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Diffstat (limited to 'src/memjournal.c')
| -rw-r--r-- | src/memjournal.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/memjournal.c b/src/memjournal.c index fbfa7cb80..cd8b87d8a 100644 --- a/src/memjournal.c +++ b/src/memjournal.c @@ -13,6 +13,15 @@ ** This file contains code use to implement an in-memory rollback journal. ** The in-memory rollback journal is used to journal transactions for ** ":memory:" databases and when the journal_mode=MEMORY pragma is used. +** +** Update: The in-memory journal is also used to temporarily cache +** smaller journals that are not critical for power-loss recovery. +** For example, statement journals that are not too big will be held +** entirely in memory, thus reducing the number of file I/O calls, and +** more importantly, reducing temporary file creation events. If these +** journals become too large for memory, they are spilled to disk. But +** in the common case, they are usually small and no file I/O needs to +** occur. */ #include "sqliteInt.h" |