gather_schema_stats(ownname=> &USER_NAME estimate_percent=>dbms_stats auto_sample_size 　　method_opt => for all columns size auto degree=> DBMS_STATS DEFAULT_DEGREE);　　exec dbms_stats gather_schema_stats(ownname=> &USER_NAME estimate_percent=>dbms_stats auto_sample_size cascade=>true);　　/*　　FOR ALL [INDEXED | HIDDEN] COLUMNS [size_clause]　　FOR COLUMNS [size clause] column|attribute [size_clause] [ column|attribute [size_clause] ] 　　where size_clause is defined as size_clause := SIZE integer | REPEAT | AUTO | SKEWONLY　　integer Number of histogram buckets Must be in the range [ ] 　　REPEAT Collects histograms only on the columns that already have histograms 　　AUTO Oracle determines the columns to collect histograms based on data distribution and the workload of the columns 　　SKEWONLY Oracle determines the columns to collect histograms based on the data distribution of the columns　　*/

cha138/Article/program/SQL/201311/16148

知识大全 数据库管理员日常工作中必备的sql列表[3]

知识大全数据库管理员日常工作中必备的sql列表[3]