Add mdbx_drop cli tool

Makefile

@@ -90,6 +90,7 @@ db-tools: mdbx
 	cp ethdb/mdbx/dist/mdbx_dump $(GOBIN)
 	cp ethdb/mdbx/dist/mdbx_load $(GOBIN)
 	cp ethdb/mdbx/dist/mdbx_stat $(GOBIN)
+	cp ethdb/mdbx/dist/mdbx_drop $(GOBIN)
 	@echo "Run \"$(GOBIN)/lmdb_stat -h\" to get info about lmdb file."
 
 mdbx:
@@ -98,7 +99,6 @@ mdbx:
 		&& make clean && make config.h \
 		&& echo '#define MDBX_DEBUG 0' >> config.h \
 		&& echo '#define MDBX_FORCE_ASSERTIONS 0' >> config.h \
-        && echo '#define MDBX_ENABLE_MADVISE 0' >> config.h \
         && echo '#define MDBX_TXN_CHECKOWNER 1' >> config.h \
         && echo '#define MDBX_ENV_CHECKPID 1' >> config.h \
         && echo '#define MDBX_DISABLE_PAGECHECKS 0' >> config.h \

ethdb/kv_mdbx.go

@@ -151,21 +151,20 @@ func (opts MdbxOpts) Open() (KV, error) {
 		// 1/8 is good for transactions with a lot of modifications - to reduce invalidation size.
 		// But TG app now using Batch and etl.Collectors to avoid writing to DB frequently changing data.
 		// It means most of our writes are: APPEND or "single UPSERT per key during transaction"
-		if err = env.SetOption(mdbx.OptSpillMinDenominator, 8); err != nil {
-			return nil, err
-		}
-		//if err = env.SetOption(mdbx.OptSpillMaxDenominator, 0); err != nil {
-		//	return nil, err
-		//}
-		if err = env.SetOption(mdbx.OptTxnDpInitial, 4*1024); err != nil {
-			return nil, err
-		}
-		if err = env.SetOption(mdbx.OptDpReverseLimit, 4*1024); err != nil {
-			return nil, err
-		}
-		if err = env.SetOption(mdbx.OptTxnDpLimit, opts.dirtyListMaxPages); err != nil {
-			return nil, err
-		}
+		/*
+			if err = env.SetOption(mdbx.OptSpillMinDenominator, 8); err != nil {
+				return nil, err
+			}
+			if err = env.SetOption(mdbx.OptTxnDpInitial, 4*1024); err != nil {
+				return nil, err
+			}
+			if err = env.SetOption(mdbx.OptDpReverseLimit, 4*1024); err != nil {
+				return nil, err
+			}
+			if err = env.SetOption(mdbx.OptTxnDpLimit, opts.dirtyListMaxPages); err != nil {
+				return nil, err
+			}
+		*/
 	}
 
 	db := &MdbxKV{

ethdb/mdbx/.gitignore

@@ -11,3 +11,4 @@ mdbx_copy
 mdbx_dump
 mdbx_load
 mdbx_stat
+mdbx_drop

ethdb/mdbx/dist/CMakeLists.txt

@@ -648,7 +648,7 @@ if(MDBX_BUILD_TOOLS)
     set(WINGETOPT_SRC "")
   endif()
 
-  foreach(TOOL mdbx_chk mdbx_copy mdbx_stat mdbx_dump mdbx_load)
+  foreach(TOOL mdbx_chk mdbx_copy mdbx_stat mdbx_dump mdbx_load mdbx_drop)
     add_executable(${TOOL} mdbx.h ${MDBX_SOURCE_DIR}/${TOOL}.c ${WINGETOPT_SRC})
     if(MDBX_C_STANDARD)
       set_target_properties(${TOOL} PROPERTIES
@@ -704,6 +704,7 @@ if(MDBX_BUILD_TOOLS)
     mdbx_copy
     mdbx_dump
     mdbx_load
+    mdbx_drop
     RUNTIME
     DESTINATION ${MDBX_TOOLS_INSTALL_DESTINATION}
     COMPONENT runtime)
@@ -718,6 +719,7 @@ if(MDBX_BUILD_TOOLS)
       "${MDBX_SOURCE_DIR}/man1/mdbx_copy.1"
       "${MDBX_SOURCE_DIR}/man1/mdbx_dump.1"
       "${MDBX_SOURCE_DIR}/man1/mdbx_load.1"
+      "${MDBX_SOURCE_DIR}/man1/mdbx_drop.1"
       DESTINATION ${MDBX_MAN_INSTALL_DESTINATION}
       COMPONENT doc)
   endif()

ethdb/mdbx/dist/ChangeLog.md

@@ -1,7 +1,7 @@
 ChangeLog
 ---------
 
-## v0.9.4 (in development) scheduled at 2021-02-23
+## v0.9.4 (in development) scheduled at 2021-03-18
 
 TODO:
 
@@ -13,7 +13,8 @@ TODO:
 
 Acknowledgements:
 
- - [Alex Sharov](https://github.com/AskAlexSharov) for [mdbx-go](https://github.com/torquem-ch/mdbx-go).
+ - [Alex Sharov](https://github.com/AskAlexSharov) for [mdbx-go](https://github.com/torquem-ch/mdbx-go) and for bug reporting.
+ - [Artem Vorotnikov](https://github.com/vorot93) for bug reporting.
 
