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If there're multiple row versions in InnoDB, reading one row from PK may have O(N) complexity and reading from secondary keys may have O(N^2) complexity. The problem occurs when there are many pending versions of the same row, meaning that the primary key is the same, but a secondary key is different. The slowdown occurs when the secondary index is traversed. This patch creates a helper class for the function row_sel_get_clust_rec_for_mysql() which can remember and re-use cached_clust_rec & cached_old_vers so that rec_get_offsets() does not need to be called over and over for the clustered record. Corrections by Kevin Lewis <kevin.lewis@oracle.com> MDEV-20341 Unstable innodb.innodb_bug14704286 Removed test that tested the ability of interrupting long query which is not long anymore. |
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| .. | ||
| row0ext.cc | ||
| row0ftsort.cc | ||
| row0import.cc | ||
| row0ins.cc | ||
| row0log.cc | ||
| row0merge.cc | ||
| row0mysql.cc | ||
| row0purge.cc | ||
| row0quiesce.cc | ||
| row0row.cc | ||
| row0sel.cc | ||
| row0trunc.cc | ||
| row0uins.cc | ||
| row0umod.cc | ||
| row0undo.cc | ||
| row0upd.cc | ||
| row0vers.cc | ||