Index growth can occur with update of ever increasing values i
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Key: DERBY-5473
URL: https://issues.apache.org/jira/browse/DERBY-5473
Project: Derby
Issue Type: Bug
Components: Store
Reporter: Kathey Marsden
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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