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################################################
Validate binary log transaction compression
option values and ranges
################################################
set @@SESSION.ndb_log_transaction_compression = ON;
ERROR HY000: Variable 'ndb_log_transaction_compression' is a GLOBAL variable and should be set with SET GLOBAL
set @@GLOBAL.ndb_log_transaction_compression = ON;
set @@SESSION.ndb_log_transaction_compression_level_zstd = 1;
ERROR HY000: Variable 'ndb_log_transaction_compression_level_zstd' is a GLOBAL variable and should be set with SET GLOBAL
set @@GLOBAL.ndb_log_transaction_compression_level_zstd = 0;
Warnings:
Warning 1292 Truncated incorrect ndb_log_transaction_compression_level_zstd value: '0'
Truncated to 1
show variables like 'ndb_log_transaction_compression_level_zstd';
Variable_name Value
ndb_log_transaction_compression_level_zstd 1
set @@GLOBAL.ndb_log_transaction_compression_level_zstd = 23;
Warnings:
Warning 1292 Truncated incorrect ndb_log_transaction_compression_level_zstd value: '23'
Truncated to 22
show variables like 'ndb_log_transaction_compression_level_zstd';
Variable_name Value
ndb_log_transaction_compression_level_zstd 22
set @@GLOBAL.ndb_log_transaction_compression = DEFAULT;
set @@GLOBAL.ndb_log_transaction_compression_level_zstd = DEFAULT;
################################################
Case 1: Observe binlog compression in ndbcluster
when ndb_log_transaction_compression = default
################################################
show variables like 'ndb_log_bin';
Variable_name Value
ndb_log_bin ON
show variables like 'ndb_log_transaction_compression';
Variable_name Value
ndb_log_transaction_compression OFF
show variables like 'ndb_log_transaction_compression_level_zstd';
Variable_name Value
ndb_log_transaction_compression_level_zstd 3
create table t1 (a int) engine=ndb;
insert into t1 values (1);
insert into t1 select a+1 from t1;
insert into t1 select a+2 from t1;
include/assert.inc [Number of rows in performance_schema.binary_log_transaction_compression (BINARY, ZSTD) = 0]
################################################
Case 2: Observe binlog compression in ndbcluster
when ndb_log_transaction_compression = ON
################################################
set global ndb_log_transaction_compression = ON;
show global variables like 'ndb_log_transaction_compression';
Variable_name Value
ndb_log_transaction_compression ON
insert into t1 select a+4 from t1;
include/assert.inc [Number of rows in performance_schema.binary_log_transaction_compression (BINARY, ZSTD) = 1]
################################################
Case 3: Observe binlog compression in ndbcluster
when ndb_log_transaction_compression = OFF
################################################
set global ndb_log_transaction_compression = OFF;
show global variables like 'ndb_log_transaction_compression';
Variable_name Value
ndb_log_transaction_compression OFF
insert into t1 select a+8 from t1;
include/assert.inc [Compressed data size remains same.]
include/assert.inc [Uncompressed data size increased.]
TRUNCATE performance_schema.binary_log_transaction_compression_stats;
drop table t1;
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