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set @is_enable_default = @@global.ndb_index_stat_enable; set @is_enable = 1; set @is_enable = NULL; # is_enable_on=0 is_enable_off=0 # ndb_index_stat_enable - before show global variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON show local variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON # ndb_index_stat_enable - after show global variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON show local variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON create table record_in_range(no int primary key auto_increment, query varchar(256), part_count int, explain_rows int, count_rows int) engine = myisam; CREATE TABLE t1( K INT NOT NULL AUTO_INCREMENT, I INT, J INT, L INT, PRIMARY KEY(K), KEY(I,J), KEY(L) ) ENGINE=ndbcluster partition by key (K) partitions 1; INSERT INTO t1(I,J,L) VALUES (1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5), (6,6,6),(7,7,7),(8,8,8),(9,9,9),(0,0,0); INSERT INTO t1(I,J,L) SELECT I,1,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,2,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,3,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,4,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,5,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,6,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,7,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,8,I FROM t1 ORDER BY K; INSERT INTO t1(I,J,L) SELECT I,9,I FROM t1 ORDER BY K; select i, count(*) from t1 group by 1 order by 1; i count(*) 0 512 1 512 2 512 3 512 4 512 5 512 6 512 7 512 8 512 9 512 select l, count(*) from t1 group by 1 order by 1; l count(*) 0 512 1 512 2 512 3 512 4 512 5 512 6 512 7 512 8 512 9 512 ANALYZE TABLE t1; Table Op Msg_type Msg_text test.t1 analyze status OK Table Op Msg_type Msg_text test.t1 analyze status OK select distinct substring(rr.query from INSTR(rr.query, 'WHERE')) as 'WHERE', count_rows, p1.val as p1_val, if(p8.err_pct is not null and abs(p8.err_pct)<45,'-',p8.val) p8_val, case when p1.err_pct is null then '-' when abs(p1.err_pct)<45 then '<45' else p1.err_pct end p1_err_pct, case when p8.err_pct is null then '-' when abs(p8.err_pct)<45 then '<45' else p8.err_pct end p8_err_pct from record_in_range rr, (select query, explain_rows as val, if(count_rows>0,floor(100*(explain_rows - count_rows) / count_rows),NULL) err_pct from record_in_range p where part_count = 1) p1, (select query, explain_rows as val, if(count_rows>0,floor(100*(explain_rows - count_rows) / count_rows),NULL) err_pct from record_in_range p where part_count = 8) p8 where rr.query = p1.query and rr.query = p8.query order by rr.no; WHERE count_rows p1_val p8_val p1_err_pct p8_err_pct WHERE i = 10 0 2 2 - - WHERE i = 9 512 512 - <45 <45 WHERE i = 8 512 512 - <45 <45 WHERE i = 7 512 512 - <45 <45 WHERE i = 6 512 512 - <45 <45 WHERE i = 5 512 512 - <45 <45 WHERE i = 4 512 512 - <45 <45 WHERE i = 3 512 512 - <45 <45 WHERE i = 2 512 512 - <45 <45 WHERE i = 1 512 512 - <45 <45 WHERE l = 10 0 2 2 - - WHERE l = 9 512 512 - <45 <45 WHERE l = 8 512 512 - <45 <45 WHERE l = 7 512 512 - <45 <45 WHERE l = 6 512 512 - <45 <45 WHERE l = 5 512 512 - <45 <45 WHERE l = 4 512 512 - <45 <45 WHERE l = 3 512 512 - <45 <45 WHERE l = 2 512 512 - <45 <45 WHERE l = 1 512 512 - <45 <45 DROP TABLE t1, record_in_range; End of 5.1 tests set @is_enable = @is_enable_default; set @is_enable = NULL; # is_enable_on=0 is_enable_off=0 # ndb_index_stat_enable - before show global variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON show local variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON # ndb_index_stat_enable - after show global variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON show local variables like 'ndb_index_stat_enable'; Variable_name Value ndb_index_stat_enable ON