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ha_innobase.cc:

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Backport from 4.0: convert TL_READ_NO_INSERT to TL_READ to allow concurrent inserts to the table in INSERT INTO ... SELECT ... FROM table


sql/ha_innobase.cc:
  Backport from 4.0: convert TL_READ_NO_INSERT to TL_READ to allow concurrent inserts to the table in INSERT INTO ... SELECT ... FROM table
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unknown 2003-01-21 00:44:49 +02:00
parent fb466c176b
commit c0dd9d0aa2
1 changed files with 10 additions and 0 deletions
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10
sql/ha_innobase.cc
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@ -3718,6 +3718,16 @@ ha_innobase::store_lock(
lock_type = TL_WRITE_ALLOW_WRITE;
}
/* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
MySQL would use the lock TL_READ_NO_INSERT on t2, and that
would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
to t2. Convert the lock to a normal read lock to allow
concurrent inserts to t2. */
if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables) {
lock_type = TL_READ;
}
lock.type=lock_type;
}