Re: [sqlite] What's the level of B+-Tree ?

ximum number of cells is expected to get increased and the depth of the Btree will shrink. Is this correct ? Thanks & Best Regards, James From: sqlite-users on behalf of Richard Hipp Sent: Saturday, August 12, 2017 1:57 To: SQLite mailing list Subject: Re:

Re: [sqlite] What's the level of B+-Tree ?

On 8/11/17, Scott Robison wrote: > My understanding is that SQLite doesn't use the traditional definition of > b-tree because it doesn't use fixed size records/keys. It will cram as few > or as many as possible. Correct. More records crammed into one page means that fewer pages need to be read,

Re: [sqlite] What's the level of B+-Tree ?

On 11 Aug 2017, at 4:16pm, james ni wrote: > Yes, yes, that's what I'm seeking What is it that you’re ultimately trying to do with this information ? Are you doing research on the file format for forensic purposes ? Are you trying to edit the database file without using the SQLite libr

Re: [sqlite] What's the level of B+-Tree ?

9:16 AM, "james ni" wrote: > Yes, yes, that's what I'm seeking > > > From: sqlite-users on > behalf of R Smith > Sent: Friday, August 11, 2017 18:25 > To: sqlite-users@mailinglists.sqlite.org > Subject: Re: [sqlite]

Re: [sqlite] What's the level of B+-Tree ?

Yes, yes, that's what I'm seeking From: sqlite-users on behalf of R Smith Sent: Friday, August 11, 2017 18:25 To: sqlite-users@mailinglists.sqlite.org Subject: Re: [sqlite] What's the level of B+-Tree ? On 2017/08/11 11:08 AM, Clemen

Re: [sqlite] What's the level of B+-Tree ?

On 11 August 2017 11:08:02 GMT+01:00, james ni wrote: >Maybe we are talking the different thing. > > >Background of my problem: > >1, When one table grows larger, I found the INSERT speed is becoming >slower and slower; It seems to me that you may have chosen to view the problem from an angle whi

Re: [sqlite] What's the level of B+-Tree ?

On 2017/08/11 11:08 AM, Clemens Ladisch wrote: james ni wrote: As in the example that I provided, there are 4 cells in a single btree page. So there must be some mechanism to determine hoe many keys that one cell can own. I want to know exactly the very value and just how to change the value t

Re: [sqlite] What's the level of B+-Tree ?

james ni wrote: > the INSERT speed is becoming slower and slower; > > the number of syscalls are increasing quickly; Insert the largest values last. Increase the cache size: . Decrease the amount of data stored in the index. (This is unlikely

Re: [sqlite] What's the level of B+-Tree ?

017 18:08 To: SQLite mailing list Subject: Re: [sqlite] What's the level of B+-Tree ? Maybe we are talking the different thing. Background of my problem: 1, When one table grows larger, I found the INSERT speed is becoming slower and slower; 2, My task is to make it not so slower; 3, The

Re: [sqlite] What's the level of B+-Tree ?

know. From: sqlite-users on behalf of Rowan Worth Sent: Friday, August 11, 2017 17:09 To: SQLite mailing list Subject: Re: [sqlite] What's the level of B+-Tree ? Jump to the byte offset specified by the "start of the cell content" header, which comes just after

Re: [sqlite] What's the level of B+-Tree ?

ly the very value and just how to change the value to > a larger one, for example, 256, 512, or even larger. > > > From: sqlite-users on > behalf of Hick Gunter > Sent: Friday, August 11, 2017 16:31 > To: 'SQLite mailing list' > Su

Re: [sqlite] What's the level of B+-Tree ?

james ni wrote: > As in the example that I provided, there are 4 cells in a single btree > page. So there must be some mechanism to determine hoe many keys that > one cell can own. One key per cell: | Within an interior b-tree page, each key and the pointer to its | immediate left are combined int

Re: [sqlite] What's the level of B+-Tree ?

, for example, 256, 512, or even larger. From: sqlite-users on behalf of Hick Gunter Sent: Friday, August 11, 2017 16:31 To: 'SQLite mailing list' Subject: Re: [sqlite] What's the level of B+-Tree ? The number of keys in an sqlite index page depend

Re: [sqlite] What's the level of B+-Tree ?

The number of keys in an sqlite index page depends on the size of the database pages and the size of the (compressed) key value, which is stored in the same "row format" as the data. Child segment pointers are stored at the beginning of the page and key contents are stored at the end. The page

Re: [sqlite] What's the level of B+-Tree ?

found there are plenty of disk IO access during INSERT when one table grows larger. So I suspect the value of "n" should be much smaller. From: sqlite-users on behalf of Clemens Ladisch Sent: Friday, August 11, 2017 14:41 To: sqlite-users@mailinglists

Re: [sqlite] What's the level of B+-Tree ?

ni james wrote: > In the "SQLite File Format" document, the BTree layout is described, > but now I want to know how to get the BTree level (which is the 'K' > value mentioned in the Documentation)? At the end of section 1.5, a "K" is defined. But I don't think that is the same K. Anyway, the doc