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Developer's Report: Firebird Core Development
March to September 2011

March 2011

TRUNK
  • Additional patches for CORE-3362 : Cursors should ignore changes made by the same statement
  • Front ported fix for bug CORE-3328 : Client writes error messages into firebird.log when database is shutted down
  • Fixed bug CORE-3389 : isc_dsql_exec_immed2 with zero transaction handle could lead to a BUGCHECK(147).
  • Fixed bug CORE-3394 : Failed attempt to violate unique constraint could leave unneeded "lock conflict" error in status-vector
  • Fixed broken XNET. Abnormal client disconnection was not released port and resources
  • Improvement CORE-3399 : Allow write operations to temporary tables in read only transactions
  • Frontported improvement CORE-3413 : Improve diagnostics of internal trace errors
  • Fixed bug CORE-3418 : Inactive DB-trigger after Create/Alter Is Active
  • Fixed bug CORE-3419 : Recurse leads to hangs/crash server
  • Regularly update Windows builds and some small fixes
B2_5_Release
  • Fixed bug CORE-3328 : Client writes error messages into firebird.log when database is shut down
  • Fixed bug CORE-3389 : isc_dsql_exec_immed2 with zero transaction handle could lead to a BUGCHECK(147)
  • Fixed bug CORE-3394 : Failed attempt to violate unique constraint could leave unneeded "lock conflict" error in status-vector.
  • Improvement CORE-3399 : Allow write operations to temporary tables in read only transactions
  • Improvement CORE-3413 : Improve diagnostics of internal trace errors
  • Fixed bug CORE-3418 : Inactive DB-trigger after Create/Alter Is Active
  • Fixed bug CORE-3419 : Recurse leads to hangs/crash server
B2_1_Release
  • Fixed bug CORE-3394 : Failed attempt to violate unique constraint could leave unneeded "lock conflict" error in status-vector.
  • Fixed bug CORE-3418 : Inactive DB-trigger after Create/Alter Is Active
April 2011

TRUNK
  • Avoid AV when system requests are released at database shutdown
  • Let config file detects literals "true", "yes" and "y" as TRUE boolean values.
  • Fixed bug CORE-3440 : AV in engine if isc_que_events queued 0 events
  • Frontported fix for regression introduced by me in patch for CORE-3326 - too many unnecessary calls of ISC_check_process_existence().
  • Added defines to switch usage of fast mutex off if necessary.
  • Preparing for the shared page cache : new sync objects ported from Vulcan
  • Regularly update Windows builds and some small fixes
B2_5_Release
  • Fixed bug CORE-3440 : AV in engine if isc_que_events queued 0 events
  • Attempt to fix bug CORE-3387 : Server and client are connected, but server not anwser to client and client is waiting indefinitely for server answer !
  • Fixed regression introduced by me in patch for CORE-3326 - too many unnecessary calls of ISC_check_process_existence().
  • Added defines to switch usage of fast mutex off if necessary.
B2_1_Release
  • Fixed bug CORE-3440 : AV in engine if isc_que_events queued 0 events
B2_0_Release
  • Fixed bug CORE-3440 : AV in engine if isc_que_events queued 0 events
May 2011

TRUNK
  • Fixed bug CORE-3464 : Dirty page could be written without releasing (or downgrading) page lock.
  • Fixed bug CORE-3465 : Nbackup state lock could be not released after cache error.
  • Fixed bug CORE-3466 : Some changes could be lost during the merge of delta file into main database file.
  • Fixed bug CORE-3468 : Attempt to read after the end of file when nbackup state is stalled
  • Fixed bug CORE-3502 : DROP VIEW ignores the existing non-column dependencies
  • Fixed bug CORE-3503 : ALTER VIEW crashes the server if the new version has an artificial (aggregate or union) stream at the position of a regular context in the older
  • Shared page cache implementation
  • Enabled background threads (garbage collector and cache writer).
  • Introduced special kind of system attachments used in this threads and show its activity in monitoring.
  • Regularly update Windows builds and some small fixes
B2_5_Release
  • Backported fix for bug CORE-3464 : Dirty page could be written without releasing (or downgrading) page lock. It results in "lock denied" or "lock conversion denied" bugcheck
  • Backported fix for bug CORE-3465 : Nbackup state lock could be not released after cache error. It results in "Can't lock state for write" bugcheck when backup state is going to be changed.
  • Backported fix for bug CORE-3466 : Some changes could be lost during the merge of delta file into main database file
  • Backported fix for bug CORE-3468 : Attempt to read after the end of file when nbackup state is stalled
June 2011

