Bug #30824 | COLUMN_FORMAT=FIXED columns in ROW_FORMAT=DYNAMIC MyISAM tables? | ||
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Submitted: | 5 Sep 2007 10:20 | Modified: | 4 Feb 2009 10:22 |
Reporter: | Serdar S. Kacar | Email Updates: | |
Status: | Verified | Impact on me: | |
Category: | MySQL Server: DDL | Severity: | S4 (Feature request) |
Version: | 5.X | OS: | Any |
Assigned to: | CPU Architecture: | Any | |
Tags: | column_format, myisam, ROW_FORMAT=DYNAMIC |
[5 Sep 2007 10:20]
Serdar S. Kacar
[5 Sep 2007 11:32]
Serdar S. Kacar
If this feature is implemented, besides COLUMN_FORMAT definition part, the following content has to be changed in documents : 14.4. The MyISAM Storage Engine 14.4.3.2. Dynamic Table Characteristics Old: ... You can use OPTIMIZE TABLE or myisamchk -r to defragment a table. If you have fixed-length columns that you access or change frequently in a table that also contains some variable-length columns, it might be a good idea to move the variable-length columns to other tables just to avoid fragmentation. ... New: ... You can use OPTIMIZE TABLE or myisamchk -r to defragment a table. If you have fixed-length columns that you access or change frequently in a table that also contains some variable-length columns, it might be a good idea to move the variable-length columns to other tables just to avoid fragmentation. Alternatively, if the Zero-Value-Compression is the primary source of fragmentation, you can consider COLUMN_FORMAT=FIXED attribute for the fixed-length columns. ...
[4 Feb 2009 10:22]
Susanne Ebrecht
Many thanks for writing a feature request. Our development will discuss this.