Indexes removed and renamed

[martinwcole]

Re: Indexes removed and renamed

Stan, here is a function I use that will recreate indexes from a table called zindexes I use that has the definitions in a memo field. It tells the user which ones could not be rebuilt/recreated as the tables were in use.

'Date Created: 26-Feb-2011 12:57:48 PM
'Last Updated: 23-Apr-2015 01:09:02 PM
'Created By : martin cole
'Updated By : MARTIN
function indexes_rebuild as L ()
time1=toseconds(time())
on error goto errors
if alltrim(var->masterpassword)=""
end
end if
dim shared is_shadowed as l
if a5.get_master_path() > ""
is_shadowed=.t.
else
is_shadowed=.f.
end if
if is_shadowed=.t.
mpath=a5.get_master_path() + chr(92)
end if
temp=""
datapath = a5.get_path() + chr(92)
dim tp as p
t1=toseconds(time())
t=table.open("zindexes")
n=t.records_get()
m=0
DIM GLOBAL pDlg1 as waitdialog
pDlg1.Set_Title("Please Wait")
pDlg1.Create(1,"Bounce")
pDlg1.Set_Message("Processing Please Wait")
pDlg1.Set_Bottom_Message("")
t.fetch_first()
while .not. t.fetch_eof()
lastuse=toseconds(time())
m=m + 1
pDlg1.Set_Bottom_Message("Processing " + alltrim(str(m)) + " of " + alltrim(str(n)))
temp1=alltrim(t.Tablename)
temp2=alltrim(t.Indexnames)
if table.in_use(temp1)
if temp1="zindexes" .or. temp1="menu"
else
temp=temp + f_upper(temp1) + crlf()
end if
goto next1
end if
tp=create_indexes(temp1,temp2)
ui_yield()
if tp.haserror
temp=temp + f_upper(temp1) + crlf()
end if
if is_shadowed=.t.
file.copy(datapath + temp1 + ".cdx", mpath + temp1 + ".cdx")
file.remove(datapath + temp1 + ".cdx")
ui_yield()
end if
next1:
t.fetch_next()
end while
t.close()
pdlg1.close()
t2=toseconds(time())
t3=t2-t1
if temp=""
time2=toseconds(time())
textindexes.text="Finished - all indexes rebuilt."
ui_beep(UI_CRITICAL_BEEP); ui_yield(); ui_beep(UI_CRITICAL_BEEP)
else
time2=toseconds(time())
ui_beep(UI_CRITICAL_BEEP); ui_yield();ui_beep(UI_CRITICAL_BEEP)
msgbox("Note","" + crlf() + "The following tables were in use and could not be updated:" + crlf() + alltrim(temp) + crlf()\
+ "Find out who is using these files, and ask them to go back to the main menu for about a minute while you "\
+ "rebuild the indexes!",48)
end if
indexes_rebuild=.t.
if a5.Get_Master_Path() > ""
dim temp as c
temp3="hasteststemp,hashydrogentemps,cscreen"
for i=1 to w_count(temp3,",")
temp4=word(temp3,i,",")
mpath=a5.Get_Master_Path()
files=filefind.first(mpath + chr(92) + temp4 + ".*")
WHILE .not. files.eof()
temp=files.name()
temp2=file.filename_parse(temp,"ne")
file.copy(temp,a5.get_path() + chr(92) + temp2)
files.next()
END WHILE
next
end if
time2=toseconds(time())
time3=time2-time1
msgbox("Note","This took " + alltrim(str(time3)) + " seconds.")
end
errors:
indexes_rebuild=.f.
err_msg = error_text_get(error_code_get())
line = error_line_number_get()
script = error_script_get()
ui_msg_box("Error", err_msg+" Error occurred at line "+alltrim(str(line,4,0))+ " in script: "+script)
end
isopen:
temp=temp + f_upper(temp1) + crlf()
1=1
goto next1
end
end function

[CraigSchumacker]

Re: Indexes removed and renamed

What an emotional roller coaster this has been for me.

Thanks, Stan, for your update.

[tiago]

Re: Indexes removed and renamed

Stan, you are right.

Martin, your script answer very well my question about indexes and shadow.

Craig, I am using this script for the query, instead of using indexes (work-around):

dim frm as P
frm = topparent.this
frm:tables:property.filter_expression = "PROP_REF_NO = '" + V_Prop_Ref + "' "
frm:tables:property.query()
frm.show()
frm.activate()

A possible conclusion:
Indexes that are removed are very difficult to detected, why they are removed and what expression can not be evaluated.
(A possible solution would be to inform the user what expression can not be evaluated before Alpha remove an index!! )

Last point:
We detected that a index is removed during database compaction.
Does it mean that we have a record corrupted?
I used a software (DBF Doctor) to check records and after the fix repair, I got less one record.
But in Alpha this record seems ok.
Is there a way do check/repair corrupted dbf files?

Thanks.

[CraigSchumacker]

Re: Indexes removed and renamed

1) Does your dbf have a memo field?

2) After backing up, try duplicating your table, zapping (and packing) the duplicate, and then append in the old table into the new.

If there are any violations, Alpha used to and still may place the violated records into a new table in the adb directory. The table was named Violated.

Any errors? Try renaming the new table as the old one, being careful to keep the old one intact. Any better?

3) Alpha has no tools to repair... And I am skeptical that would solve the issue, since Alpha has pushed the DBF to it's limits in terms of what that foundation can handle.

4) Looking closely at the one record that was removed by your repair tool, can you glean any idea as to why it is being isolated as corrupt?

[David Boomer]

Re: Indexes removed and renamed

I use Cal Locklin's AIMS Index rebuilder (http://www.aimsdc.net/Tips_Funcs/AIMS_Index_Rebuild.htm)...
It has saved me a LOT of grief.

Indexes can get corrupted for many reasons... particularly irritating is when they simply 'disappear' when Alpha deletes them as a result of a query or when applying an index that fails.
Another recommendation: keep index names to <10 characters!