TRUNK
  • Fixed bug CORE-3515 : Index corruption. Validation put "missing entries" message into firebird.log
  • Fixed bug CORE-3521 : Delta file contents is not flushed to disk
  • Try to correctly handle IO errors in cache and avoid some internal deadlocks.
  • Fixed bug CORE-3525 : Autonomous transactions should not inherit run-time flags of "parent" transaction
  • Fixed bug CORE-3535 : Write target of dirty page could be undefined if error happens when nbackup state is changed.
    • Also prevent overwriting of first page of allocation table by data page contents.
  • Unregistered bug : Delete deferred work when savepoint is cleaned up after failure even if no records was modified. Else DFW task will be repeated at commit making system tables logically inconsistent.
  • Improvement CORE-3536 : Garbage collection in GTT is unnecessary delayed by active transactions in another attachments
  • Improvement CORE-3537 : There is no need to undo changes made in GTT created with ON COMMIT DELETE ROWS option when transaction is rolled back.
  • Regularly update Windows builds and some small fixes
B2_5_Release
  • Fixed bug CORE-3515 : Index corruption. Validation put "missing entries" message into firebird.log
  • Backported fix for bug CORE-3502 : DROP VIEW ignores the existing non-column dependencies, and
    Backported fix for bug CORE-3503 : ALTER VIEW crashes the server if the new version has an artificial (aggregate or union) stream at the position of a regular context in the older version.
  • Fixed bug CORE-3525 : Autonomous transactions should not inherit run-time flags of "parent" transaction
  • Backport fix for bug CORE-3521 : Delta file contents is not flushed to disk
  • Fixed bug CORE-3524 : Compiling stored procedure while in use shutdown database
  • Fixed bug CORE-3535 : Write target of dirty page could be undefined if error happens when nbackup state is changed.
  • Backported : don't try to undo changes when invalidated transaction is rolled back. I.e. force rollback via TIP if transaction was invalidated.
  • Unregistered bug : Delete deferred work when savepoint is cleaned up after failure even if no records was modified. Else DFW task will be repeated at commit making system tables logically inconsistent.
  • Backport improvement CORE-3536 : Garbage collection in GTT is unnecessary delayed by active transactions in another attachments
    Backport improvement CORE-3537 : There is no need to undo changes made in GTT created with ON COMMIT DELETE ROWS option when transaction is rolled back.
  • Fixed bug CORE-3509 : Alter procedure allows to add the parameter with the same name.
B2_1_Release
  • Backport fix for bug CORE-3515 : Index corruption. Validation put "missing entries" message into firebird.log
  • Backport fix for bug CORE-3468 : Attempt to read after the end of file when nbackup state is stalled
  • Backport fix for bug CORE-3464 : Dirty page could be written without releasing (or downgrading) page lock. It results in "lock denied" or "lock conversion denied" bugcheck
  • Fixed bug CORE-3524 : Compiling stored procedure while in use shutdown database
July 2011

TRUNK
  • Port forward fix for bug CORE-3557 : AV in engine when preparing query against dropping tablePort forward fix for bug CORE-3549 : Database corruption after end of session : page xxx is of wrong type expected 4 found 7
B2_5_Release
  • Fixed bug CORE-3533 : Firebird memory not released (Using superserver)
  • Fixed bug CORE-3557 : AV in engine when preparing query against dropping table
  • Fixed bug CORE-3549 : Database corruption after end of session : page xxx is of wrong type expected 4 found 7
B2_1_Release
  • Backport fix for bug CORE-3557 : AV in engine when preparing query against dropping table
  • Backported fix for bug CORE-3549 : Database corruption after end of session : page xxx is of wrong type expected 4 found 7
  • Fixed bug CORE-3409 : Segmentation Fault after upgrade 2.1.3 -> 2.1.4
B2_0_Release
  • Backport fix for bug CORE-3557 : AV in engine when preparing query against dropping table
August 2011

TRUNK
  • Started research on asyncronous prefetch and multi-block IO support
September 2011

TRUNK
  • Initial implementation of asyncronous prefetch and multyblock IO. Windows only so far. Not committed yet.
  • Port forward fix for bug CORE-3610 : Can insert DUPLICATE keys in UNIQUE index
B2_5_Release
  • Fixed bug CORE-3610 : Can insert DUPLICATE keys in UNIQUE index
Vladyslav Khorsun
Dnetpropetrovsk, Ukraine
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