MySQL 5.0系列の開発が盛んに進んでいるかと思えば、
こちら、 バージョン 5.1 系列の開発も活発です。

先ほど MySQL 5.1.4-alpha が公開されました。

　　http://dev.mysql.com/downloads/

バージョン 5.1 系列は、まだ alphan版です。今後改良が進められていくと考えられますので、最新の情報に真っ先に触れたいユーザは、ぜひお試しください。

なお バージョン 5.1 系列 の Windows 版ではいまのところ、「インストーラなし版」しか公開されていません。インストーラ付きは将来のバージョンでサポートする意向とのことです。

以下チェンジログ。5.1.3との違いは、5.0.17でなされた修正の反映が多くあるように見受けられます。

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■機能の追加と変更
- It is now possible to build the server such that MyISAM tables can support up to 128 keys rather than the standard 64. This can be done by configuring the build using the option --with-max-indexes=N, where N<=128 is the maximum number of indexes to permit per table. (Bug #10932 (http://bugs.mysql.com/10932))

- The bundled BDB library was upgraded to version 4.4.16.

- Added the cp1250_polish_ci collation for the cp1250 character set.

- Added the myisam_use_mmap system variable.

- Added the --bdb-data-direct and --bdb-log-direct server options.


■バグ修正

- BDB: A DELETE, INSERT, or UPDATE of a BDB table could cause the server to crash where the query contained a subquery using an index read. (Bug #15536 (http://bugs.mysql.com/15536))

- A left join on a column that having a NULL value could cause the server to crash. (Bug #15268 (http://bugs.mysql.com/15268))

- It was not possible to reorganize a partition reusing a discarded partition name. Now, for example, you can create a table such as this one: CREATE TABLE t1 (a INT) PARTITION BY RANGE (a) ( PARTITION p0 VALUES LESS THAN (10), PARTITION p1 VALUES LESS THAN (20), PARTITION p2 VALUES LESS THAN MAXVALUE ); and then repartition it as shown here: ALTER TABLE t1 REORGANIZE PARTITION p2 INTO ( PARTITION p2 VALUES LESS THAN (30) ); Previously, attempting to do so would produce the error All partitions must have unique names in the table. (Bug #15521 (http://bugs.mysql.com/15521))

- NDB Cluster: The --ndb option for perror did not function. (Bug #15486 (http://bugs.mysql.com/15486))

- The BLACKHOLE storage engine did not handle transactions properly: Rolled-back transactions were written to the binary log. Now they are not. (Bug #15406 (http://bugs.mysql.com/15406))

- NDB Cluster: Using ORDER BY primary_key_column when selecting from a table having the primary key on a VARCHAR column caused a forced shutdown of the cluster. (Bug #14828 (http://bugs.mysql.com/14828), Bug #15240 (http://bugs.mysql.com/15240), Bug #15682 (http://bugs.mysql.com/15682), Bug #15517 (http://bugs.mysql.com/15517))

- ANALYZE TABLE did not properly update table statistics for a MyISAM table with a FULLTEXT index containing stopwords, so a subsequent ANALYZE TABLE would not recognize the table as having already been analyzed. (Bug #14902 (http://bugs.mysql.com/14902))

- The maximum value of MAX_ROWS was handled incorrectly on 64-bit systems. (Bug #14155 (http://bugs.mysql.com/14155))

- Multiple-table update operations were counting updates and not updated rows. As a result, if a row had several updates it was counted several times for the "rows matched" value but updated only once. (Bug #15028 (http://bugs.mysql.com/15028))

- SELECT queries that began with an opening parenthesis were not being placed in the query cache. (Bug #14652 (http://bugs.mysql.com/14652))

- Space truncation was being ignored when inserting into BINARY or VARBINARY columns. Now space truncation results in a warning, or an error in strict mode. (Bug #14299 (http://bugs.mysql.com/14299))

- Selecting from a view processed with the temptable algorithm caused a server crash if the query cache was enabled. (Bug #15119 (http://bugs.mysql.com/15119))

- Creating a view that referenced a stored function that selected from a view caused a crash upon selection from the view. (Bug #15096 (http://bugs.mysql.com/15096))

- Creating a view within a stored procedure could result in an out of memory error or a server crash. (Bug #14885 (http://bugs.mysql.com/14885))

- SHOW CREATE DATABASE was sometimes refused when the client had privileges for the database. (Bug #9785 (http://bugs.mysql.com/9785))

- mysql ignored the MYSQL_TCP_PORT environment variable. (Bug #5792 (http://bugs.mysql.com/5792))

- ROW_COUNT() returned an incorrect result after EXECUTE of a prepared statement. (Bug #14956 (http://bugs.mysql.com/14956))

- Invalid casts to DATE values now result in a message of Incorrect datetime value, rather than Truncated incorrect datetime value. (Bug #8294 (http://bugs.mysql.com/8294))

- Attempts to assign NULL to a NOT NULL column in strict mode now result in a message of Column 'col_name' cannot be null, rather than Column set to default value; NULL supplied to NOT NULL column 'col_name' at row n. (Bug #11491 (http://bugs.mysql.com/11491))

- For binary string data types, mysqldump --hex-blob produced an illegal output value of 0x rather than ''. (Bug #13318 (http://bugs.mysql.com/13318))

- Some comparisons for the IN() operator were inconsistent with equivalent comparisons for the = operator. (Bug #12612 (http://bugs.mysql.com/12612))


■追加情報

- We have upgraded the compiler suite used to build MySQL on Windows from Visual Studio 6.0 to Visual Studio .Net 2003. This change has become necessary as we have become aware of problems with the old compiler. We are sorry for the inconvenience to those who compile on Windows from source, but had no better choice.

- This compiler change forces a change of the project files, from ".dsp" (Visual Studio 6.0) to ".vcproj" (Visual Studio .Net 2003). The ".dsp" files are no longer maintained, those that are still contained in the source package may be invalid, they will be removed later. This also applies to our current and future versions of the 4.1 and 5.0 release series.

- Currently, in the 5.1 release series we only publish "noinstall" packages for Windows; installer packages will be added in some future version.

- Also, we currently do not create RPM packages of the 5.1 release series. We ask our linux users to use "tar.gz" packages until we later add RPM again.

- For the time being, we only publish "max" binaries of the 5.1 release series. We are currently not doing "debug" builds for publishing.

- The machine we use to build binaries for OpenBSD has been upgraded from version 3.7 to 3.8. This also affects our future versions of other release series.