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MDEV-23497 Make ROW_FORMAT=COMPRESSED read-only by default

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Let us introduce the parameter innodb_read_only_compressed
that is ON by default, making any ROW_FORMAT=COMPRESSED tables
read-only.

I developed the ROW_FORMAT=COMPRESSED format based on
Heikki Tuuri's rough design between 2005 and 2008. It might
have been a good idea back then, but no proper benchmarks were
ever run to validate the design or the implementation.

The format has been more or less obsolete for years.
It limits innodb_page_size to 16384 bytes (the default),
and instant ALTER TABLE is not supported.

This is the first step towards deprecating and removing
write support for ROW_FORMAT=COMPRESSED tables.
This commit is contained in:
Marko Mäkelä
2020-11-10 17:21:16 +02:00
parent c498250888
commit 9bc874a594
65 changed files with 396 additions and 192 deletions
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11
mysql-test/suite/gcol/t/innodb_virtual_blob.test
View File

@@ -5,6 +5,11 @@
--echo # BTR_COPY_BLOB_PREFIX
--echo #
--disable_query_log
SET @save_innodb_read_only_compressed=@@GLOBAL.innodb_read_only_compressed;
SET GLOBAL innodb_read_only_compressed=OFF;
--enable_query_log
CREATE TABLE t1
( f1 int primary key, f2 blob,
f3 blob generated always as (f2))
@@ -12,5 +17,9 @@ CREATE TABLE t1
insert into t1 (f1, f2) values (1, repeat('&', 50000));
alter table t1 add index i1 (f3(200)) ;
alter table t1 row_format=compact;
drop table t1;
--disable_query_log
SET GLOBAL innodb_read_only_compressed=@save_innodb_read_only_compressed;
--enable_query_log
drop table t1;