It's the same semantics as for files and directories in a filesystem with permissions: A file may be inaccessible to you for writing (i.e. read-only), but if you have read access to its directory you can still delete it. (So if I were Anthony I would ask about making sys.schemas read-only etc.) Eyal On 12/18/2015 03:16 PM, Lefteris wrote:
I was actually asking:) I had not tried it out.
But anyway, i did now,
sql>create table test (a int);
operation successful (28.245ms)
sql>insert into test values(5);
1 affected row (10.268ms)
sql>alter table test set read only;
operation successful (13.967ms)
sql>drop table test;
operation successful (9.252ms)
sql>
It turns out you can drop it even if it does contain data and it is read-only.
I am just trying to figure out if the proposition that a read-only table is not necessarily also a write-protected table is true.
On Fri, Dec 18, 2015 at 2:51 PM, Sjoerd Mullender <sjoerd@acm.org <mailto:sjoerd@acm.org>> wrote:
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On 18/12/15 14:43, Anthony Damico wrote: > you can't drop a table if it contains data? i am confused
Of course you can. Lefteris is confused, I think.
> On Friday, December 18, 2015, Lefteris <lsidir@gmail.com <mailto:lsidir@gmail.com> > <mailto:lsidir@gmail.com <mailto:lsidir@gmail.com>>> wrote: > > Kind of yes, but then again you can not drop any table (not just > the read-only ones) if it contains data. > > On Fri, Dec 18, 2015 at 2:12 PM, Anthony Damico > <ajdamico@gmail.com <mailto:ajdamico@gmail.com> > <javascript:_e(%7B%7D,'cvml','ajdamico@gmail.com <mailto:ajdamico@gmail.com>');>> wrote: > > alright, that seems like a small bug then. if a table has zero > records, it cannot be protected but if it has one record, it can. > thanks all > >https://www.monetdb.org/bugzilla/show_bug.cgi?id=3889 > > > > On Fri, Dec 18, 2015 at 7:59 AM, Lefteris <lsidir@gmail.com <mailto:lsidir@gmail.com> > <javascript:_e(%7B%7D,'cvml','lsidir@gmail.com <mailto:lsidir@gmail.com>');>> wrote: > > It is read-only, not write protected:) > > I am joking, but we use the read-only property to create > non-updatable indeces and perform other optimization that would be > impossible to do if there could be updates, appends, inserts etc. > into the table. > > Now, if the read-only statement means also that you can not drop > the table, that is debatable. > > Trying creating a table, add one row of values, then make it a > read-only and then try to drop it. My bet is it will not be > dropped. Then try to delete the row while the table is still > read-only, you should not be able. > > Lefteris > > > On Fri, Dec 18, 2015 at 1:47 PM, Anthony Damico > <ajdamico@gmail.com <mailto:ajdamico@gmail.com> > <javascript:_e(%7B%7D,'cvml','ajdamico@gmail.com <mailto:ajdamico@gmail.com>');>> wrote: > > dropping it isn't updating it? > > > On Friday, December 18, 2015, Guillaume Savary > <guillaume.savary@securactive.net <mailto:guillaume.savary@securactive.net> > <javascript:_e(%7B%7D,'cvml','guillaume.savary@securactive.net <mailto:guillaume.savary@securactive.net>');>> > > wrote: > > > Le 17/12/2015 20:54, Anthony Damico a écrit : >> sql>create table my_table as select 1 with data; operation >> successful (57.729ms) sql>alter table my_table set read only; >> operation successful (5.488ms) sql>alter table my_table add >> column my_column integer; operation successful (10.563ms) >> sql>drop table my_table; operation successful (6.075ms) > > Doc: "An individual table can be protected using the READ ONLY > mode. All attempts to *update*are flagged as a SQL error." As > youdid not "update" the data, it seems normal I guess. > > -- Guillaume Savary Securactive R&D > > > _______________________________________________ users-list mailing > listusers-list@monetdb.org <mailto:users-list@monetdb.org> > <javascript:_e(%7B%7D,'cvml','users-list@monetdb.org <mailto:users-list@monetdb.org>');> >https://www.monetdb.org/mailman/listinfo/users-list > > > > _______________________________________________ users-list mailing > listusers-list@monetdb.org <mailto:users-list@monetdb.org> > <javascript:_e(%7B%7D,'cvml','users-list@monetdb.org <mailto:users-list@monetdb.org>');> >https://www.monetdb.org/mailman/listinfo/users-list > > > > _______________________________________________ users-list mailing > listusers-list@monetdb.org <mailto:users-list@monetdb.org> > <javascript:_e(%7B%7D,'cvml','users-list@monetdb.org <mailto:users-list@monetdb.org>');> >https://www.monetdb.org/mailman/listinfo/users-list > > > > > _______________________________________________ users-list mailing > listusers-list@monetdb.org <mailto:users-list@monetdb.org> >https://www.monetdb.org/mailman/listinfo/users-list >
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