[EMAIL PROTECTED] wrote: > > I have seen the use of the database catalog. > > But i have some question. > > i want to know the database catalog's mechanism.Is it locate in hard > disk?Is it a system table?And the database catalog how to work when > database instance start. >
As the database catalog is part of the database, it is of course stored on hard disk. But it is NOT stored separately from the data (as at least one other database systems stores it). It is stored in that area you specified for the database, the DATADEVICES/DATAVOLUMES, during installation of the database. No special behavior for catalog is used: if info is needed and not already in internal cache, the corresponding page(s) are read from disk into this internal cache, as it is done for every catalog or user data. Elke SAP Labs Berlin > Thanks. > > _________________________________________________________________ > 与联机的朋友进行交流，请使用 MSN Messenger: http://messenger.msn.com/cn > > > -- > MaxDB Discussion Mailing List > For list archives: http://lists.mysql.com/maxdb > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MaxDB Discussion Mailing List For list archives: http://lists.mysql.com/maxdb To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
