On 12/22/15, ??? <2004wqg2008 at 163.com> wrote: >>> >pragma mmap_size= 512000000; >>> >Pragma page_size = 8192; >>> >Vacuum; >>> >Pragma cache_size = N; > The above code has nothing to do with the speed of retrieving records, > especially the beginning retrieve records from database. > Is this the right? >
Setting the mmap_size will normally help read performance a lot. However, if you are reading from a ZIPVFS database, the extra layer of decryption and decompression that sits in between the disk and your application will render the mmap_size mote - it won't matter. -- D. Richard Hipp drh at sqlite.org
