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MariaDB 10.5 had finally included memory instrumentation based on those from MySQL 5.7, but with some changes. We have some 270 instruments:
openxs@ao756:~/dbs/5.7$ bin/mysql --socket=/tmp/mariadb.sock -e"select version(), count(*) from performance_schema.setup_instruments where name like 'memory%'" +----------------+----------+
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| version() | count(*) |
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+----------------+----------+
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| 10.5.5-MariaDB | 270 |
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+----------------+----------+
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openxs@ao756:~/dbs/5.7$ bin/mysql --socket=/tmp/mariadb.sock -e"select name from performance_schema.setup_instruments where name like 'memory%' order by name" | more
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name
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memory/csv/blobroot
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memory/csv/row
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memory/csv/tina_set
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memory/csv/TINA_SHARE
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memory/csv/Transparent_file
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memory/innodb/adaptive hash index
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memory/innodb/btr0btr
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memory/innodb/btr0buf
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memory/innodb/btr0bulk
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memory/innodb/btr0cur
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memory/innodb/btr0pcur
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memory/innodb/btr0sea
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memory/innodb/buf0buf
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memory/innodb/buf0dblwr
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memory/innodb/buf0dump
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memory/innodb/buf_buf_pool
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memory/innodb/dict0dict
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memory/innodb/dict0mem
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memory/innodb/dict0stats
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memory/innodb/dict_stats_bg_recalc_pool_t
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memory/innodb/dict_stats_index_map_t
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memory/innodb/dict_stats_n_diff_on_level
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...
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The purpose of some instruments (like "memory/innodb/adaptive hash index") is clear from the name. But others (like "memory/innodb/btr0pcur" or "memory/sql/MPVIO_EXT::auth_info") hardly makes sense to a typical DBA,
As we have differences from MySQL, we can not rely on their (non-existent as far as I can see) documentation. I'd like to ask either to document all/key instruments or to add a DOCUMENATION column to the setup_instruments table explaining the purpose of the instrument as in MySQL 8.0, see https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-instruments-table.html.
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