 New features:
 
@@ -22,10 +23,19 @@ New features:
    The `MDBX_DISABLE_PAGECHECKS=1` provides a performance boost of about 10% in CRUD scenarios,
    and conjointly with the `MDBX_ENV_CHECKPID=0` and `MDBX_TXN_CHECKOWNER=0` options can yield
    up to 30% more performance compared to LMDB.
+ - Using float point (exponential quantized) representation for internal 16-bit values
+   of grow step and shrink threshold when huge ones (https://github.com/erthink/libmdbx/issues/166).
+   To minimize the impact on compatibility, only the odd values inside the upper half
+   of the range (i.e. 32769..65533) are used for the new representation.
+ - Added the `mdbx_drop` similar to LMDB command-line tool to purge or delete (sub)database(s).
 
 Fixes:
 
  - Fixed performance regression due non-optimal C11 atomics usage (https://github.com/erthink/libmdbx/issues/160).
+ - Fixed "reincarnation" of subDB after it deletion (https://github.com/erthink/libmdbx/issues/168).
+ - Fixed (disallowing) implicit subDB deletion via operations on `@MAIN`'s DBI-handle.
+ - Fixed a crash of `mdbx_env_info_ex()` in case of a call for a non-open environment (https://github.com/erthink/libmdbx/issues/171).
+ - Fixed the selecting/adjustment values inside `mdbx_env_set_geometry()` for implicit out-of-range cases (https://github.com/erthink/libmdbx/issues/170).
 
 
 ## v0.9.3 at 2021-02-02

ethdb/mdbx/dist/GNUmakefile

@@ -57,8 +57,8 @@ SO_SUFFIX  := $(shell $(uname2sosuffix))
 
 HEADERS    := mdbx.h mdbx.h++
 LIBRARIES  := libmdbx.a libmdbx.$(SO_SUFFIX)
-TOOLS      := mdbx_stat mdbx_copy mdbx_dump mdbx_load mdbx_chk
-MANPAGES   := mdbx_stat.1 mdbx_copy.1 mdbx_dump.1 mdbx_load.1 mdbx_chk.1
+TOOLS      := mdbx_stat mdbx_copy mdbx_dump mdbx_load mdbx_chk mdbx_drop
+MANPAGES   := mdbx_stat.1 mdbx_copy.1 mdbx_dump.1 mdbx_load.1 mdbx_chk.1 mdbx_drop.1
 
 .PHONY: mdbx all install clean
 

ethdb/mdbx/dist/VERSION

@@ -1 +1 @@
-0.9.3.12
+0.9.3.40

ethdb/mdbx/dist/man1/mdbx_chk.1

@@ -94,5 +94,6 @@ if no quiet mode was requested.
 .BR mdbx_copy (1),
 .BR mdbx_dump (1),
 .BR mdbx_load (1)
+.BR mdbx_drop (1)
 .SH AUTHOR
 Leonid Yuriev <https://github.com/erthink>

ethdb/mdbx/dist/man1/mdbx_copy.1

@@ -62,6 +62,7 @@ free during copying cannot be reused until the copy is done.
 .BR mdbx_chk (1),
 .BR mdbx_stat (1),
 .BR mdbx_load (1)
+.BR mdbx_drop (1)
 .SH AUTHOR
 Howard Chu of Symas Corporation <http://www.symas.com>,
 Leonid Yuriev <https://github.com/erthink>

ethdb/mdbx/dist/man1/mdbx_drop.1

@@ -0,0 +1,48 @@
+.\" Copyright 2021 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copyright 2014-2021 Howard Chu, Symas Corp. All Rights Reserved.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_DROP 1 "2021-02-02" "MDBX 0.9.3"
+.SH NAME
+mdbx_drop \- MDBX database delete tool
+.SH SYNOPSIS
+.B mdbx_drop
+[\c
+.BR \-V ]
+[\c
+.BR \-d ]
+[\c
+.BI \-s \ subdb\fR]
+[\c
+.BR \-n ]
+.BR \ dbpath
+.SH DESCRIPTION
+The
+.B mdbx_drop
+utility empties or deletes a database in the specified
+environment.
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-d
+Delete the specified database, don't just empty it.
+.TP
+.BR \-s \ subdb
+Operate on a specific subdatabase. If no database is specified, only the main database is dropped.
+.TP
+.BR \-n
+Dump an MDBX database which does not use subdirectories.
+This is legacy option. For now MDBX handles this automatically.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur.
+Errors result in a non-zero exit status and
+a diagnostic message being written to standard error.
+.SH "SEE ALSO"
+.BR mdbx_load (1),
+.BR mdbx_copy (1),
+.BR mdbx_chk (1),
+.BR mdbx_stat (1)
+.SH AUTHOR
+Howard Chu of Symas Corporation <http://www.symas.com>

ethdb/mdbx/dist/man1/mdbx_dump.1

@@ -88,6 +88,7 @@ utility to load the database using the correct comparison functions.
 .BR mdbx_copy (1),
 .BR mdbx_chk (1),
 .BR mdbx_stat (1)
+.BR mdbx_drop (1)
 .SH AUTHOR
 Howard Chu of Symas Corporation <http://www.symas.com>,
 Leonid Yuriev <https://github.com/erthink>

ethdb/mdbx/dist/man1/mdbx_load.1

@@ -99,6 +99,7 @@ a diagnostic message being written to standard error.
 .BR mdbx_chk (1),
 .BR mdbx_stat (1),
 .BR mdbx_copy (1)
+.BR mdbx_drop (1)
 .SH AUTHOR
 Howard Chu of Symas Corporation <http://www.symas.com>,
 Leonid Yuriev <https://github.com/erthink>

ethdb/mdbx/dist/man1/mdbx_stat.1

@@ -73,6 +73,7 @@ a diagnostic message being written to standard error.
 .BR mdbx_copy (1),
 .BR mdbx_dump (1),
 .BR mdbx_load (1)
+.BR mdbx_drop (1)
 .SH AUTHOR
 Howard Chu of Symas Corporation <http://www.symas.com>,
 Leonid Yuriev <https://github.com/erthink>