Relationship between multiple cache files

pepak · 09-12-2008, 02:47 AM

Is there any relationship between the three cache files (internal memory cache, MS cache, SD cache)? That is, if I e.g. modify one, should I update the others to keep in sync? Specifically, I am interested in record IDs: Suppose that I have:

- Internal memory cache:

Code:

...
<xs1:text ... id="5" ... />
...

- SD cache:

Code:

...
<text ... id="6" ... />
...

Now I add another document to the internal memory. Do I need to concern myself with IDs in the SD cache or is it enough to make sure that the new ID is unique within the internal memory cache? In other words, if I modify the internal memory cache to:

Code:

...
<xs1:text ... id="5" ... />
<xs1:text ... id="6" ... />
...

Will it have any adverse effects on the same-IDed record in the SD cache? Or vice versa.

kovidgoyal · 09-12-2008, 05:29 AM

depends on the firmware of the reader in question. IIRC, the original firmware on the 500 required the numbers on the storage card databases to always be greater than the largest number in the main memory db. I think the 505 relaxed that requirement, but I'm not a 100% sure. Look at the books.py code in calibre to check.

09-12-2008, 02:47 AM	#1
pepak Guru Posts: 610 Karma: 4150 Join Date: Mar 2008 Device: Sony Reader PRS-T3, Kobo Libra H2O	Relationship between multiple cache files Is there any relationship between the three cache files (internal memory cache, MS cache, SD cache)? That is, if I e.g. modify one, should I update the others to keep in sync? Specifically, I am interested in record IDs: Suppose that I have: - Internal memory cache: Code: ... <xs1:text ... id="5" ... /> ... - SD cache: Code: ... <text ... id="6" ... /> ... Now I add another document to the internal memory. Do I need to concern myself with IDs in the SD cache or is it enough to make sure that the new ID is unique within the internal memory cache? In other words, if I modify the internal memory cache to: Code: ... <xs1:text ... id="5" ... /> <xs1:text ... id="6" ... /> ... Will it have any adverse effects on the same-IDed record in the SD cache? Or vice versa.

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09-12-2008, 05:29 AM	#2
kovidgoyal creator of calibre Posts: 44,380 Karma: 23764838 Join Date: Oct 2006 Location: Mumbai, India Device: Various	depends on the firmware of the reader in question. IIRC, the original firmware on the 500 required the numbers on the storage card databases to always be greater than the largest number in the main memory db. I think the 505 relaxed that requirement, but I'm not a 100% sure. Look at the books.py code in calibre to check.

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