[Firebird-devel] gfix -cache = shutdown cache manager

[Dmitry K. <di...@de...>]

Hello, All!

I found lost gfix switch. If I'm crazy or completely wrong - tell me please.
(I tried all the following with 5.6, and got wrong results. I don't understand
why I'm sure that all worked in 5.6).

gfix -cache

gfix's help shows that this switch used to "shutdown cache manager".
And, I remember it worked (I've used it on training to show how much page reads
is made by executing query. Main idea was that -cache clears superserver cache,
and new query will read all needed pages from disk, showing it in isc_database_info
statistics).

Now it doesn't work. Trying to
gfix database.gdb -cache

gives "Invalid switch combination".

Documentation lookup (beta docs 6.0 and release 6.0 docs) showed that
-cache n    Reserved for future implementation.

huh! (looking in to 5.x doc I found the same :-( )

Okay, I'm cool and can look into sources.
aliceswi.h is Ok, and have line

    IN_SW_ALICE_CACHE,		0,	"cache",	sw_cache,
	sw_shut,	0,		FALSE,	30, 0, NULL,

As I understand, sw_shut here indicates that sw_cache is a sub-option
for sw_shut. This is NONSENSE, I think. I can't imagine how -cache can
tie with -shut.

And, really, calling
gfix database.gdb -shut -cache 0
turning database to "shutdown" state. Nothing more.

Of course, because alice.c have

 if (table->in_sw_value & (sw_attach | sw_force | sw_tran | sw_cache))
   { setting number of seconds interval for
     ALICE_data.ua_shutdown_delay}

and

if((switches & sw_shut) && !(switches & ((sw_attach | sw_force | sw_tran |
					sw_cache))))
    ALICE_error (19,0,0,0,0,0); /* msg 19: must specify type of shutdown */


Most funny thing is that structure ALICE_data does not have anything for cache,
and -cache itself does not being processed in any way.

Seems that somebody wiped out part of code and changed another part in a strange way?
Or -cache never worked as a separate option, and I have wrong memories?

-- 
Dmitry Kuzmenko, Epsylon Technologies.