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Posted to derby-dev@db.apache.org by "Kathey Marsden (Updated) (JIRA)" <ji...@apache.org> on 2011/12/07 21:18:40 UTC
[jira] [Updated] (DERBY-5473) Index growth can occur with update of
ever increasing values
[ https://issues.apache.org/jira/browse/DERBY-5473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kathey Marsden updated DERBY-5473:
----------------------------------
Urgency: Normal
Affects Version/s: 10.9.0.0
10.8.2.3
10.7.1.4
10.6.2.3
10.5.3.2
> Index growth can occur with update of ever increasing values
> -------------------------------------------------------------
>
> Key: DERBY-5473
> URL: https://issues.apache.org/jira/browse/DERBY-5473
> Project: Derby
> Issue Type: Bug
> Components: Store
> Affects Versions: 10.5.3.2, 10.6.2.3, 10.7.1.4, 10.8.2.3, 10.9.0.0
> Reporter: Kathey Marsden
> Labels: derby_triage10_9
> Attachments: ReproIdxGrowth.java
>
>
> On a table with an BIGINT Index that is updated quickly with every increasing values the index can grow and space not be reclaimed.
> Attaching a reproduction for this issue ReproIdxGrowth.
> The program has a single thread that iteratively updates 5 rows in a table with a time value.
> PreparedStatement ps = conn.prepareStatement(
> "UPDATE T SET LAST_SYNC_TIME = ?, NUM_SYNCS = ? WHERE ACCOUNT_ID = ?");
> ResultSet rs = s.executeQuery("SELECT ACCOUNT_ID, NUM_SYNCS FROM T");
> while( rs.next()) {
> int account = rs.getInt(1);
> int prevNumSync = rs.getInt(1);
> ps.setLong(1, new Date().getTime());
> ps.setInt(2,prevNumSync++);
> ps.setInt(3, account);
> ps.executeUpdate();
> }
> After 50,000 iterations we end up with 150 pages allocated for the just the 5 rows, possibly because it cannot get the table lock to rebalance the tree.
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