what's difference between vacuum analyze and analyze?

On Thu, Mar 29, 2012 at 2:24 AM, leaf_yxj <leaf_yxj@163.com> wrote:

I was asked to write a security definer function to make other user can issue
vacuum and analyze command? Friends in this community said vacuum doesn't
work inside the function or multi command. How about analyze.  I know vacuum
is something much like oracle shrink which is used to reorganize the space
in the disk.  Analyze is used to collect the statistic info of the table.
Does analyze works in Function or mulit-commands?

There's an easy way to find out. Try it, and see if you get an error back!

http://www.catb.org/~esr/faqs/smart-questions.html

You may find that it isn't possible. If so, you may want to consider a
non-SQL solution; for instance, a shell script that invokes
vacuum/analyze.

Chris Angelico

On 03/28/2012 08:24 AM, leaf_yxj wrote:

I was asked to write a security definer function to make other user can issue
vacuum and analyze command? Friends in this community said vacuum doesn't
work inside the function or multi command. How about analyze. I know vacuum
is something much like oracle shrink which is used to reorganize the space
in the disk. Analyze is used to collect the statistic info of the table.
Does analyze works in Function or mulit-commands?

test=> BEGIN ;
BEGIN
test=> ANALYZE ;
WARNING: skipping "pg_authid" --- only superuser can analyze it
WARNING: skipping "pg_database" --- only superuser can analyze it
WARNING: skipping "pg_db_role_setting" --- only superuser can analyze it
WARNING: skipping "pg_tablespace" --- only superuser can analyze it
WARNING: skipping "pg_pltemplate" --- only superuser can analyze it
WARNING: skipping "pg_auth_members" --- only superuser can analyze it
WARNING: skipping "pg_shdepend" --- only superuser can analyze it
WARNING: skipping "pg_shdescription" --- only superuser can analyze it
ANALYZE
test=> COMMIT ;
COMMIT
test=> BEGIN ;
BEGIN
test=> VACUUM ANALYZE ;

ERROR: VACUUM cannot run inside a transaction block

test=>

For details:

http://www.postgresql.org/docs/9.1/interactive/sql-vacuum.html

http://www.postgresql.org/docs/9.1/interactive/sql-analyze.html

Thanks.

Regards.

Grace

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