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Commit b7f2736e authored by Jeff Brown's avatar Jeff Brown
Browse files

Adjust WAL checkpoint interval. 

Currently the auto-checkpoint interval is 1 page, which makes poor
use of WAL and causes additional unnecessary synchronous writes to
the main database file.

Set the checkpoint interval to 100 pages to make better use of WAL
while still avoiding long checkpoint pauses.

Change-Id: Id54ac02406613bb9379d2116d51947de1d7a489c
parent b1ec5ef4

core/res/res/values/config.xml

+9 −3
Original line number Diff line number Diff line
@@ -665,9 +665,15 @@ 
         Choices are: FULL, NORMAL, OFF. -->

    <string name="db_sync_mode">FULL</string>



    <!-- The Write-Ahead Log auto-checkpoint interval in database pages.

         The log is checkpointed automatically whenever it exceeds this many pages. -->

    <integer name="db_wal_autocheckpoint">1</integer>

    <!-- The Write-Ahead Log auto-checkpoint interval in database pages (typically 1 to 4KB).

         The log is checkpointed automatically whenever it exceeds this many pages.

         When a database is reopened, its journal mode is set back to the default

         journal mode, which may cause a checkpoint operation to occur.  Checkpoints

         can also happen at other times when transactions are committed.

         The bigger the WAL file, the longer a checkpoint operation takes, so we try

         to keep the WAL file relatively small to avoid long delays.

         The size of the WAL file is also constrained by 'db_journal_size_limit'. -->

    <integer name="db_wal_autocheckpoint">100</integer>



    <!-- Max space (in MB) allocated to DownloadManager to store the downloaded

         files if they are to be stored in DownloadManager's data dir,