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set async write to disk to improve speed, eg import * 40

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svn: r16461
This commit is contained in:
Benny Malengier 2011-01-24 20:08:21 +00:00
parent f84de89864
commit 3a4a01ba9e
1 changed files with 11 additions and 4 deletions
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15
src/gen/db/write.py
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@ -393,6 +393,13 @@ class DbBsddb(DbBsddbRead, DbWriteBase, UpdateCallback):
self.set_auto_remove() self.set_auto_remove()
# Set not to flush to disk synchronous, this greatly speeds up
# database changes, but comes at the cause of loss of durability, so
# power loss might cause a need to run db recovery, see BSDDB manual
## NOTE: due to pre 4.8 bsddb bug it is needed to set this flag before
## open of env, #16492 - http://download.oracle.com/docs/cd/E17076_02/html/installation/changelog_4_8.html
self.env.set_flags(db.DB_TXN_WRITE_NOSYNC, 1)
# The DB_PRIVATE flag must go if we ever move to multi-user setup # The DB_PRIVATE flag must go if we ever move to multi-user setup
env_flags = db.DB_CREATE | db.DB_PRIVATE |\ env_flags = db.DB_CREATE | db.DB_PRIVATE |\
db.DB_INIT_MPOOL | db.DB_INIT_LOCK |\ db.DB_INIT_MPOOL | db.DB_INIT_LOCK |\
@ -1585,8 +1592,8 @@ class DbBsddb(DbBsddbRead, DbWriteBase, UpdateCallback):
self.undodb.clear() self.undodb.clear()
self.env.txn_checkpoint() self.env.txn_checkpoint()
if db.version() < (4, 7): #if db.version() < (4, 7):
self.env.set_flags(db.DB_TXN_NOSYNC, 1) # async txn # self.env.set_flags(db.DB_TXN_NOSYNC, 1) # async txn
if self.secondary_connected and not no_magic: if self.secondary_connected and not no_magic:
# Disconnect unneeded secondary indices # Disconnect unneeded secondary indices
@ -1625,8 +1632,8 @@ class DbBsddb(DbBsddbRead, DbWriteBase, UpdateCallback):
""" """
if transaction.batch: if transaction.batch:
self.env.txn_checkpoint() self.env.txn_checkpoint()
if db.version() < (4, 7): #if db.version() < (4, 7):
self.env.set_flags(db.DB_TXN_NOSYNC, 0) # sync txn # self.env.set_flags(db.DB_TXN_NOSYNC, 0) # sync txn
if not transaction.no_magic: if not transaction.no_magic:
# create new secondary indices to replace the ones removed # create new secondary indices to replace the ones removed