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* Update copyrights in source tree to 2008.Bruce Momjian2008-01-01
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* pgindent run for 8.3.Bruce Momjian2007-11-15
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* Implement lazy XID allocation: transactions that do not modify any databaseTom Lane2007-09-05
| | | | | | | | | | | | | | | rows will normally never obtain an XID at all. We already did things this way for subtransactions, but this patch extends the concept to top-level transactions. In applications where there are lots of short read-only transactions, this should improve performance noticeably; not so much from removal of the actual XID-assignments, as from reduction of overhead that's driven by the rate of XID consumption. We add a concept of a "virtual transaction ID" so that active transactions can be uniquely identified even if they don't have a regular XID. This is a much lighter-weight concept: uniqueness of VXIDs is only guaranteed over the short term, and no on-disk record is made about them. Florian Pflug, with some editorialization by Tom.
* Support an optional asynchronous commit mode, in which we don't flush WALTom Lane2007-08-01
| | | | | | before reporting a transaction committed. Data consistency is still guaranteed (unlike setting fsync = off), but a crash may lose the effects of the last few transactions. Patch by Simon, some editorialization by Tom.
* Update CVS HEAD for 2007 copyright. Back branches are typically notBruce Momjian2007-01-05
| | | | back-stamped for this.
* Fix recently-understood problems with handling of XID freezing, particularlyTom Lane2006-11-05
| | | | | | | | | | | | | | | in PITR scenarios. We now WAL-log the replacement of old XIDs with FrozenTransactionId, so that such replacement is guaranteed to propagate to PITR slave databases. Also, rather than relying on hint-bit updates to be preserved, pg_clog is not truncated until all instances of an XID are known to have been replaced by FrozenTransactionId. Add new GUC variables and pg_autovacuum columns to allow management of the freezing policy, so that users can trade off the size of pg_clog against the amount of freezing work done. Revise the already-existing code that forces autovacuum of tables approaching the wraparound point to make it more bulletproof; also, revise the autovacuum logic so that anti-wraparound vacuuming is done per-table rather than per-database. initdb forced because of changes in pg_class, pg_database, and pg_autovacuum catalogs. Heikki Linnakangas, Simon Riggs, and Tom Lane.
* pgindent run for 8.2.Bruce Momjian2006-10-04
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* Allow include files to compile own their own.Bruce Momjian2006-07-13
| | | | | | | Strip unused include files out unused include files, and add needed includes to C files. The next step is to remove unused include files in C files.
* Arrange to emit a description of the current XLOG record as error contextTom Lane2006-03-24
| | | | | | | | | when an error occurs during xlog replay. Also, replace the former risky 'write into a fixed-size buffer with no overflow detection' API for XLOG record description routines; use an expansible StringInfo instead. (The latter accounts for most of the patch bulk.) Qingqing Zhou
* Update copyright for 2006. Update scripts.Bruce Momjian2006-03-05
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* Get rid of slru.c's hardwired insistence on a fixed number of slots perTom Lane2005-12-06
| | | | | | | | | SLRU area. The number of slots is still a compile-time constant (someday we might want to change that), but at least it's a different constant for each SLRU area. Increase number of subtrans buffers to 32 based on experimentation with a heavily subtrans-bashing test case, and increase number of multixact member buffers to 16, since it's obviously silly for it not to be at least twice the number of multixact offset buffers.
* Arrange for read-only accesses to SLRU page buffers to take only a sharedTom Lane2005-12-06
| | | | | | | | | | lock, not exclusive, if the desired page is already in memory. This can be demonstrated to be a significant win on the pg_subtrans cache when there is a large window of open transactions. It should be useful for pg_clog as well. I didn't try to make GetMultiXactIdMembers() use the code, as that would have taken some restructuring, and what with the local cache for multixact contents it probably wouldn't really make a difference. Per my recent proposal.
* Clean up representation of SLRU page state. This is the cleaner fixTom Lane2005-11-05
| | | | | for the SLRU race condition that I posted a few days ago, but we decided not to use in 8.1 and older branches.
* Standard pgindent run for 8.1.Bruce Momjian2005-10-15
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* Convert the arithmetic for shared memory size calculation from 'int'Tom Lane2005-08-20
| | | | | | | | | | | to 'Size' (that is, size_t), and install overflow detection checks in it. This allows us to remove the former arbitrary restrictions on NBuffers etc. It won't make any difference in a 32-bit machine, but in a 64-bit machine you could theoretically have terabytes of shared buffers. (How efficiently we could manage 'em remains to be seen.) Similarly, num_temp_buffers, work_mem, and maintenance_work_mem can be set above 2Gb on a 64-bit machine. Original patch from Koichi Suzuki, additional work by moi.
