The second problem is that sometimes the interbase does not crash but everyone looses the connection and it is not possible to reconnect (by client, or ibexpert for example). In this case we have to restart the whole server.
-We minimized udf function use as low as possible, changed to newer udfs that support unicode etc.-functions that crash the server (afaik) are guarded that they dont get for example invalid datetimes-We update database server regularely to newest version-also updated client dlls-also updated connection components (IBDAC) + Delphi 11.1-wrote exception tracker in our client software (unfortunately there is only the connection lost error)-regularely check active transactions if something hangs/loops/snapshot creation
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This should make it very clear that properly designed indices are a major influence on performance. What may not be so clear is that the selectivity of an index is only computed for a duplicate index. If the values in the index are changed, i.e. updated, deleted, new ones inserted, it is advised to recompute the selectivity periodically. This would affect only those applications that attach to the database after recomputing. Any existing queries will still be optimized using the old selectivity.
The text is information on tables and indices sorted alphabetically by table name. The most interesting information on a table is the number of data pages and the average fill. The information is usually only relevant for one table. This table should be the main table for the database, one that is read and/or updated constantly. If the average fill is below 60 percent then try backing up and restoring the database. If the average fill is still low then it might be advisable to increase the database page size to the next value.
Multi-generational architecture derives it name from process by which InterBase updates a record. Each time a record is updated or deleted a new copy (generation) of the record is created. Its main benefit is that writers do not block readers. This means you can run a single query for weeks while people are updating the database. The answer you get from the query will be consistent with the committed contents of the database when you started your query transaction. How does this work?
Every record in the database is stamped with the transaction number that inserted, updated, or deleted the record. This number is embedded in the record header. When a record is changed, the old version of the record is kept with the old transaction number and the new version gets the transaction number that changed it. The new version of the record has a pointer to the old version of the record. The old version of the record has a pointer to the prior version of it, and so on. There is a mechanism in place to determine how many old versions need to be kept. If necessary, it will keep every version that has been created.
All this is done in the name of performance. When you commit a transaction, the record versions created by operations during that transaction are already written in the database, so only the status of the transaction has to be updated. Thus, commit and rollback are fast. Similarly, when you make a metadata change, InterBase does not change all the data to match the new structure; there may be gigabytes of data to change. Thus, metadata changes are fast.
If you use the BDE for database access for an InterBase 5.x database,
you need to be aware of the following problems introduced in the new BDE
SQL Links DLL that ships with Delphi 6:Problem #1.) "Translate error. Value out of bounds". This occurs if
you are using using IB 5.x client & server.Problem #2.) "General SQL error. Unable to complete network request to
host 'servername'. Error writing date to the connection. An existing
connection was forcibly closed by the remote host.". This occurs if you
are using using IB 6.x client & IB 5.x server.If you use InterBase 5.x server, there is only one Date field type
(DATE). It stores both the date and time. If you want to retreive data
for a specific date (ignoring the time portion of the field) in a
parameterized query, you would probably use AsDate. You might have code
that looks like this:
Query1.ParamByName('DATEWORKED').AsDate := DateTimePicker1.DateTime;
If you use AsDate, you will get one of the above mentioned errors if you
use the new BDE SQL Links DLL that shipped with Delphi 6.If you install the new BDE SQL Links DLL and are using InterBase *5.x*
client and InterBase 5.x server, you will get the following error:
"Translate error. Value out of bounds".If you install the new BDE SQL Links DLL and while you are at it, happen
to install the InterBase *6* client (which someone would probably do if
they installed Delphi 6), you potentially have a serious problem if you
have an InterBase 5.x server. The user that updated their BDE and IB
client will see the following error: "General SQL error. Unable to
complete network request to host 'servername'. Error writing date to
the connection. An existing connection was forcibly closed by the remote
host.". When you get this error, you have lost your database connection
and will most likely have to kill the executable to shut it down. Ok,
so one user gets an error, no big deal. But that isn't the case. The
next time any user that was connected to any database on that server
tries to access the database, they will get the same error as well.
Yes, ALL USERS CONNECTED TO ALL DATABASES ON THAT IB 5.x SERVER WILL GET
THE SAME ERROR AND BE DISCONNECTED FROM THE DATABASE.I know of two people in addition to myself that have code that does
exactly this same thing, so I have a feeling it is a common practice
when using InterBase and the BDE. Both of these problems have been
reported to Borland.Borland's so called "solution" is the first one is to use AsDateTime.
AsDateTime returns the time portion and can give inaccurate query
results due to the various values of the time portion of the field
(that's why we are using AsDate to begin with). So, IMHO, that isn't a
solution. Even if it was, the result requires that you update your
program because of Borland's bug.Borland's response to the second (and more serious problem) is that
InterBase does not support mismatched client and server versions, so
they aren't going to do anything to address it.In my case, how am I going to prevent the 8,000 InterBase 5.x users that
we have deployed from having one user somewhere update the BDE.
Answer: I won't be able to. Since IB 6 is now out and there are many
other applications using IB 6, there is a good chance that someone will
update both the BDE and IB client and will have all users get
disconnected from the database.What's worse is that this isn't even really an InterBase problem, it's a
BDE problem. IMHO, the BDE team needs to update the BDE SQL Links DLL
for InterBase to resolve this problem. At this point, I see no
indication that Borland is the least bit interested in doing this, so I
decided I'd at least post this message so everyone is familiar with the
problem.I haven't had time to test with IB 6, so I'm not sure if this is a
problem with IB 6/Dialect 1 or not.David R. Robinson
Director of Development
Sage U.S. Holdings, Inc.InterBase Installation Info - I have a sample Delphi project and small database that can be
easily used to reproduce the problem if anyone is interested.
This is a real issue. Administrators need to know that a server and
all clients which use it need to be updated together. Your program
should work fine against a 6.x server (our software, which at present
only "officially" supports 5.6 works without modification on a 6.x
server). Your problem, as I see it, is not that someone might update
the BDE, but that someone might update the BDE *and* IB client, without
also updating IB server.As InterBase becomes more popular, this is going to be a support issue
for those of us whose products are based upon IB. I am glad that
Borland fixed the ODS-9 compatibility issue in IB 6, because now we can
tell people to update to v6 if they have even one app which requires it
without breaking 5.6-based apps.Firebird could be a real problem here as I don't believe it can coexist
with IB.
I agree that don't normally expect mismatched versions of the
client/server to work perfectly. However, you also don't expect that if
one user happens to install D6 and IB 6 that all users on any database
on that server will be disconnnected either. :) The problem isn't an
InterBase problem, it's a BDE problem and can be resolved if the SQL
Links InterBase DLL was updated. IB works fine with IB 6 client and IB
5.x server.
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