怎样才可以完全通过 ORACLE8DBA 的考试
hi, little fish
i can share my tips, but i find your website have not the oracle certification.
you can add it. if my tips can help you, tell me.
best regards,
sandy
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how to pass the oracle 8 dba(ocp) exam:
1. get and read the student books from oracle or your friend(12 total), all the content in the books.
2. do the assess exam.(run the attachment file assess.exe to install it).
（download assess.exe）.
3. you can find more information at oracle website.
4. other tips below:
1z0-001 - into to oracle: sql and pl/sql
1.an expr. with null always evaluates to null, except ||, which treats null as
2.comparison to null is always false
3.all functions, except count(*), ignores null values
4.nulls are displayed last with ordered by in oracle8
5.logical evaluation: true takes precedence with or, false with and
6.there are a lot of questions about group by/ having...
7.use where to exclude rows, having to exclude groups from a query
8.know when a cartesian product will be formed. you need a min of n-1 conditions when you join n tables.
9.know the difference between an equi (=), self (must use tab aliases), outer (+) and non-equi (in, etc) join
10.you can only have a subquery in a from/ where/ having clause of a select statement
11.sub-queries and views cannot contain order by
12.a literal is any char/num/expr in a select list that s not a col or col alias
13.min and max are the only functions that can operate on any datatype
14.primary key and unique constraints will implicitly create indexes
15.there is a lot of questions like: 'which line will return an error?'. look for names starting with numbers, invalid constraints, etc.
1z0-013 - oracle8: database administration
1.instance=sga + background processed (not server processes); instance will open a database on disk
2.sga=system global area/ pga=program global area
3.oracle server creates pga as writeable and non-shared/ sga as shared
4.know what background processes are doing in detail, dbwr, smon, pmon, lgwr, etc.
5.smon coalesces adjacent free extents into larger extent
6.server processes executes sql; main phases are parse (setup parse tree=most effective search path), execute (apply parse tree) and fetch (get rows)
7.server configurations: single-task, two-task (dedicated server), mts (shared server)
8.shared server: sql*net2/8 required, one requestq for system, responseq per dispatcher
9.dedicated server: use for batch, connect internal, server manager
10.with shared server session data and cursor state moves to sga, stack space remains in pga
11.no quota means segments cannot grow or be created, only object owner needs quotas.
12.by default a user has no access to any ts
13.if quota=0 no access; -1=unlimited (see view sys.dba_ts_quotas)
14.clusters pre-allocate space/ 2 types: index clusters (stored together for faster join performance) and hush clusters
15.i ve got about 3 questions on index clusters and none about hush clusters
16.sysprivs and roles use with admin option, use with grant option for object privs.
17.revoke a grant...with admin option is not hierarchical and will not cascade, unlike with grant option
18.know how to calculate the size of the n nd extend. initial, next, next := next*(1+pctincrease/100)...
19.pctused is not valid for indexes; optimal is only valid for rollsegs; pctincrease for rollsegs is 0 (cannot be set)
20.there are at least 3 questions about what will happen when pctfree/pctused are increased/decreased
21.maxtrans applies to all blocks; initrans to new blocks only (23 bytes per freelist entry)