* Improve the checkpoint signaling mechanism so that the bgwriter can tellTom Lane2005-06-30
| | | | | | | | the difference between checkpoints forced due to WAL segment consumption and checkpoints forced for other reasons (such as CREATE DATABASE). Avoid generating 'checkpoints are occurring too frequently' messages when the checkpoint wasn't caused by WAL segment consumption. Per gripe from Chris K-L.
* Modify XLogInsert API to make callers specify whether pages to be backedTom Lane2005-06-06
| | | | | | | | up have the standard layout with unused space between pd_lower and pd_upper. When this is set, XLogInsert will omit the unused space without bothering to scan it to see if it's zero. That saves time in XLogInsert, and also allows reversion of my earlier patch to make PageRepairFragmentation et al explicitly re-zero freed space. Per suggestion by Heikki Linnakangas.
* Remove the mostly-stubbed-out-anyway support routines for WAL UNDO.Tom Lane2005-06-06
| | | | | | That code is never going to be used in the foreseeable future, and where it's more than a stub it's making the redo routines harder to read.
* Tag appropriate files for rc3PostgreSQL Daemon2004-12-31
| | | | | | | | Also performed an initial run through of upgrading our Copyright date to extend to 2005 ... first run here was very simple ... change everything where: grep 1996-2004 && the word 'Copyright' ... scanned through the generated list with 'less' first, and after, to make sure that I only picked up the right entries ...
* Awhile back I added some code to StartupCLOG() to forcibly zero outTom Lane2004-12-22
| | | | | | | | | | the remainder of the current clog page during system startup. While this was a good idea, it turns out the code fails if nextXid is exactly at a page boundary, because we won't have created the "current" clog page yet in that case. Since the page will be correctly zeroed when we execute the first transaction on it, the solution is just to do nothing when exactly at a page boundary. Per trouble report from Dave Hartwig.
* Ensure that the remainder of the current pg_clog page is zeroed duringTom Lane2004-08-30
| | | | startup, just to be sure that there's no leftover junk there.
* Pgindent run for 8.0.Bruce Momjian2004-08-29
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* Update copyright to 2004.Bruce Momjian2004-08-29
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* Rearrange pg_subtrans handling as per recent discussion. pg_subtransTom Lane2004-08-23
| | | | | | | updates are no longer WAL-logged nor even fsync'd; we do not need to, since after a crash no old pg_subtrans data is needed again. We truncate pg_subtrans to RecentGlobalXmin at each checkpoint. slru.c's API is refactored a little bit to separate out the necessary decisions.
* Fix no-longer-correct bit-pushing in TransactionIdSetStatus, per Alvaro.Tom Lane2004-07-03
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* Nested transactions. There is still much left to do, especially on theTom Lane2004-07-01
| | | | | | | performance front, but with feature freeze upon us I think it's time to drive a stake in the ground and say that this will be in 7.5. Alvaro Herrera, with some help from Tom Lane.
* Per previous discussions, get rid of use of sync(2) in favor ofTom Lane2004-05-31
| | | | | | | | | | | | | | | | | explicitly fsync'ing every (non-temp) file we have written since the last checkpoint. In the vast majority of cases, the burden of the fsyncs should fall on the bgwriter process not on backends. (To this end, we assume that an fsync issued by the bgwriter will force out blocks written to the same file by other processes using other file descriptors. Anyone have a problem with that?) This makes the world safe for WIN32, which ain't even got sync(2), and really makes the world safe for Unixen as well, because sync(2) never had the semantics we need: it offers no way to wait for the requested I/O to finish. Along the way, fix a bug I recently introduced in xlog recovery: file truncation replay failed to clear bufmgr buffers for the dropped blocks, which could result in 'PANIC: heap_delete_redo: no block' later on in xlog replay.
