一些常用的SQL 语句 之5

 

19、查看catched object

　　SELECT owner, name, db_link, namespace,

　　type, sharable_mem, loads, executions,

　　locks, pins, kept FROM v$db_object_cache

　　20、查看V$SQLAREA

　　SELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,

　　VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,

　　USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS,

DISK_READS,

　　BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA

　　21、查看object分类数量

　　select decode (o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5

,

　　'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) object_type , count(*) quantity from

　　sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX' , 2,'TABLE' ,

3

　　, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) union

select

　　'COLUMN' , count(*) from sys.col$ union select 'DB LINK' , count(*) from

　　22、按用户查看object种类

　　select u.name schema, sum(decode(o.type#, 1, 1, NULL)) indexes,

　　sum(decode(o.type#, 2, 1, NULL)) tables, sum(decode(o.type#, 3, 1, NULL))

　　clusters, sum(decode(o.type#, 4, 1, NULL)) views, sum(decode(o.type#, 5, 1,

　　NULL)) synonyms, sum(decode(o.type#, 6, 1, NULL)) sequences,

　　sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))

　　others from sys.obj$ o, sys.user$ u where o.type# >= 1 and u.user# =

　　o.owner# and u.name <> 'PUBLIC' group by u.name order by

　　sys.link$ union select 'CONSTRAINT' , count(*) from sys.con$

　　23、有关connection的相关信息

　　1)查看有哪些用户连接

　　select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command),

　　'Action Code #' || to_char(command) ) action, p.program oracle_process,

　　status session_status, s.terminal terminal, s.program program,

　　s.username user_name, s.fixed_table_sequence activity_meter, '' query,

　　0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num

　　from v$session s, v$process p where s.paddr=p.addr and s.type = 'USER'

　　order by s.username, s.osuser

　　2)根据v.sid查看对应连接的资源占用等情况

　　select n.name,

　　v.value,

　　n.class,

　　n.statistic#

　　from v$statname n,

　　v$sesstat v

　　where v.sid = 71 and

　　v.statistic# = n.statistic#

　　order by n.class, n.statistic#

　　3)根据sid查看对应连接正在运行的sql

　　select /*+ PUSH_SUBQ */

　　command_type,

　　sql_text,

　　sharable_mem,

　　persistent_mem,

　　runtime_mem,

　　sorts,

　　version_count,

　　loaded_versions,

　　open_versions,

　　users_opening,

　　executions,

　　users_executing,

　　loads,

　　first_load_time,

　　invalidations,

　　parse_calls,

　　disk_reads,

　　buffer_gets,

　　rows_processed,

　　sysdate start_time,

　　sysdate finish_time,

　　'>' || address sql_address,

　　'N' status

　　from v$sqlarea

　　where address = (select sql_address from v$session where sid = 71)

　　24、查询表空间使用情况select a.tablespace_name "表空间名称",

　　100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用率(%)",

　　round(a.bytes_alloc/1024/1024,2) "容量(M)",

　　round(nvl(b.bytes_free,0)/1024/1024,2) "空闲(M)",

　　round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",

　　Largest "最大扩展段(M)",

　　to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') "采样时间"

　　from (select f.tablespace_name,

　　sum(f.bytes) bytes_alloc,

　　sum(decode(f.autoextensible,'YES',f.maxbytes,'NO',f.bytes)) maxbytes

　　from dba_data_files f

　　group by tablespace_name) a,

　　(select f.tablespace_name,

　　sum(f.bytes) bytes_free

　　from dba_free_space f

　　group by tablespace_name) b,

　　(select round(max(ff.length)*16/1024,2) Largest,

　　ts.name tablespace_name

　　from sys.fet$ ff, sys.file$ tf,sys.ts$ ts

　　where ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#

　　group by ts.name, tf.blocks) c

　　where a.tablespace_name = b.tablespace_name and a.tablespace_name =

c.tablespace_name

　　25、 查询表空间的碎片程度

　　select tablespace_name,count(tablespace_name) from dba_free_space group by

tablespace_name

　　having count(tablespace_name)>10;

　　alter tablespace name coalesce;

　　alter table name deallocate unused;

　　create or replace view ts_blocks_v as

　　select tablespace_name,block_id,bytes,blocks,'free space' segment_name from

dba_free_space

　　union all

　　select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;

　　select * from ts_blocks_v;

　　select tablespace_name,sum(bytes),max(bytes),count(block_id) from

dba_free_space

　　group by tablespace_name;