Document performance tip for inserts in tuning guide
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Key: DERBY-108
URL: http://nagoya.apache.org/jira/browse/DERBY-108
Project: Derby
Type: Improvement
Components: Documentation
Versions: 10.0.2.1
Reporter: Sunitha Kambhampati
Priority: Minor
Fix For: 10.0.2.2
Need to add this important performance tip in the tuning guide document.
Could probably be added as Tip #8 in http://incubator.apache.org/derby/manuals/tuning/perf20.html#HDRSII-PERF-25864
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Avoid inserts in autocommit mode if possible:
Inserts can be painfully slow in autocommit mode. The reason is that each commit involves
a flush of the log to the disk for each insert statement. The commit will not return until
a physical disk write has been executed.
To speed things up, there are 2 possibilities
- Run in autocommit false mode and execute a number of inserts in one transaction and then
explicitly issue a commit.
- If your application allows an initial load into the table, one can use the import system
procedures to insert data into a table.
http://incubator.apache.org/derby/manuals/tools/tools90.html#HDRSII-IMPORT-57005.
If loading into an empty table using these interfaces, derby will not log the
individual inserts. The reason is recovery understands that a backout of this
operation is an empty table, and the data in the table is forced to
disk before the transaction commits.
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References from derby mailing lists:
http://nagoya.apache.org/eyebrowse/ReadMsg?listName=derby-user@db.apache.org&msgNo=363
http://nagoya.apache.org/eyebrowse/ReadMsg?listId=271&msgNo=335
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