* $Header: -> $PostgreSQL Changes ...PostgreSQL Daemon2003-11-29
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* Update copyrights to 2003.Bruce Momjian2003-08-04
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* pgindent run.Bruce Momjian2003-08-04
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* This patch extracts page buffer pooling and the simpleBruce Momjian2003-06-11
| | | | | | | | | | | | | | | | | least-recently-used strategy from clog.c into slru.c. It doesn't change any visible behaviour and passes all regression tests plus a TruncateCLOG test done manually. Apart from refactoring I made a little change to SlruRecentlyUsed, formerly ClogRecentlyUsed: It now skips incrementing lru_counts, if slotno is already the LRU slot, thus saving a few CPU cycles. To make this work, lru_counts are initialised to 1 in SimpleLruInit. SimpleLru will be used by pg_subtrans (part of the nested transactions project), so the main purpose of this patch is to avoid future code duplication. Manfred Koizar
* Handle clog structure in shared memory in exec() case, for Win32.Bruce Momjian2003-05-03
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* Back out last commit --- wrong patch.Bruce Momjian2003-05-02
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* Dump/read non-default GUC values for use by exec'ed backends, for Win32.Bruce Momjian2003-05-02
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* Reorganize clog's error reporting so that PANIC on clog I/O error canTom Lane2003-04-14
| | | | | be reduced to a plain ERROR. Should make it at least a little less painful to deal with data-corruption problems.
* Ensure that before truncating CLOG, we force a checkpoint even if noTom Lane2002-09-26
| | | | | | recent WAL activity has occurred. Without this, it's possible that a later crash might leave tuples on disk with un-updated commit status bits.
* Remove sys/types.h in files that include postgres.h, and hence c.h,Bruce Momjian2002-09-02
| | | | because c.h has sys/types.h.
* Update copyright to 2002.Bruce Momjian2002-06-20
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* Commit to match discussed elog() changes. Only update is that LOG isBruce Momjian2002-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | now just below FATAL in server_min_messages. Added more text to highlight ordering difference between it and client_min_messages. --------------------------------------------------------------------------- REALLYFATAL => PANIC STOP => PANIC New INFO level the prints to client by default New LOG level the prints to server log by default Cause VACUUM information to print only to the client NOTICE => INFO where purely information messages are sent DEBUG => LOG for purely server status messages DEBUG removed, kept as backward compatible DEBUG5, DEBUG4, DEBUG3, DEBUG2, DEBUG1 added DebugLvl removed in favor of new DEBUG[1-5] symbols New server_min_messages GUC parameter with values: DEBUG[5-1], INFO, NOTICE, ERROR, LOG, FATAL, PANIC New client_min_messages GUC parameter with values: DEBUG[5-1], LOG, INFO, NOTICE, ERROR, FATAL, PANIC Server startup now logged with LOG instead of DEBUG Remove debug_level GUC parameter elog() numbers now start at 10 Add test to print error message if older elog() values are passed to elog() Bootstrap mode now has a -d that requires an argument, like postmaster
* Another pgindent run. Fixes enum indenting, and improves #endifBruce Momjian2001-10-28
| | | | spacing. Also adds space for one-line comments.
* Fix a couple of places where lack of parenthesization of a castTom Lane2001-10-25
| | | | | causes pgindent to make weird formatting decisions. Easiest fix seems to be to put in the extra parens...
* pgindent run on all C files. Java run to follow. initdb/regressionBruce Momjian2001-10-25
| | | | tests pass.
* Implement new 'lightweight lock manager' that's intermediate betweenTom Lane2001-09-29
| | | | | | | | | existing lock manager and spinlocks: it understands exclusive vs shared lock but has few other fancy features. Replace most uses of spinlocks with lightweight locks. All remaining uses of spinlocks have very short lock hold times (a few dozen instructions), so tweak spinlock backoff code to work efficiently given this assumption. All per my proposal on pghackers 26-Sep-01.
* Transaction IDs wrap around, per my proposal of 13-Aug-01. MoreTom Lane2001-08-26
| | | | documentation to come, but the code is all here. initdb forced.
* Fix portability problem in new CLOG code, per report from Rene Pijlman.Tom Lane2001-08-25
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* Replace implementation of pg_log as a relation accessed through theTom Lane2001-08-25
buffer manager with 'pg_clog', a specialized access method modeled on pg_xlog. This simplifies startup (don't need to play games to open pg_log; among other things, OverrideTransactionSystem goes away), should improve performance a little, and opens the door to recycling commit log space by removing no-longer-needed segments of the commit log. Actual recycling is not there yet, but I felt I should commit this part separately since it'd still be useful if we chose not to do transaction ID wraparound.
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