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Overview
| Comment: | Comment typo fixed. No code changes. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
7e68cdab20f50cf776b92b2138bb4aba |
| User & Date: | drh 2018-09-21 19:06:09 |
Context
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2018-09-21
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| 23:41 | Fix harmless compiler warning when compiled with SQLITE_OMIT_AUTHORIZATION. check-in: 50f2fa1953 user: mistachkin tags: trunk | |
| 19:06 | Comment typo fixed. No code changes. check-in: 7e68cdab20 user: drh tags: trunk | |
| 18:43 | Put a limit counter on the query planner that restricts the number of index+constraint options that can be considered for each table in a join. This prevents certain pathological queries from taking up too much time in the query planner. check-in: 8690b5a0cc user: drh tags: trunk | |
Changes
Changes to src/pcache.c.
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 |
** such that p was added to the list more recently than p->pDirtyNext.
** PCache.pDirty points to the first (newest) element in the list and
** pDirtyTail to the last (oldest).
**
** The PCache.pSynced variable is used to optimize searching for a dirty
** page to eject from the cache mid-transaction. It is better to eject
** a page that does not require a journal sync than one that does.
** Therefore, pSynced is maintained to that it *almost* always points
** to either the oldest page in the pDirty/pDirtyTail list that has a
** clear PGHDR_NEED_SYNC flag or to a page that is older than this one
** (so that the right page to eject can be found by following pDirtyPrev
** pointers).
*/
struct PCache {
PgHdr *pDirty, *pDirtyTail; /* List of dirty pages in LRU order */
|
| |
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 |
** such that p was added to the list more recently than p->pDirtyNext.
** PCache.pDirty points to the first (newest) element in the list and
** pDirtyTail to the last (oldest).
**
** The PCache.pSynced variable is used to optimize searching for a dirty
** page to eject from the cache mid-transaction. It is better to eject
** a page that does not require a journal sync than one that does.
** Therefore, pSynced is maintained so that it *almost* always points
** to either the oldest page in the pDirty/pDirtyTail list that has a
** clear PGHDR_NEED_SYNC flag or to a page that is older than this one
** (so that the right page to eject can be found by following pDirtyPrev
** pointers).
*/
struct PCache {
PgHdr *pDirty, *pDirtyTail; /* List of dirty pages in LRU order */
|