|
I
granted select on table to a user. This permission already existed in the
database. The sql statement returned a Grant
succeeded.
I've
read the fine manual and couldn't find any information about regranting a
permission that already existed, so I ran a trace and the results are
below: It appears to me Oracle just updates the objauth$ without checking
if a permission already exists. This shouldn't (should it) cause
fragmentation in the system tablespace since it updates an existing record with
the same information.
grant
select on contract
update
obj$ set obj#=:6,type#=:7,ctime=:8,mtime=:9,stime=:10,status=:11,
dataobj#=:13,flags=:14,oid$=:15 where owner#=:1 and name=:2 and namespace=:3 and(remoteowner=:4 or remoteowner is null and :4 is null)and(linkname=:5 or linkname is null and :5 is null) and(subname=:12 or subname is null and :12 is null) call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.00 0.00 0 0 0 0 Execute 1 0.01 0.01 0 2 1 1 Fetch 0 0.00 0.00 0 0 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 2 0.01 0.01 0 2 1 1 Misses
in library cache during parse: 1
Misses in library cache during execute: 1 Optimizer goal: CHOOSE Parsing user id: SYS (recursive depth: 1) Rows Row Source
Operation
------- --------------------------------------------------- 1 UPDATE OBJ$ 2 INDEX RANGE SCAN (object id 34) ********************************************************************************
update
objauth$ set
option$=decode(option$,null,decode(:1,0,null,:1),option$)
where grantor#=:2 and obj#=:3 and privilege#=:4 and grantee#=:5 and nvl(col#,0)=:6 call
count cpu
elapsed disk
query current
rows
------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 1 0.01 0.01 0 0 0 0 Execute 1 0.00 0.00 0 2 2 1 Fetch 0 0.00 0.00 0 0 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 2 0.01 0.01 0 2 2 1 Misses
in library cache during parse: 1
Misses in library cache during execute: 1 Optimizer goal: CHOOSE Parsing user id: SYS (recursive depth: 1) Rows Row Source
Operation
------- --------------------------------------------------- 1 UPDATE OBJAUTH$ 2 INDEX RANGE SCAN (object id 100) |
